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What is the Sandbox?

This "Sandbox" is a place where Code Golf users can get feedback on prospective challenges they wish to post to the main page. This is useful because writing a clear and fully specified challenge on the first try can be difficult. There is a much better chance of your challenge being well received if you post it in the Sandbox first.

To post to the Sandbox, scroll to the bottom of this page or click on the "Add Proposal" link below, and click "Answer This Question". Click "OK" when it asks if you really want to add another answer. Write your challenge just as you would when actually posting it. You may also add some notes about specific things you would like to clarify before posting it. Other users will help you improve your challenge by rating and discussing it. When you think your challenge is ready for the public, go ahead and post it, replace the post here with a link to the challenge and delete it.

See the Sandbox FAQ for more information on how to use the Sandbox.

The Sandbox works best if you sort posts by "active".

Add Proposal

Search the Sandbox

Browse your pending proposals

Get the Sandbox Viewer to view the sandbox more easily

To add an inline tag to a proposal use shortcut link syntax with a prefix: [tag:king-of-the-hill]

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  • \$\begingroup\$ How are tags added to questions? \$\endgroup\$ – guest271314 Jan 9 at 7:51
  • \$\begingroup\$ @guest271314 You can use this markup to create a tag in a draft: [tag:code-golf] \$\endgroup\$ – DJMcMayhem Aug 29 at 15:19
  • \$\begingroup\$ Why no featured anymore? Can't we have it auto-added or something? \$\endgroup\$ – JL2210 Sep 26 at 15:57
  • 1
    \$\begingroup\$ @JL2210 We now have a permanent info box that links to the Sandbox, so the featured tag isn't necessary \$\endgroup\$ – caird coinheringaahing Sep 29 at 13:43

2615 Answers 2615

0
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Just One More Time

Challenge

Write a program or function that will run without error once, but will crash when run for the second time.

If you are writing a function, you may assume the function will be run twice within the same interpreter session or program.

If you are writing a program, you may assume the machine will not be rebooted between runs.

Scoring

This is , so the shortest answer in each language wins.

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  • \$\begingroup\$ I feel like the function version is much easier than the program version so I don't think you will see many programs in languages that could do both. Take C: i=1;f(){return 1/i--;}. I don't think you could reasonably ban "global" values to prevent this, but it's up to you if you even think this is a bad thing. \$\endgroup\$ – FryAmTheEggman Jun 27 '17 at 1:10
  • \$\begingroup\$ Will it run a third time? \$\endgroup\$ – Okx Jun 27 '17 at 10:16
  • \$\begingroup\$ @FryAmTheEggman The answer you gave is exactly the type I would be looking for \$\endgroup\$ – musicman523 Jun 27 '17 at 15:01
  • \$\begingroup\$ @Okx It would not be run a third time. For functions, the assumption is that the crash would kill the interpreter session/program. For programs, I just won't run it a third time. \$\endgroup\$ – musicman523 Jun 27 '17 at 15:02
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What Tiles did I have?

Everyone should be aware of the scoring system in a classic board game: Scrabble. I remember going back into my old scrabble box and finding some old post-it notes containing old scores. I always wonder what the heck was played for some of the more insane point scores. That gave me the idea for this challenge...


English-language editions of Scrabble contain 100 letter tiles, in the following distribution:

  • 0 points: * x 2 (These are the blank tiles)
  • 1 point: E ×12, A ×9, I ×9, O ×8, N ×6, R ×6, T ×6, L ×4, S ×4, U ×4
  • 2 points: D ×4, G ×3
  • 3 points: B ×2, C ×2, M ×2, P ×2
  • 4 points: F ×2, H ×2, V ×2, W ×2, Y ×2
  • 5 points: K ×1
  • 8 points: J ×1, X ×1
  • 10 points: Q ×1, Z ×1

Your challenge is, given a single integer input between 0 and 185, output a corresponding sequence of scrabble tiles that sum to that score with a length between 2 and 100 characters in length.

The Specifics

  • The letters don't have to spell anything, they just have to sum to that score.
  • You can only use a tile the number of times it exists (E.G. E can be used 12 times).
  • The shortest word is 2 characters long, for an input of 0 you get **.
  • Outputs will not match between answers, as there are many solutions.

Inputs and Outputs

  • Input should be a single integer, anything else is wrong.
  • Output should be a single string, with no spaces, order of letters is arbitrary.

Example (Potential Solution)

0   | **
1   | *E
2   | EE
[... Pattern Omitted ...]
12  | EEEEEEEEEEE
13  | EEEEEEEEEEEA
[... Pattern Omitted ...]
68  | EEEEEEEEEEEEAAAAAAAAAIIIIIIIIIOOOOOOOONNNNNNRRRRRRRTTTTTTLLLLSSSSUUUU
[... Arbitrary Ordering Omitted ...]
185 | EEEEEEEEEEEEAAAAAAAAAIIIIIIIIIOOOOOOOONNNNNNRRRRRRRTTTTTTLLLLSSSSUUUUDDDDGGGBBCCMMPPFFHHVVWWYYKJXZQ

This is ,: Whomever contacts Cthulhu using the dark arts first wins.

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  • \$\begingroup\$ Whomever contacts Cthulhu using the dark arts first wins. that's bait \$\endgroup\$ – Stephen Jun 27 '17 at 20:25
  • \$\begingroup\$ @StephenS wellp, if you want more bait check out 20 of my other random ass winning criterion for my sandboxies. \$\endgroup\$ – Magic Octopus Urn Jun 27 '17 at 20:27
  • \$\begingroup\$ Sorry Sandbox sucks :/ can output be a list of one-char strings? and integer includes negatives, dunno if that's on purpose or not \$\endgroup\$ – Stephen Jun 27 '17 at 20:29
  • \$\begingroup\$ @StephenS nono! That wasn't a diss on you or sandbox! That was just me stating that last 20 submission I've made to the sandbox I've put random winning criterion like "Winner buys dennis a subway footlong, or his countries' equivalent". \$\endgroup\$ – Magic Octopus Urn Jun 27 '17 at 20:35
  • \$\begingroup\$ Also, it says an integer between 0 and 185. Also I mentioned words must be at least 2-chars. I feel like either my challenge's wording blows or you misread it a little. Probably more likely the challenge is worded poorly, I've had 2 already. \$\endgroup\$ – Magic Octopus Urn Jun 27 '17 at 20:35
  • \$\begingroup\$ I made it a diss on Sandbox, that no one noticed them xD and I was looking in the #Input section for all the input specifics - I should have looked at the whole challenge, my bad. I just read Input should be a single integer, anything else is wrong. so that's what I assumed the whole rule for Input was (reading is hard) \$\endgroup\$ – Stephen Jun 27 '17 at 20:37
  • \$\begingroup\$ @StephenS to be honest, reading isn't hard, it's contextual. I always have noticed in my career that I 100% understand anything that I create. Then, when explaining it to others, it may make literally 0 sense but be 100% viable in my head. Then like 10/12 people come forth saying "What the heck did you even try to write man?" And I realize, "what the hell did I even try to write?" Hahaha. The way I explain things to others can be horrifically inadequate by my own experience. \$\endgroup\$ – Magic Octopus Urn Jun 27 '17 at 20:48
  • \$\begingroup\$ Related. It's a borderline dupe, in that the only real difference is a suitable wrapping loop. \$\endgroup\$ – Peter Taylor Jun 27 '17 at 21:42
  • \$\begingroup\$ A standard Scrabble board is 15 x 15, and even a "Super Scrabble" board is only 21 x 21. Should the maximum word length be limited to 15 (instead of 100)? \$\endgroup\$ – Jasper Jun 29 '17 at 5:50
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Display the Undisplayable

I have sometimes seen answers to challenges, written in binary machine code. The users who post them usually display them in hexadecimal representation. This representation makes the code extremely long, and does not do them justice!

Thus, we should give them help, and I don't care if they don't need it. Your task will to write a program/function/eldritch incantation to turn their beautifully golfed binary code into the shortest possible string of printable characters.

Input

A sequence of random binary data of random length. Use any of the standard IO methods (note to self: find the link to the Meta post).

Output

A sequence of printable characters. Use any of the standard IO methods.

  • If encoding is relevant, you are free to choose any encoding, provided you clearly indicate which one you used in your answer. What is relevant is the number of characters anyway.

  • Whitespaces (regular space, new line, non-breaking space, form feed, etc.) are considered not printable. They can be added if you wish, but their presence or absence must not impact the decoding of the output.

Conditions

  • There must exist a program, that can take any possible output of your program, and turn it back into the input (providing it is not needed, but will be smiley'd at).

  • If your program is run twice, with 2 inputs of same size, the 2 resulting outputs must have the same size.

  • Standard loopholes apply.

Score

The score is calcaulated as the number of bytes in the input, divided by the number of characters in the output. The higher the better.

If the score varies depending on the length of the input, take its average over input sizes from 1 to 1024 bytes included (I don't think we'll have answer 1 kb long here).


Giving an answer in a binary language (machine code, LLVM bitcode, etc.) and adding the output when run with its own binary source will be smiley'd at (but no bonus, unless it can also summon Cthulhu).

Don't forget to explain how your code works!


Meta

  • Do you think it's a good idea? Is there already a challenge like this one?
  • Is there any blatant loophole/possible imporvements?
  • What tag(s) do you recommend for this challenge? (please edit the answer)
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  • \$\begingroup\$ @Mr.Xcoder Sorry ^^ \$\endgroup\$ – Nathan.Eilisha Shiraini Jun 28 '17 at 12:43
  • \$\begingroup\$ it's spelled Cthulhu \$\endgroup\$ – Skidsdev Jun 28 '17 at 13:10
  • \$\begingroup\$ @Mayube That was what Mr.Xcoder's deleted comment was about... At first I didn't want to make a trivial edit, but since spelling of culture reference is such an important matter... Fixed! Now maybe I'll get more reactions about the challenge itself ^^ \$\endgroup\$ – Nathan.Eilisha Shiraini Jun 28 '17 at 13:14
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    \$\begingroup\$ I think this needs a precise definition of printable character. Unicode doesn't define the term. But once that's provided this is just a base conversion with an awkward base and every answer should get the optimum score, so the scoring system doesn't work. \$\endgroup\$ – Peter Taylor Jun 28 '17 at 13:51
  • \$\begingroup\$ I just wanted to say thank you for using the sandbox! I hope things go well with your challenges :) That said, I have to agree with Peter Taylor, it seems like every answer will get the optimal score. I think requiring the optimal score and changing to code-golf will work better, but there are many other ways you could fix it. Good luck! \$\endgroup\$ – FryAmTheEggman Jun 28 '17 at 14:03
  • \$\begingroup\$ Worth noting that encoding is always gunna be relevant given non-printables don't count, as bytes 0x00-0x20 are non-printables by your definition, meaning if the given binary contains any of those bytes, ASCII can't be used. \$\endgroup\$ – Skidsdev Jun 28 '17 at 14:06
  • \$\begingroup\$ @FryAmTheEggman I thought about something like that - maybe not the optimal score, but greater than a given value. And it seems I was right to use the sandbox, since there are already 2 potential loopholes detected! \$\endgroup\$ – Nathan.Eilisha Shiraini Jun 28 '17 at 14:08
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Every Nth Line in Source Outputs N

Heavily inspired by Hello, World! (Every other character)

Related to my other Sandbox post Every Nth Char in Source Outputs N; is it a dupe?

Write a program that outputs 1. When the first, third, fifth, etc. lines are removed, it outputs 2. When all lines where their (1-based) index in the source, mod N, are not 0, are removed, it should output N.

This is . The winner is the program that works with the largest N, while working for all n < N (obviously, to run up to N, it has to be at least N lines long). If there is a tie, the winner is the shortest answer that reaches the largest N. Your program must at least work up to N=2, since I don't think any languages will struggle with simply printing 1.

Example

Examples are based off of this sample program:

test
hi
world
hello
12345
System.out.println(test);
timeout
let's dance

For the program to work for N=1, the original program should output 1.

For the program to work for N=2, the following should output 2:

hi
hello
System.out.println(test);
let's dance

For the program to work for N=3, the following should output 3:

world
System.out.println(test);

For the program to work for N=4, the following should output 4:

hello
let's dance

For the program to work for N=5, the following should output 5:

12345

etc.

The highest N this program could work for is its line length, 8.

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Sandboxing this mostly so I don't forget about it (as I don't want to initiate this so soon after v3). Unlikely to need any serious revision, but comments are appreciated none the less.

Prisoner's Dilemma v4: The Amnesiac Gentlemen.

This is similar to v3 Petri Dilemma, except with one significant change: no one knows what round it is. The same setup, submission format, and scoring will be used. For sandbox brevity, I'm only noting the differences from v3.

Bots will receive input at the beginning of its turn in the format:

current points, enemies points, your previous moves, enemy's previous moves

The format of the move list (both yours and the enemy's) will be a string of characters, "c" for cooperation "d" for defection, in order from first round to last. However this list will contain only the first seven moves of the game as well as the most recent 7 moves (as everyone knows, you can only hold seven items in working memory). A String 14 characters or fewer would indicate a round at the beginning of the game where 14 total moves haven't yet been performed. Later rounds would be indeterminate.

Additionally, as the current round number is not being passed in, bots will be unaware of when the end of the game comes (games will still be 200 rounds). This should prevent "Ah ha, last round, I backstab!" "Ah ha, but I backstab you first, one round earlier!" strategies, which is what dominated a large swath of the v3 strategic playspace (I did tests where all backstab-early bots were coded to all backstab on the same round and there were only two that performed sub-optimally as a result, both of which were set to backstab "before all n-Tit-for-Tat strategies", moving them back 1 rounds re-elevated them above n-Tit-for-Tat again, as well as which one backstabbed the other first determining the winner between them). While several bots from v3 would be valid submissions in v4, all of the winning bots utilize more data than v4 will let them have, opening up the playing field for new techniques.

Here are four sample strategies that will be entered to start with:

Tit for Tat

def titfortatfunc(mypoints, enpoints, mylist, enlist):
    if not enlist or enlist[counter-1] == "c":
        return "c"
    else:
        return "d"

RandomPick

from random import choice
def randompickfunc(mypoints, enpoints, mylist, enlist):
    return choice(["d", "c"])

Cooperator

def cooperatorfunc(mypoints, enpoints, mylist, enlist):
    return "c"

Defector

def defectorfunc(mypoints, enpoints, mylist, enlist):
    return "d"
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(Code Golf) How Many Notes Are There?

Background

Most music games (MUG) describes the "instructions" that the player must follow as "notes". When the charts (set of notes) are first available, MUG players usually record the chart as a video and upload them to video sites. However, unless playing a full combo (able to pick up all notes) that the combo count directly shows the number of notes, it is usually not practical to count the number of notes one by one directly (since there are usually hundreds of notes), so they calculate that from the scores that may show on those videos if the score formula is known.

One of those examples is jubeat, which is somehow like a MUG version of "Whack-a-Mole". Although officially "instructions" are called "chips", players have the consensus to call them "notes". (For those who don't know what jubeat is please check it out here: jubeat - RemyWiki)

Objective

What you have to do, is to:

  • Write a program or function,
  • Which accepts a list of integers as the only input,
  • That calculates the numbers of notes which is possible for all the given "basic scores".

Requirements

  • The input can be an array of integers or a string containing those integers (Please indicate the input format).
  • The integers in the input are guaranteed to be in the range of [0, 900000] inclusive.
  • A case (NOTES in the formula) is possible means that, for each integer in the input, there exists a variable ACH, when substituted into the formula below, the formula evaluates to that integer. (See The Formula and Test Cases for details)
  • All possible cases within the range [1, 1100] inclusive must be included in the output.
  • The output can be an array of integers or a string containing the results (Please indicate the output format).
  • If there is no case fulfilling the requirements, the program or function should either return an empty array, an empty string, null, or any objects indicating absence of results.
  • NO RUNTIME EXCEPTIONS shall be thrown in any circumstances.

The Formula

The max score is 1000000, but here we only consider BASIC_SCORE, whose maximum is 900000.

The BASIC_SCORE is calculated by BASIC_SCORE = floor(floor(ACH * 100000 / NOTES) * 0.9), where ACH is an integer in the range [0, NOTES*10] inclusive except NOTES*10-1 and NOTES*10-2.

As a concrete example, take ACH=6850, NOTES=900, we have BASIC_SCORE = floor(floor(6850 * 100000 / 900) * 0.9) = 684999.

As a result, NOTES=900 is a possible case for the basic score 684999.

Test cases

 Input                                    | Output
-----------------------------------------------------------------------------------------
 896757, 846353, 844486                   | 916
 891000, 893999                           | (all multiples of 30 within [1, 1100])
 899736                                   | 1024, 1025, 1026, 1027
                                          | (342, 683, 684 are false positives because  
                                          |  in these cases ACH = NOTES*10-1 or 
                                          |  ACH = NOTES*10-2)
 873540, 802468                           | (none: no case fits all inputs.
                                          |  some cases do fit some inputs but not all)
 0, 900000                                | (all values within [1..1100])
 800000                                   | (none)

Rules and Winning Criteria

This is a , so the source code with the shortest length (in terms of bytes) wins. Standard loopholes apply.

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Poor Man's Ransomware

This challenge is loosely inspired by the cheapo-enigma machine question. However, I beleive that the differences are substantial enough that this would not be a dupe. Feedback welcome.


You have been captured by a morally questionable "employer" and forced to write a piece of "ransomware". All it has to do is take in a string "in whatever format" and output another string (which can be used to recover the files) Essentially, across the set of all possible inputs (infinite) you will define a one to one function.

Participants will then publish their code to stack-exchange, where other aspiring "hackers" will try to break your code. A "cop" submission will consist of a byte count a sample plaintext and a sample "encrypted" file as well as an encrypted copy of your code.

Robbers will work tirelessly in another thread to reproduce your code. Any submission which correctly produces the corresponding "encrypted" files when fed the sample plaintext and itself will be considered to be cracked.

If your code lasts 7 days or longer you may mark your submission as "safe" by publishing the source code for the encryptor and a decryptor. Until this time robbers may still work to break your code. If anyone finds that a specific decryptor fails on a certain plaintext it is invalid.

The winning cop has the shortest safe submission and the winning robber has the largest sum of the bytes of his cracked cops. Ties go to the earlier poster. Good Luck!

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  • \$\begingroup\$ I'm not sure how much of the history of cops-and-robbers you are aware of. In the early days it was almost killed off as an interesting challenge type precisely by crypto, because it's so easy to make a problem which depends on e.g. factoring a large prime. In some senses this would be a duplicate of the very first cops-and-robbers. \$\endgroup\$ – Peter Taylor Jun 30 '17 at 20:07
  • \$\begingroup\$ Almost every cnr problem can be solved using cryptography. Would you then say that almost every cops and robbers problem is dupe of the other ones? \$\endgroup\$ – Rohan Jhunjhunwala Jun 30 '17 at 20:41
  • \$\begingroup\$ Many cnr's now try to ban the use of cryptography precisely to avoid this problem. \$\endgroup\$ – Peter Taylor Jun 30 '17 at 20:55
  • \$\begingroup\$ @PeterTaylor could I ban Crypto built ins? \$\endgroup\$ – Rohan Jhunjhunwala Jun 30 '17 at 21:32
  • \$\begingroup\$ What would be the point? It's crypto that's the problem, not crypto built-ins. \$\endgroup\$ – Peter Taylor Jun 30 '17 at 21:45
  • \$\begingroup\$ Maybe it might not be that bad of a thing? \$\endgroup\$ – Rohan Jhunjhunwala Jun 30 '17 at 21:57
  • \$\begingroup\$ I tmight be worth asking about this somewhere \$\endgroup\$ – Rohan Jhunjhunwala Jun 30 '17 at 21:57
  • \$\begingroup\$ It would be easy to implement some simple crypto and hardcode a key, making it impossible for robbers. \$\endgroup\$ – Shelvacu Jul 1 '17 at 23:39
  • \$\begingroup\$ Isn't that what most cnr challenges center on? \$\endgroup\$ – Rohan Jhunjhunwala Jul 2 '17 at 0:30
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Count bytes like a Java golfer

Java is verbose, everybody knows that. Sometimes, here on PPCG, it happens that a Java answer is shorter than 60 characters, but most of the time it's longer, way longer! And the Java golfers here often post improvement suggestions in comments.

Alas, the PPCG website is based on the stack software, which invisibly cuts <code> comments according to an obscure rule, which I shall name the "Java golfer's bane", making it impossible to get an accurate byte-count by copy-pasting.

The rule in question is the following:

  • in a <code> tag, insert two invisible characters
    • the first time after 60 non-whitespace consecutive characters
    • then subsequently ever 20 non-whitespace consecutive characters

Challenge

Your goal is to help us, poor Java golfers, to get the byte-count straight from when we copy/paste code from comments.

SE software rules are, I'm sure, complex, so we will simplify a bit, but not that much.

  • Your input:
    • is mappable to UTF-8;
    • must support codepoints until at least U+FFFF;
    • will contain only characters with codepoints greater than or equal to U+0020;
    • must be a string or a characters array/list if those accept unicode characters, or else must be an integer (16 bits minimum) array/list. Unless I forgot anything obvious, no other input format is allowed.
  • If a sequence of non-whitespace characters in the input contains more than 60 characters:
    • keep the 60 first characters, then skip the next 2 characters;
    • then until you meet a whitespace, keep the next 20 characters and skip the next 2.
    • We don't care which are the two stripped characters.
  • Your output is the size of the string after being sanitized, in bytes as encoded in UTF-8! You must support very long Java answers, up to 500 characters (not bytes).
    • You don't need to map to UTF-8 since I give the rule on how to count without mapping, but in some languages it might be easier to actually map!
  • The standard loopholes are naturally forbidden.
  • This is codegolf, so the shortest answer in bytes wins!

You may assume the following:

  • the only whitespace character you will ever get is the space (U+0020). I abuse the term whitespace by including the start of the string as well in its meaning.
  • no whitespace will be at positions 62, 94, 116, (+22) ... after the previous whitespace

You may not assume the following:

  • The skippable characters will exclusively be the ones SE actually uses (U+200C U+200B);
  • you will get only ASCII characters;
  • you will not get any diacritics.

Bonus

  • if your code supports Unicode code points up to U+1FFFFF, you can remove 10% off your byte count, do not round the resut.

How to count the number of UTF-8 bytes?

If you haven't a builtin for that, Wikipedia gives us the rule, based on code points:

first code point  |  last code point  |  # bytes
U+0000            |  U+007F           |  1
U+0080            |  U+07FF           |  2
U+0800            |  U+FFFF           |  3
U+10000           |  U+1FFFFF         |  4

Wikipedia goes beyond those number, but the RFC 3629 capped this mapping to 4 bytes, so we thank it!

Test cases

Work in progress!


Notes for review:

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0
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What feedback do you have for me?

Challenge

Convert and print out a time in a 12-hour format. HH:MM AM/PM

Examples

Input:

  • 'Fri Jun 30 2017 21:14:20 GMT-0700 (PDT)'
  • 'Sat Jun 31 2018 08:06:20 GMT-0700 (PDT)'
  • 'Fri Jul 01 2017 01:14:20 GMT-0700 (PDT)'
  • 'Sat Apr 10 2020 09:06:20 GMT-0700 (PDT)'

Ouput:

  • 09:14 PM
  • 08:06 AM
  • 01:14 AM
  • 09:06 AM

Rules

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  • \$\begingroup\$ I think this question has been covered pretty thoroughly by this challenge and this one, and would probably be closed as a dupe. \$\endgroup\$ – musicman523 Jul 1 '17 at 1:20
  • \$\begingroup\$ did not realize it had already been done :( \$\endgroup\$ – zoecarver Jul 1 '17 at 1:22
  • \$\begingroup\$ It's not exactly the same question, but I think that area has been pretty much covered. Now, what you could do is use this question as a model, but go from 24-hour time to 12-hour time :) \$\endgroup\$ – musicman523 Jul 1 '17 at 1:28
  • 1
    \$\begingroup\$ I like that Idea! in fact I could take it a step further and convert a string in the following format: 2017-07-01T02:58:38.799Z to 12 hour time \$\endgroup\$ – zoecarver Jul 1 '17 at 2:58
  • \$\begingroup\$ @musicman523 I made an edit to the question, what do you think? \$\endgroup\$ – zoecarver Jul 1 '17 at 4:16
  • \$\begingroup\$ I definitely like this better. You should add more test cases with different days (for example, does 1 come out as 1 or 01?), months, days of the week, etc. so there is no confusion about the input format \$\endgroup\$ – musicman523 Jul 1 '17 at 4:27
  • \$\begingroup\$ ok, sounds good. Is that enough test cases? feel free to edit and add more details. \$\endgroup\$ – zoecarver Jul 1 '17 at 4:28
  • \$\begingroup\$ I feel like the testcases should be formatted like input -> output\ninput -> output. What about the midday and midnight? \$\endgroup\$ – NieDzejkob Jul 2 '17 at 17:53
  • \$\begingroup\$ Ok, Sounds good. I am posting it. \$\endgroup\$ – zoecarver Jul 2 '17 at 23:12
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Help! My code has exploded!

Insert backstory here

Task:

Your task is to create a program, which must follow these rules:

  • It must be able to be split exactly into pieces of the same length in bytes.
  • Once you have separated your program into pieces, your program must print 1 if the first "piece" is removed from your code, 2 if the second "piece" is removed, etc., until the program prints n if the nth piece is removed.

For example, if your program was the following:

aabbccdd

And it could be split into 4 equal parts of length 2, then these programs must result in the following outputs:

bbccdd -> 1 (aa is removed)
aaccdd -> 2 (bb is removed)
aabbdd -> 3 (cc is removed)
aabbcc -> 4 (dd is removed)

Scoring requirements:

Your program is scored based on the number of parts that it can be split into, with each part following the rules defined above. The more parts, the higher the score.

In the event of a tie, there is a "hierarchy" of scoring methods (with the next method in the list being used when there is a tie):

  • Number of parts the program can be split equally into
  • Size of the full program, in bytes (shortest byte-count wins)
  • Time posted (first poster wins)

Rules:

  • Each byte in the program must belong to one part.
  • Each part in the program must be of equal length.
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  • \$\begingroup\$ You can make arbitrarily long programs that do this. I suggest instead that each answer should describe a pattern that can go to infinity (with possibly a starting piece). However scoring is difficult, since I forsee that some answers will have the segment number within each segment, meaning that going from 99 segments to 100 segments may require more characters per segment. \$\endgroup\$ – Shelvacu Jul 1 '17 at 20:02
  • \$\begingroup\$ Proof of concept for arbitrary number of segments: gist.github.com/shelvacu/e04c237ad8d1c066a7fd8b5170261e25 However, that was still fun to make so I definitely think there's potential here. \$\endgroup\$ – Shelvacu Jul 1 '17 at 20:13
  • \$\begingroup\$ @Shelvacu That seems like a really cool idea, yeah. Will change my question. \$\endgroup\$ – clismique Jul 1 '17 at 23:12
  • \$\begingroup\$ @Shelvacu Hmmm, I'm not sure how to properly make this into a challenge, TBH. I might scrap it. EDIT: I might have an idea, but I need to completely rewrite it. I might just delete this whole thing. \$\endgroup\$ – clismique Jul 3 '17 at 8:26
  • \$\begingroup\$ If you don't want to post it I will. Keep me posted. \$\endgroup\$ – Shelvacu Jul 3 '17 at 22:14
0
\$\begingroup\$

Introduction

Ten years ago, a secret encryption key used by DVD players was published online. When the industry tried to censor it, the internet reacted by republishing it widely—creatively incorporating the key onto shirts, a flag and even in song.

If this code golf community had existed, I'm sure we would have joined in.

Challenge

Output the number 13256278887989457651018865901401704640.

Example input and output

Input:

Not applicable.

Output:

13256278887989457651018865901401704640

\$\endgroup\$
  • \$\begingroup\$ This is code-golf I suppose, you should mention the winning condition. \$\endgroup\$ – officialaimm Jul 3 '17 at 17:42
  • \$\begingroup\$ Is there any reason to believe that there's any way to compress this other than base conversion? \$\endgroup\$ – Peter Taylor Jul 4 '17 at 7:40
0
\$\begingroup\$

Decode Reddit's Voting System

Background

Users with a high enough reputation on Stack Exchange can see the number of upvotes and downvotes on each question and answer. On Reddit, however, the net vote count and percentage of upvotes are displayed. Unfortunately due to rounding errors, it is impossible to determine exactly how many upvotes and downvotes occurred.

Challenge

Given a nonzero net vote count and a percentage of upvotes, return all possible pairs of the numbers of upvotes and downvotes.

Constraints

The net vote count can be any integer in the range [-2^31, 2^31).

The percentage can be a whole number in the range [0, 100], or a floating point number in the range [0, 1] with no more than two digits; you may decide which format to accept.

The percentage represents the percentage of votes which are upvotes, rounded to the nearest integer. So a value of 93% could be anywhere in the range [92.5%, 93.5%) that would result

The maximum numbers of upvotes and downvotes will not fall outside the range [-2^31, 2^31); that is, you should be safe using 32-bit signed integers.

You may not return two ranges representing all possible amounts of downvotes and upvotes; you must specify which numbers of upvotes correspond to which numbers of downvotes; hence you must return all possible pairs.

Test Cases

1, 67%  -> [(2, 1)]
1, 100% -> [(1, 0)]
1, 60%  -> [(3, 2)]
0, 50%  -> [(0, 0), (1, 1), (2, 2), ...]; cases like this will not be valid input
More involved ones to come...

Meta

Anything I can do to make this more clear or more fun?

\$\endgroup\$
  • 2
    \$\begingroup\$ 1. Does "net vote count" mean upvotes minus downvotes? 2. The listed input 0, 100% is a special case ((0-0)/(0+0) = NaN% or a division by zero exception) so it should be mentioned explicitly in the spec, not just added as a test case. 3. Input 0, 50% would have 2^31 valid outputs, so that should also get an explicit mention because of the potential for answers to fail due to array size limits etc. Combined with point 2, I would suggest editing the question to guarantee that the net vote count will never be 0. \$\endgroup\$ – Peter Taylor Jul 4 '17 at 7:38
  • \$\begingroup\$ "Unfortunately due to rounding errors, it is impossible to determine exactly how many upvotes and downvotes occurred." I was under the impression that reddit adds some random noise to the net votes (not sure about the percentage) to throw off bots or something. \$\endgroup\$ – Martin Ender Jul 4 '17 at 9:52
  • \$\begingroup\$ @PeterTaylor Thank you, updated \$\endgroup\$ – musicman523 Jul 4 '17 at 19:33
  • \$\begingroup\$ @MartinEnder I believe they simply stop reporting exact values after it reaches a certain threshold, but I'm not sure. For this challenge we'll assume they don't add any noise \$\endgroup\$ – musicman523 Jul 4 '17 at 19:34
0
\$\begingroup\$

Create The Correct Path

Which would be better code golf with shortest code and being able to run on at least two operating systems or code challenge and scoring by how many operating systems it can run on?

( OR )

Given an input create a program that when ran on different operating systems creates a path for each one. For example, when ran on Windows:

[ "folder1", "folder2" ] -> folder1\folder2

Input

An array of strings or any suitable alternative. The input can be empty, in which case you would just return an empty string.

Output

The correct path for the operating system the program has been ran on.

\$\endgroup\$
  • \$\begingroup\$ I'm mainly looking at feedback for what people think of this challenge before developing it further. \$\endgroup\$ – TheLethalCoder Jul 5 '17 at 10:16
  • \$\begingroup\$ I think you should include other operating systems with different paths separators in the challenge itself. \$\endgroup\$ – Kritixi Lithos Jul 6 '17 at 8:45
  • \$\begingroup\$ @KritixiLithos I was going to, was waiting to see if I should go with code-golf or code-challenge before writing up the formatting for all the examples. \$\endgroup\$ – TheLethalCoder Jul 6 '17 at 9:02
0
\$\begingroup\$

Draw a Probability Road

Background

I'm conducting a probability experiment. I have a collection of live rats, and I'm going to assign each rat a probability as a percentage integer from 1 to 99 (inclusive). The experiment will last 10 weeks, and at the end of each week, I'll roll a 100-sided die. Any rats who have a higher or equal probability than the number I roll, I kill.

Now of course I'd rather not go actually killing rats, so I want to write a program to create a probability road to show the probability of a rat surviving, when given that rat's probability number.

Unfortunately my lab is full of rats, so I don't have much room to write this program. As a result it needs to be as short as possible in order to fit in my cramped room.

The Challenge

Given an integer 0 < x < 100, output an ASCII Art probability road that shows the rat's chances of surviving.

Input can be taken as an integer, a string, an array of digits or an array of characters.

Output (detailed below) should be either printed/outputted, or returned as a single string (not an array of strings)

But what is a probability road?

A probability road is a type of probability chart used for displaying all possible outcomes of a given event. It consists of a series of lanes, each lane being one possible outcome, and the vertical axis representing time.

For our ASCII art challenge, we want each lane to be a space with a pipe on either side, like so:

| |
| |
| |

However 2 neighbouring lanes should share a pipe, like so:

| | | |
| | | |
| | | |

Every 2 lines of ASCII art represents one week of the experiment, and at each week, a number of lanes corresponding to the probability given should be terminated. A terminated lane ends in an X like so:

| | |
| | |X
| | | |

The lanes should be ordered with the longest lanes on the left, in descending order to the right, and the number of lanes in your probability road should be the fewest possible to accurately represent the given probability, for example given a probability of 50 (50%), the road would look like this:

| | | | | | | | | | |X - Week 10
| | | | | | | | | | | |
| | | | | | | | | | | |X - Week 9
| | | | | | | | | | | | |
| | | | | | | | | | | | |X - Week 8
| | | | | | | | | | | | | |
| | | | | | | | | | | | | |X - Week 7
| | | | | | | | | | | | | | |
| | | | | | | | | | | | | | |X - Week 6
| | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | |X - Week 5
| | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | |X - Week 4
| | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | |X - Week 3
| | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | |X - Week 2
| | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | |X - Week 1
| | | | | | | | | | | | | | | | | | | | |

Given the probability of 50%, half of the lanes should succeed past week 10, while each week, 5% of the total lanes should be eliminated. This could be displayed using 1000 lanes (as could every probability from 1-99), by terminating 50 each week and having 500 reach the end, however this is not the most simplified form of the chart, so doing so would not be valid for this challenge.

Note that the Week X labels are not necessary

Another example, this time for the input 80:

| | | | | |X X
| | | | | | | |
| | | | | | | |X X
| | | | | | | | | |
| | | | | | | | | |X X
| | | | | | | | | | | |
| | | | | | | | | | | |X X
| | | | | | | | | | | | | |
| | | | | | | | | | | | | |X X
| | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | |X X
| | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | |X X
| | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | |X X
| | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | |X X
| | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | |X X
| | | | | | | | | | | | | | | | | | | | | | | | | |

This time, there are 25 lanes. Each week, 2 (8%) are terminated, and 5 (20%) make it to the end.

Rules

Standard loopholes apply, shortest code (in bytes, per language) wins.

As per usual, trailing whitespace is allowed. You may have trailing spaces at the end of lines, and one or more trailing newlines at the end of the output.

Meta

How can I make the explanation clearer? It seems difficult to understand currently.

Also is there anything else that needs specifying or clarifying?

\$\endgroup\$
0
\$\begingroup\$

If you've come here, you probably know what is, and that's what I'm going to assume.

Story

(I guess)


Keyboards are input devices we use all the time. They existed before mice and touch screen, etc.

Their fundamentals have not changed: when you press a key down, a signal is sent to the computer. When you release it, another signal is sent.

So here's the challenge: calculate the minimum number of signals(length of a signal does not matter) depending on the input string.

Example:

Input:

test

Output:

8

Explanation: All keys have to be pressed down and released


Input2:

TEst

Output2:

10

Explanation: Shift has to be pressed, then T, down, up, E, down, up, then release shift, then s down, up, then t down, up, totalling up to 10.


Rules

Any language is accepted.
This is , so shortest code in bytes wins.
Programs with incorrect outputs will be disqualified.

Happy golfing!

Edit:

The keyboard layout used should be this: http://dry.sailingissues.com/keyboard-US-International.png

Only characters in this keyboard layout will be used (+lowercase letters).

Using Caps-Lock is ok, since it DOES have an advantage: numbers remain numbers while letters become uppercase.

Thanks for the feedback so far.

\$\endgroup\$
  • \$\begingroup\$ I think this might be a dupe, lemme see if I can find the original. EDIT: Ah, it's your challenege. I suggest deleting it from main while you work on it here; you can edit and then undelete it when it's ready. \$\endgroup\$ – Shaggy Jul 6 '17 at 9:10
  • \$\begingroup\$ Test cases? Your comment about caps lock is a good example of an edge case which should be explicitly covered by the test cases, and implies another where a shift covers a substring which mixes upper-case letters and symbols. \$\endgroup\$ – Peter Taylor Jul 6 '17 at 10:24
0
\$\begingroup\$

Abbreviate a rename

After you commit a rename, git reminds you but tries to avoid showing the full source and target path. It does this by splitting the path into components, extracting identical leading and trailing components, then using them to abbreviate the rename. (Other output that git produces is not relevant here.) Here is an example:

foo/bar/baz/quux.c => foo/baz/bar/quux.c

The leading component foo and trailing component quux.c is the same, so this becomes

foo/{bar/baz => baz/bar}/quux.c

This also works when one of the components is empty, e.g.:

foo/{bar/baz => }/quux.c
foo/{ => baz/bar}/quux.c

Please write a program or function that abbreviates a rename. The input can be a pair of strings or a single string with a delimiter which can be => or newline or something else not typically found in a file name. The output should be a single string containing a => as shown. You can assume that neither string is a prefix of the other (git doesn't abbreviate the rename in that case for some reason.)

This is , so the shortest program wins!

\$\endgroup\$
0
\$\begingroup\$

Lazy programmers need help versioning!

So here's a question, which is related to a recent problem I had while doing some data processing. I think it is good practice to include version numbers in file names to prevent data being overwritten and so you can see how things have changed with each version but I'm lazy so want it automating!

Your challenge

Take a full Windows file path and either increment the file version, or if there is no version, make it version 1.

Input

A full Windows file path, that includes the file extension.

Output

The original file path with the file version, incremented appropriately.

Rules

  • The version is determined by an underscore followed by a single digit, i.e _1 for version 1.
  • For a file that already have a version, it will only be in the range 1-8, so you only ever have to deal with single digit file versions.
  • Standard rules apply
  • Default Loopholes are forbidden.
  • Please provide explanations of your code so others can learn form it and if possible, links to an online interpreter such as TIO
  • This is so shortest code in bytes wins!

Test cases

Case 1
Input:  C:\Foo\Bar.txt
Output: C:\Foo\Bar_1.txt

Case 2
Input:  C:\notsortedfile_version_1_new_5.docx
Output: C:\notsortedfile_version_1_new_6.docx

Case 3
Input:  D:\a\very\deep\file\567234.pdf
Output: D:\a\very\deep\file\567234_1.pdf

Case 4
Input:  Z:\Storage\Somefile_2017-04-11.txt
Output: Z:\Storage\Somefile_2017-04-11_1.txt

Case 5
Input:  Z:\Storage\I.Like.Dots.txt
Output: Z:\Storage\I.Like.Dots_1.txt

Sandbox Questions

Not sure if this is dupe of Please release me!

Any feedback welcome.

\$\endgroup\$
  • \$\begingroup\$ I don't think it's a dupe. My opinions: You shouldn't let the test cases be dependent on OS. Just stick with one, the challenge is to modify a string, it doesn't really depend on which OS you're on. Personlly, I'd skip the 1-8 limitation. I think it would be more fun to go from file_9 to file_10. People (including you) might disagree with me though. \$\endgroup\$ – Stewie Griffin Apr 11 '17 at 8:51
  • 1
    \$\begingroup\$ Also, I though version control was handled this way: filename.xyz -> filename_new.xyz -> filename_new_1.xyz (remember to rename the previous to: filename_new_OLD.xyz). And of course versions such as filename_new_2_backup.xyz, filename_final_version.xyz -> filename_final_version_2.xyz. \$\endgroup\$ – Stewie Griffin Apr 11 '17 at 8:56
  • \$\begingroup\$ Which is why need to get some code to do it for us :) \$\endgroup\$ – Notts90 Apr 11 '17 at 8:58
  • \$\begingroup\$ Will file names only ever contain a .? \$\endgroup\$ – Shaggy Jul 6 '17 at 11:19
  • \$\begingroup\$ @Shaggy It could be any valid windows file path so yes, I've added a test case to cover it. \$\endgroup\$ – Notts90 Jul 6 '17 at 11:26
  • \$\begingroup\$ Test case: c:\foo? \$\endgroup\$ – Peter Taylor Jul 6 '17 at 13:32
0
\$\begingroup\$

The task

Your code should take in an integer 0 < x < 1965593254291461501637330902918203684832716283083 and output the smallest integer m such that x^m mod 1965593254291461501637330902918203684832716283083 = 1. This long number is the next prime after 2^100 so can be encoded efficiently.

You may take the input in any format that is convenient and output in any convenient form too.

Your code should take less then one minute to run on a standard desktop no matter what the input.

Examples

2, 4235851503548771316711413838489497242205033676
3, 16943406014195085266845655353957988968820134704
169434060141950852668456553539579889688, 16943406014195085266845655353957988968820134704

Those with python or similar can check the answers with e.g. pow(3,16943406014195085266845655353957988968820134704, 1965593254291461501637330902918203684832716283083) which equals 1.

You may not use any builtin or library function which solves this problem for you.

\$\endgroup\$
  • \$\begingroup\$ Is there a reason you picked that specific number? \$\endgroup\$ – Pavel Jul 6 '17 at 20:07
  • \$\begingroup\$ I think that unless there's a simple formula that gets that number, hardcoding that value would take more bytes than the rest of the code. \$\endgroup\$ – Pavel Jul 6 '17 at 20:07
  • \$\begingroup\$ @Phoenix I added a simple formula. \$\endgroup\$ – user9206 Jul 6 '17 at 20:13
  • \$\begingroup\$ I don't think it's a great idea to use nubmers that are so large that many languages require special constructs to represent them, it gives an unfair advantage to languages with arbitrary precision integers, which already tend to be shorter. \$\endgroup\$ – Pavel Jul 6 '17 at 20:19
  • \$\begingroup\$ @Phoenix I take your point but the point of this challenge is to devise efficient code for large inputs. Languages with builtin large number support tend to be quite slow (e.g. python) compared to e.g. C. I would like to leave it like this. \$\endgroup\$ – user9206 Jul 6 '17 at 20:22
  • \$\begingroup\$ Is there an efficient way to find the multiplicative order modulo a prime of a number, short of factoring p-1? \$\endgroup\$ – xnor Jul 7 '17 at 4:59
  • \$\begingroup\$ @xnor, none known. \$\endgroup\$ – Peter Taylor Jul 7 '17 at 7:35
  • \$\begingroup\$ @PeterTaylor Is 100 bits too big to factorize without calling library code to do it for you? Or could the question allow you to factorize the number beforehand? (Wolfram alpha will do that for free for example for the number in my question minus 1.) \$\endgroup\$ – user9206 Jul 7 '17 at 7:52
  • \$\begingroup\$ @PeterTaylor I am just wondering how much I need to reduce the number by. Currently it is 160 bits. \$\endgroup\$ – user9206 Jul 7 '17 at 8:37
  • \$\begingroup\$ @PeterTaylor Actually even the command line tool factor can handle the 160 bit number it turns out \$\endgroup\$ – user9206 Jul 7 '17 at 8:52
0
\$\begingroup\$

Escape the Labyrinth!


Introduction

You are stuck in a labyrinth. You only have your brain and a map. Now you need to find a way out, of course your brain doesn't have much memory (or else you wouldn't be stuck!) so you need to optimize your mental code for size. Of course we can't trivially program in the brain-language, so your brain will also accept any other language.

Specification

Input

Your input will be a Matrix. You may encode it however serves your language best as long as the format doesn't encode additional information. For the purpose of this challenge I will use a list of lists for representation and explanation.

Said matrix will contain four distinct values:

  • 0: This marks a spot you can move onto
  • 1: This marks a wall
  • 2: This marks the starting point
  • 3: This marks the target point

It is guaranteed that there will be exactly one occurence of type-3 and type-2. You may also change the above values / data-types to your liking as long as you don't encode additional information.

It is guaranteed that you will get an input that has a solution. If the input doesn't have a valid solution, the behavior is left undefined. Your program may not terminate, it may error out, it may simply return nothing, it may blow up, it may become a political activist or it may do something else.

You may assume that the input labyrinth is walled-off, that is you can't actually "leave" the labyrinth.

Output

Your output will be sequence of four different values:

  1. L: Stands for left
  2. R: Stands for right
  3. U: Stands for Up
  4. D: Stands for Down

You may change the values and data types of the above constants to your liking, as long as you document these changes and you can uniquely infer the path.

What to do?

Given the labyrinth, start your virtual character at the position tagged 2 and find a way to the position tagged 3. You may not pass through walls (1 cells) and you may only go one step up, left, right or down in each step. You also need to document your action of course in each step, ie output it as described above.

Note: You do not have to find the shortest path, but rather a path.

Who wins?

This is , so the shortest solution in bytes wins! Standard loophole rules apply of course. Standard I/O rules also apply.

Example

[ 
[1,1,1,1,1,1,1,1,1,1],
[1,1,1,1,1,1,1,1,1,1],
[1,2,0,1,0,1,1,0,1,1],
[1,1,0,1,0,0,0,0,1,1],
[1,1,0,0,0,1,1,1,1,1],
[1,1,1,0,1,1,0,0,1,1],
[1,1,0,0,1,0,0,0,1,1],
[1,1,1,0,0,0,1,0,1,1],
[1,1,1,1,1,1,1,3,1,1],
[1,1,1,1,1,1,1,1,1,1] 
]

might result in:

Going right.
Going down.
Going down.
Going right.
Going down.
Going down.
Going down.
Going right.
Going right.
Going up.
Going right.
Going right.
Going down.
Going down.
\$\endgroup\$
  • \$\begingroup\$ Potential questions: What other tags to use? Should it be allowed to receive position information of 2 and 3 in the input as well? \$\endgroup\$ – SEJPM Jul 7 '17 at 20:15
  • 1
    \$\begingroup\$ I'd be very surprised if this wasn't a duplicate. I'm stuck on mobile for quite a while, but My car only turns right is very similar except you have to manage orientation. I'd look closely at other maze challenges to see that this adds to the site. \$\endgroup\$ – FryAmTheEggman Jul 9 '17 at 21:33
  • \$\begingroup\$ I agree with FryAmTheEggman. This is very likely a dupe. \$\endgroup\$ – Gryphon - Reinstate Monica Jul 9 '17 at 23:50
0
\$\begingroup\$

Stitch the Genome

Introduction

As you probably know DNA (deoxyribonucleic acid) is made up of bases, often denoted as A T C and G. One of the coolest things we can do with DNA is sequence it, or figure out what sequence of base pairs make up the molecule. Sequencing small molecules of DNA is easy, but it is hard to sequence long strands without error. Instead, the long strands are copied many times, then cut up into many little pieces. Those pieces are then fed through the sequencer. What we end up getting are many, many sets of pieces of the strand. In each set, we are near-guaranteed to get every base in the strand, but they aren't in any order. The solution, then, is to compare all of the different sets of strand pieces we have, and try and figure out how to put them together.

Challenge

Your challenge is, given a set of strand pieces, output a possible sequence of the original strand. To simplify real life a bit, you can expect that each set will always contain the entire strand sequence (not in order, mind you), and that there will be at least one possible sequence. Observe a simple example:

Input:
 - [ATC, G]
 - [CG, AT]
Output: ATCG

From the first input, we deduce two possibilities: ATCG and GATC. From the second input, we deduce another two possibilities: CGAT and ATCG. As you can see, the only common possibility is ATCG, and thus that is our answer. Let's look at another example:

Input:
 - [AT, G, C]
 - [A, TG, C]
Output: ATGC or CATG

Here, we deduce six possibilities from the first input: ATGC, ATCG, GATC, GCAT, CATG and CGAT. Then, from the second input, we deduce another six possibilities: ATGC, ACTG, TGAC, TGCA, CTGA and CATG. Since there are two common possibilities, ATGC and CATG, we can output either one.

Essentially, this problem can be reduced to: find a common permutation of the input.

Specifics

  • You may write a program or function
  • You may input in any acceptable format (array of arrays, list of lists, separated string, etc.). Furthermore, you may substitute A T C and G in your input with any other unique values, as long as you're consistent
  • You may output in any acceptable format
  • Standard loopholes apply

Test Cases

Format:

Input:
 - Pieces 1
 - Pieces 2
 - Etc.
Possible Outputs: [Possible output 1, possible output 2, etc.]

Input: 
 - [G, A, C, C, T, A, G]
 - [GAC, C, TAG]
 - [G, AC, CT, AG]
 - [GA, CC, T, A, G]
Possible Outputs: [GACCTAG]

Input: 
 - [G, C, G, C]
 - [G, C, GC]
 - [G, CG, C]
Possible Outputs: [GCCG, CGCG, GCGC, CGGC]

Input: 
 - [TA, A]
 - [TA, A]
 - [T, AA]
Possible Outputs: [TAA]

Input: 
 - [CC, T, A]
 - [CC, T, A]
 - [C, CT, A]
Possible Outputs: [CCTA, ACCT]

Input: 
 - [GAG, C, T, C]
 - [GA, G, C, TC]
 - [GA, G, C, T, C]
 - [G, A, G, C, T, C]
 - [G, AGC, TC]
Possible Outputs: [GAGCTC, TCGAGC]

Input: 
 - [AG, A, C, A, T, G]
 - [AG, A, C, A, T, G]
 - [AGAC, A, TG]
 - [AGA, CA, T, G]
 - [A, G, AC, A, T, G]
 - [A, G, A, C, ATG]
Possible Outputs: [AGACATG]

Input: 
 - [C, A, A, C, T]
 - [CA, A, C, T]
 - [CA, A, C, T]
 - [C, A, AC, T]
 - [C, A, A, C, T]
 - [C, AA, C, T]
Possible Outputs: [CAACT, TCAAC]

Input: 
 - [CA, G, C]
 - [CAG, C]
Possible Outputs: [CAGC, CCAG]

Input: 
 - [A, GT]
 - [A, G, T]
 - [AG, T]
Possible Outputs: [AGT]

There is a set of 100 random test cases here, or you can check out the java program that generated them.

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  • \$\begingroup\$ Too much intro, IMHO. \$\endgroup\$ – Adám Jul 12 '17 at 17:50
  • \$\begingroup\$ @Adám that was fast! I'll look into cutting down at that! Got to go do a thing now though, so it may be a while.... \$\endgroup\$ – Socratic Phoenix Jul 12 '17 at 17:51
  • \$\begingroup\$ any other unique characters or numbers? \$\endgroup\$ – Adám Jul 12 '17 at 17:53
  • \$\begingroup\$ @Adám hmm... unique values i guess... I'll update it now \$\endgroup\$ – Socratic Phoenix Jul 12 '17 at 18:31
0
\$\begingroup\$

What's Underneath the Sine Wave?

Task

Your task is to output a part of the sine wave out of any characterss of your choosing and on any background of your choosing. The wave can start and end either on the highest or the lowest point of the wave if both are the same.

The challenges main part is what happens below the wave (or above if you chose to start at the peaks of the wave). For each column, looking top-to-down it should repeat until the bottom the segment of spaces until the wave.

Or a visual explanation:

Start with a sine wave of your choosing (this is not a valid one as it isn't 50x20, but smaller to save space):

             ####             
           ##    ##           
          #        #          
         #          #         
        #            #        
       #              #       
      #                #      
     #                  #     
    #                    #    
  ##                      ##  
##                          ##

and then, look top-down and until the 1st encounter of a non-background character record the characters and then repeat them:

        ↓   ↓####             
        ↓  ##  P ##           
      4x↓ # ↓  P   #          
        ↓#  P  P    #         
        X   ↓  P     #        
       #↓   P  P      #       
      # ↓4x ↓  P       #      
     #  ↓   P  P        #     
    #   ↓   ↓  P         #    
  ##    P   P  P          ##  
##      ↓   ↓  P            ##

so for this the output would be

             ####             
           ########           
          #  ####  #          
         # ######## #         
        #    ####    #        
       #  ##########  #       
      #      ####      #      
     #   # ######## #   #     
    #     #  ####  #     #    
  ##    #  ########  #    ##  
##           ####           ##

Clarifications

  • There can be any amount of leading/trailing lines with any amount of whitespace
  • On each line there can be extra leading whitespace, as long as the amount is equal on all lines
  • The width should be at least 50 characters total (excluding columns of only whitespace)
  • The height should be at least 20 characters total (excluding lines of whitespace only)
  • The repeating bottom parts must be cut from the bottom (or top) of the wave
  • Inaccuracies due to rounding or floating-point errors can be dismissed
  • The background character has to be constant
  • The wave characters can be different, as long as they aren't ever equal to the background
  • This is , the shortest code per language wins!

Sample outputs

                         XXXXXX
                       XXXXXXXXXX
                     XX  XXXXXX  XX
                    X  XXXXXXXXXX  X
                   X     XXXXXX     X
                  X  XXXXXXXXXXXXXX  X
                XX       XXXXXX       XX
               X    X  XXXXXXXXXX  X    X
              X      XX  XXXXXX  XX      X
             X     X   XXXXXXXXXX   X     X
            X            XXXXXX            X
           X      X XXXXXXXXXXXXXXXX X      X
          X              XXXXXX              X
         X      XX     XXXXXXXXXX     XX      X
        X          X XX  XXXXXX  XX X          X
       X       X    X  XXXXXXXXXX  X    X       X
      X                  XXXXXX                  X
    XX        X   X  XXXXXXXXXXXXXX  X   X        XX
   X                     XXXXXX                     X
XXX          X     XX  XXXXXXXXXX  XX     X          XXX

..................................................
DCB....................QPONM....................10
...A9........0.......SRQPONMLK.......C........32
.....8..........X...T..QPONM..J...F..........4
......7.......Z...VU.SRQPONMLK.IH...D.......5
.......6...............QPONM...............6
........5......Y.W..TSRQPONMLKJ..G.E......7
.........4.............QPONM.............8
...................U.SRQPONMLK.I
..........3.......V.T..QPONM..J.H.......9
...........2....X....SRQPONMLK....F....A
............1..........QPONM..........B
.................W.UTSRQPONMLKJI.G
.............0.........QPONM.........C
..............Z...V..SRQPONMLK..H...D
...............Y....T..QPONM..J....E
...................U.SRQPONMLK.I
................X......QPONM......F
.................W..TSRQPONMLKJ..G
..................V....QPONM....H
...................U.SRQPONMLK.I
....................T..QPONM..J
.....................SRQPONMLK
.......................QPONM..................................
...
.
....

sandbox

  • please suggest (or just edit in) ways of making this clearer
  • Anything missing?
  • Should I make this challenge take input, rather than being an broad kolmogorov-complexity challenge?
\$\endgroup\$
  • \$\begingroup\$ Is the sample output for input X? \$\endgroup\$ – officialaimm Jul 3 '17 at 12:27
  • \$\begingroup\$ @officialaimm The characters can be of your choosing, there's no input currently \$\endgroup\$ – dzaima Jul 3 '17 at 12:27
  • \$\begingroup\$ So, all the positions marked by X should have same character or can have different characters? \$\endgroup\$ – officialaimm Jul 3 '17 at 12:40
  • \$\begingroup\$ @officialaimm They can have any characters \$\endgroup\$ – dzaima Jul 3 '17 at 12:42
  • 1
    \$\begingroup\$ I think its better if you showcase sample output with different characters then. \$\endgroup\$ – officialaimm Jul 3 '17 at 12:53
  • \$\begingroup\$ I can't tell what the task is from reading the description, or from looking at the example. It might help to walk through a few example columns to make it clear, then follow up with the full wave examples after that. \$\endgroup\$ – trichoplax Jul 17 '17 at 14:12
  • \$\begingroup\$ @trichoplax good idea \$\endgroup\$ – dzaima Jul 17 '17 at 14:12
  • \$\begingroup\$ Thanks. A second look at the examples was enough for me to grasp the pattern, but a step by step example would probably have got it across quicker. \$\endgroup\$ – trichoplax Jul 17 '17 at 14:14
0
\$\begingroup\$

Pristine Pristige

A pristine program, as defined by Calvin'sHobbies, is

a program that does not have any errors itself but will error if you modify it by removing any contiguous substring of N characters, where 0 < N < program length.

Pristige is a language I designed in which all syntactically valid programs are pristine.

Pristige works just like Brain-Flak, except every function requires a airity declaration at the beginning. An airity of n is declared with n .s followed by a |. For example the Brain-Flak program

({}())

Is equivalent to the Pristige Program

(..|{|}(|))

In addition Pristige requires that there is only one function at the top level of the program. Meaning that

(.|{|}){.|(..|{|}[.|(|)])}

Is an invalid program.

To be absolutely concrete here is a grammar that spans all syntactically valid Pristige programs:

S → (A) : <A> : {A} : [A]
A → .AS : |

Task

You must write a compiler from Pristige to Brain-Flak, that is itself a pristine program.

This is a question so answers will be scored in bytes, with less bytes being better.

Rules

  • You must either throw an error (or print error if your language cannot do so) if the inputted program is syntactically invalid.

  • If the input is syntactically valid you must output an equivalent Brain-Flak program. The simplest way to do this is to remove all instances of . and |, but you are not required to do so.

  • You may use any default IO format.

  • Your program must be a pristine program. That means deleting any continuous substring must cause an error

Reference Implementation

Here will go an implementation I have not yet completed

Test Cases

Here will go test cases

\$\endgroup\$
  • \$\begingroup\$ Surely we should print error if the program is syntactically invalid? Sort of unrelated, but is Pristige a mix of the words pristine and prestige? \$\endgroup\$ – FryAmTheEggman Jul 17 '17 at 19:25
0
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Write a code poem

It is said that Larry Wall, creator of Perl, wrote a poem titled "Black Perl" in said language, as shown here.

The poem is fully functional (working syntax, no runtime errors, etc. [no errors in general]).

The challenge:

In any language (practical languages recommended), write a haiku (example of one at https://en.wikipedia.org/wiki/Haiku).

Coding rules:

  • The poem must be able to function properly (no errors).
  • Unlike Wall's poem, you must run through the whole program (exits only at the end).
  • If you define a function to act as a word, it will count towards your poem.
  • Caught errors and other error-handling tricks are valid.

Misc rules:

  • You cannot use multi-line strings or line continue symbols, etc. (No multi-line functions/tricks).
  • Brackets, parentheses, and other grouping symbols (with the exception of < and > as operators are ignored unless as a string.

Example lines (written in Python, not the best, probably):

while i_love ....: # i_love counts as two words

i_am > than_you # read symbols/operators as words

"""my love for ...
is ....... by ...""" # Invalid, as stated by one of the misc. rules

me(,"john", "abby",
    "and liz") # invalid, line continuation

Winning:

This is a , so submission with the highest amount of votes wins.

For sandbox only:

How can I improve on this challenge? Is there anything else I should add? Let me know in the comments.

\$\endgroup\$
  • 1
    \$\begingroup\$ This is currently both too broad and unclear. What does "work" mean? What is a "script"? What is allowed besides "words" (whatever those are)? How do we measure answers against each other? Try to look at some of the challenges on this site to get a better feel for what we do here - I'm afraid this is very far off the mark. You can try asking other users in chat, once you get some reputation, about ways to make this fit better, but personally I don't think this kind of challenge is a good fit for this site. \$\endgroup\$ – FryAmTheEggman Jul 17 '17 at 19:35
  • \$\begingroup\$ I like the idea, but I think you need to be more specific in what is valid and invalid. If my script is just one giant multi-line string, it satisfies your requirement, but obviously that's not what you're going for. \$\endgroup\$ – wrymug Jul 17 '17 at 19:37
  • \$\begingroup\$ Will edit the question. \$\endgroup\$ – S.G. Harmonia Jul 17 '17 at 19:37
  • \$\begingroup\$ Are caught errors allowed? \$\endgroup\$ – wrymug Jul 17 '17 at 20:38
  • \$\begingroup\$ You mean stuff like try? \$\endgroup\$ – S.G. Harmonia Jul 17 '17 at 20:57
  • \$\begingroup\$ Who wins? What's the criterion for deciding that? \$\endgroup\$ – Rɪᴋᴇʀ Jul 17 '17 at 21:32
  • \$\begingroup\$ @Riker I am currently thinking about that. \$\endgroup\$ – S.G. Harmonia Jul 17 '17 at 23:07
  • \$\begingroup\$ @S.G.Harmonia yeah \$\endgroup\$ – wrymug Jul 18 '17 at 0:05
  • \$\begingroup\$ I do think this question might be too broad. Maybe make it so it has to be a haiku? And then score by popularity contest \$\endgroup\$ – wrymug Jul 18 '17 at 0:07
  • \$\begingroup\$ 1. I have no idea where to close the parenthesis in "Brackets, parentheses, and other grouping symbols (with the exception of < and > as operators are ignored unless as a string.". 2. A popularity contest should have a clear spec to identify valid answers, and an indication of what aspect of the answers makes them good. It's a hack to judge subjective contests like codegolf.stackexchange.com/q/33172 . I don't think this has a clear spec ("Don't produce an error" is far too broad), and it's not clear what makes a haiku program a good haiku program? \$\endgroup\$ – Peter Taylor Jul 18 '17 at 7:35
  • \$\begingroup\$ As an illustration of the problems raised in point 2, consider that I can take any haiku I want, remove the characters ,.+-<>[] (of which only the first two are likely to be present anyway) and claim it's a brainfuck program which does nothing. And before you edit to add a rule to prohibit that directly, let me emphasise the word illustration. The problem is far deeper, and I don't think it can be fixed. It certainly can't be papered over. \$\endgroup\$ – Peter Taylor Jul 18 '17 at 7:37
0
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Challenge

Take a number and output it with 4 digits or less using letters and numbers. For example; 270,030 would turn into 2.7K.

Key

Billion -> B

Million -> M

Thousand -> K

Rules

  • You may choose to accept input numbers that include commas delimiting every three decimal places (such as 123,456,789).
  • Round to nearest, half-up.
  • Numbers will only go up to a trillion.
  • The mantissa part of the answer should be at least 1.
  • All letters must be uppercase and as specified below.
  • Outputs must be 4 or less characters wide.
  • Outputs must be as mathematically precise as possible. Example:
    • 154,893 -> 100K NOT OK
    • 154,893 -> 155K GOOD
  • If there are multiple outputs with the same mathematical precision, return the shortest one. (If they are the same length, you may return either.) Example:
    • 1000 -> 1000 NOT OK
    • 1000 -> 1K GOOD

Examples:

1,234,567 -> 1.2M
102 -> 102
1000 -> 1K
1001 -> 1001
100,000 -> .1M
12,345,678,912 -> 12B
1,452,815,612 -> 1.5B

Submissions

\$\endgroup\$
  • \$\begingroup\$ I made a bunch of edits, feel free to roll back any changes you dislike. For the case of 100,000, should you return .1M, 0.1M, or 100K? \$\endgroup\$ – musicman523 Jul 15 '17 at 23:39
  • \$\begingroup\$ I like 100K best, maybe we should change it to 5 or less characters. Also thanks for the edits. \$\endgroup\$ – zoecarver Jul 15 '17 at 23:41
  • \$\begingroup\$ Personally I think 4 characters is fine. To further elaborate on my question: If you are outputting a decimal, do you require a leading 0 or would you allow .1M? \$\endgroup\$ – musicman523 Jul 15 '17 at 23:46
  • \$\begingroup\$ I think .1M should be 100K and we should allow up to 4 digits (or under 5). \$\endgroup\$ – zoecarver Jul 15 '17 at 23:47
  • \$\begingroup\$ Oh, I thought it was 4 digits or less. My misunderstanding. If .1M is not allowed then you should clarify in the question that the "number" part of the answer should be at least 1. However this seems rather arbitrary to me, when your original goal was to get the number as short as possible \$\endgroup\$ – musicman523 Jul 15 '17 at 23:49
  • \$\begingroup\$ Ok, I will specify. thanks for the help! \$\endgroup\$ – zoecarver Jul 16 '17 at 0:36
  • 2
    \$\begingroup\$ 1. The ""number"" part is called the mantissa. 2. I think "as specified below" should be "as specified above". 3. 154,894 -> 1.5K is not GOOD. It should be 155K. 4. Or should it? I don't see any rules specifying how to round. 5. 1K has less precision than 1000 because it gives fewer significant figures. \$\endgroup\$ – Peter Taylor Jul 16 '17 at 7:05
  • \$\begingroup\$ Thank you for your feedback! I have applied your edits, anything else? \$\endgroup\$ – zoecarver Jul 18 '17 at 3:29
  • \$\begingroup\$ I am going to post this unless anyone has any other feedback. \$\endgroup\$ – zoecarver Jul 19 '17 at 19:32
0
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Bastion Breach

Stolen with permission from the minigame with the same title from Angels with Scaly Wings

Introduction and rules

  • There are two players
  • Both players receive a suit of cards (2-9, ace and face cards) and another is randomly shuffled into a public zone.
  • The players then proceed to choose one of the cards in their hand to bid for the card. Once they've used a card, it can't be used again.
  • The owner of the card with the highest value then gets a point.
  • If the highest scoring card was in the middle or if the value of the highest cards is equal, nobody gets a point. That point then goes onto the next round and is awarded to the winner of that round.
  • The ace is special: it wins against a face card, ties with another ace, and loses against a number card. Effectively the scoring system is reversed for the ace card.
  • The player with the most points at the end of the game wins.

Input/Output format for bots:

At the beginning of each round, your bot will be called as a whole program and will receive input in the form cards-in-middle your-played-cards opponents-played-cards as command line arguments.

Example: 23456789JKQA 24 56 - The cards in the middle are 23456789JKQA, your played cards are 24 and your opponents are 56. Your opponent won both of the previous games and what you're bidding for is the card 4.

You will output a single character representing a card that you haven't already played. If it is invalid or you've already played it, you automatically forfeit the round. Valid outputs are the following characters: 23456789JQKA

Example scoring

Middle card: 2
Bot 1 card: 4
Bot 2 card: 5
Winner: Bot 2
----
Middle card: Q
Bot 1 card: K
Bot 2 card: 5
Winner: Bot 1
----
Middle card: Q
Bot 1 card: K
Bot 2 card: A
Winner: Bot 2
----
Middle card: Q
Bot 1 card: 6
Bot 2 card: 5
Winner: None, next round scores another point
----
Middle card: A
Bot 1 card: 2
Bot 2 card: J
Winner: Bot 1
----
Middle card: 5
Bot 1 card: K
Bot 2 card: 5
Winner: Bot 1
----
Middle card: 5
Bot 1 card: 2
Bot 2 card: 5
Winner: None, next round scores another point
----
Middle card: A
Bot 1 card: 9
Bot 2 card: J
Winner: None, next round scores another point

Scoring for regular cards: 23456789JQK

Scoring for the ace:

wins: JQK
draw: A
lose: 23456789

Submission

You should write your entry as

Bot Name, Language

Insert
Code
Here

Explanation/Random stuff here

Running the tournament yourself

The controller is available here (Sandbox: Not written yet). It can be ran with python3 controller.py or python controller.py depending on your path. It expects all the bots to be in the bots directory. You can get all the bots already entered with python get_answers.py or python3 get_answers.py

Other rules and information

  • Bots are not allowed to use file storage.
  • The competition will be Round Robin, all bots will play against all others and they will be ranked by the number of other bots they've won against.

    • A loss counts as nothing
    • A draw counts as one point
    • A win counts as two points
  • The bot with the most points wins the game.

  • The bot that wins the final game, to be ran on wins the tournament.

Sandbox notes:

  • I have yet to create a controller for this though I'll probably be basing it off the one I did for the cake cutting contest
  • I hope I've explained it well enough, it's a simple game and I want the barrier for entry as low as possible. I've tried fixing what I believe went wrong with the GOL challenge and feel that KOTHs work better when they have lots of bots.
  • I have permission to post this from the developer of the game in question, see first line.
  • Feedback on readability is very much appreciated and welcome
\$\endgroup\$
  • \$\begingroup\$ "Both players receive a suit of cards (2-9, ace and face cards) and another is randomly shuffled into a public zone. The players then proceed to choose one of the cards in their hand to bid for the card." Which card? Reverse engineering from the example, I think that what's meant is that the third suit is uniformly shuffled and dealt face up in a line, such that both players can see the entire sequence of auctions, and then the cards are auctioned off one by one from left to right. Future references to "the middle" are presumably references to the same "public zone"? \$\endgroup\$ – Peter Taylor Jun 29 '17 at 11:34
  • \$\begingroup\$ "The ace is special: it wins against a face card, ties with another ace, and loses against a number card." Unless I'm missing something, there's nothing special there: just an overcomplicated abstraction. On the basis of KISS I would suggest making the cards be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or A, B, C, D, E, F, G, H, I, J, K, L, M. \$\endgroup\$ – Peter Taylor Jun 29 '17 at 11:36
  • \$\begingroup\$ The ace card is different in that it's scored in reverse compared to the other cards. And your first comment is correct, how would you suggest rewording for it to be more clear? \$\endgroup\$ – Blue Jun 29 '17 at 15:31
0
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What's that character? (Part 1)

Recently I ran a command on my laptop that returned a bunch of characters - some printable, some non-printable. I'm having trouble figuring out what those characters are, so I could use some help. Unfortunately, I'm running low on disk space, so you'll have to write me the shortest program you can that I can run.

Challenge

Given a list of ASCII characters, return their names as written on www.asciitable.com, my go-to site for looking up character points.

Input

You may take a string, a list of characters, or a list of ASCII code points (e.g. 'a' -> 97).

You may optionally take the length of the string/list as well. Note that for C, you must take this parameter, since the string could contain NUL bytes, so strlen won't work here.

Output

Output is flexible as usual; you may print or return from a function as you see fit. You should output a list of strings.

The Table

0 NUL
1 SOH
2 STX
3 ETX
4 EOT
5 ENQ
6 ACK
7 BEL
8 BS
9 TAB
10 LF
11 VT
12 FF
13 CR
14 SO
15 SI
16 DLE
17 DC1
18 DC2
19 DC3
20 DC4
21 NAK
22 SYN
23 ETB
24 CAN
25 EM
26 SUB
27 ESC
28 FS
29 GS
30 RS
31 US
32 Space
33 !
34 "
35 #
36 $
37 %
38 &
39 '
40 (
41 )
42 *
43 +
44 ,
45 -
46 .
47 /
48 0
49 1
50 2
51 3
52 4
53 5
54 6
55 7
56 8
57 9
58 :
59 ;
60 
63 ?
64 @
65 A
66 B
67 C
68 D
69 E
70 F
71 G
72 H
73 I
74 J
75 K
76 L
77 M
78 N
79 O
80 P
81 Q
82 R
83 S
84 T
85 U
86 V
87 W
88 X
89 Y
90 Z
91 [
92 \
93 ]
94 ^
95 _
96 `
97 a
98 b
99 c
100 d
101 e
102 f
103 g
104 h
105 i
106 j
107 k
108 l
109 m
110 n
111 o
112 p
113 q
114 r
115 s
116 t
117 u
118 v
119 w
120 x
121 y
122 z
123 {
124 |
125 }
126 ~
127 DEL

Test Cases

[0, 97, 7, 22] -> [NUL, a, BEL, SYN]

More to come...

Meta

  • Would it be more interesting to use the UTF-8 names for the printable characters (0x20 - 0x7E), and the ASCII names for the control characters?
\$\endgroup\$
  • \$\begingroup\$ hand copy the table from the website please dont. Try a Google search: theasciicode.com.ar/ascii-codes.txt \$\endgroup\$ – Stephen Jul 23 '17 at 22:39
  • \$\begingroup\$ @StepHen good call, thanks \$\endgroup\$ – musicman523 Jul 23 '17 at 23:24
  • \$\begingroup\$ Downvoter: I would much like your feedback rather than just your vote \$\endgroup\$ – musicman523 Jul 24 '17 at 1:39
  • 1
    \$\begingroup\$ IMO just have take a letter and output the code. Since that part is boilerplate str.chars.map( real program ). Also for ASCII char names NUL is it ok is we output them in lower case? e.g. nul (obviously ascii letters would have fixed case) \$\endgroup\$ – Downgoat Jul 24 '17 at 1:42
0
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How good is my mahjong hand?

Your goal is to calculate the shanten (minimal number of tiles needed for your hand to be a "waiting hand") of a Riichi mahjong hand.

What is Japanese Mahjong (or Riichi)

The goal of the game is to build a 14 tiles valid hand. Your hand is 13 tiles long, and each turn, you draw a 14th. If it doesn't make you win, you discard a tile. The tiles are grouped by colors : man, numbers, let's call them m; pin, circles, p; sou, bamboos, s; and honor tiles, z.

For p,m, and s : tiles are numbered from 1 to 9, with 4 examples each (1m 1m 1m 1m 2m 2m 2m 2m 3m 3m 3m 3m... 9m 9m 9m 9m).
z contains winds : ton for east, e; nan for south, s; sha or xia for west, w; and pei for north, n.
z contains dragons too : chun for red, r; haku for white, h; and hatsu for green, g.
Same rule, 4 examples each.
Honor tiles cannot be sequenced in a chii, they can only combine with themselves, by matching for a pair or for a pon. Don't worry, I will define terms pon and chii in the next part.

So a random hand can look like 1s 1s 1s 2s 2s 2s 3s 9p 9p 4m ez ez nz.

What is a "waiting hand"

What is called a tenpai hand, or hand that is one tile left before winning, is a hand respecting a winning shape. In general, a winning hand is composed of 4 sets of 3 sequenced (chii, like 1s 2s 3s) or matching (pon, like 1s 1s 1s) tiles, plus a pair (like 1p 1p). An example of a winning hand (14 tiles) can be : 1s 2s 3s 4s 5s 6s 6s 7s 8s 3p 3p 3p ez ez
So a "waiting hand" can be : 1s 2s 3s 4s 5s 6s 6s 7s 8s 3p 3p 3p ez where you need only ezto win.

The goal

To output a positive integer (between 0 and 7, inclusive) representing the shanten as defined above. For instance, a hand like 1s 1s 1s 2s 2s 2s 3s 9p 9p 4m ez ez nz is 2 shanten, because :
- you have a set of three 1s (a pon)
- you have a pon of 2s
- you have a pair of 9p (your pair)
- you have another pair of ez (that needs a third one to become a pon)
- you have 3 "isolated" tiles, 3s,4m,nz.

So drawing ez, and creating the pon of ez, makes you discard nz for example. Then let's imagine you draw 2s : you discard 4m, and you are now with a "waiting hand", with :
1s 1s 1s 2s 2s 2s 2s 3s 9p 9p ez ez ez, waiting on 1s or 4s. You drew two "useful tiles" to come to this hand, so you were 2 shanten.

@Sandbox : Is it on-purpose to put two detailed examples? (pro : clarifies what you have to do / con : challenge's wall of text is even bigger)

Another example

Let's see your hand looks like 4p 5p 7p 1m 1m 1m 2s 4s 6s ez sz hz hz.
- you have a pon of 1m
- you have 4p and 5p sequenced, requiring 3p or 6p to be a chii
- you have 2s 4s 6s, requiring 3s or 5s to create a chii
- you have a pair of hz
- you have 3 "isolated" tiles, 7p, ez and sz.

So, as for the first example, we have 3 isolated tiles. But are we 2 shanten? No, because 2s 4s 6s is not complete. So in fact, we have 4 useless tiles, the 4th being 2s or 6s depending on what we draw.
Proof : if we draw 3p, 3s and hz, our hand looks like that :
3p 4p 5p 1m 1m 1m 2s 3s 4s sz hz hz hz
and is waiting on the second sz to form the pair and win. We drew 3 useful tiles, so we were 3 shanten.

Test cases

3m 6m 9m 3p 5p 8p 1s 5s 8s ez sz nz gz -> 7 shanten
3m 6m 9m 3p 4p 5p 8p 1s 5s 8s ez sz nz -> 6 shanten
3m 6m 9m 3p 4p 5p 8p 1s 5s 8s ez nz nz -> 5 shanten
3m 6m 9m 3p 4p 5p 8p 8p 5s 8s ez nz nz -> 4 shanten
3m 5m 6m 9m 3p 4p 5p 8p 8p 5s 8s nz nz -> 4 shanten
3m 4m 5m 6m 3p 4p 5p 8p 8p 5s 8s nz nz -> 3 shanten
3m 4m 5m 6m 3p 4p 5p 8p 8p 5s 5s nz nz -> 2 shanten
3m 4m 5m 6m 7m 3p 4p 5p 8p 5s 5s nz nz -> 1 shanten
3m 4m 5m 6m 7m 3p 4p 5p 5s 5s nz nz nz -> 0 shanten
6s 7s 8s 1p 1p 1p 3p 4p 5p 6p 7p 7p 7p -> 0 shanten
3s 4s 5s 6s 7s 2p 4p 6p ez nz nz hz gz -> 3 shanten
3s 4s 5s 6s 7s 7s 1p 2p 4p 6p nz nz hz -> 2 shanten
3s 3s 4s 5s 6s 7s 7s 2p 4p sz sz nz nz -> 2 shanten
3s 3s 4s 5s 5s 6s 7s 7s 4p nz nz sz sz -> 2 shanten
3s 3s 3s 4s 5s 5s 7s 8s 2p 3p 4p 6p 6p -> 1 shanten
1m 1m 1m 2s 7s 7s 1p 3p 4p 9p sz hz cz -> 4 shanten
3m 6m 9m 3p 8p 1s 5s 8s ez sz nz gz cz -> 8 shanten

Protip

Calculating shanten can be complex, so here is a link that can help you doing so. You can refer to this site if you need any other information on riichi mahjong. Good luck!

Scoring and extra rules

This is code-golf, so shortest answer in bytes wins for its language. Standard loopholes apply.

NB : If you know mahjong, or were curious and dug deeper into the rules, don't mind with specific shapes like seven pairs or thirteen orphans.

tags :
@Sandbox : should I create some sort of in a pastebin or something?
Related
Related too
Something that can help if you speak japanese <- you can copypaste in the field the output from this program :)
Another protip

SANDBOX

Feel free to comment and tell me if this is on-purpose in PPCG, if there is any way to improve the way I say things, if I'm unclear anywhere ...

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  • \$\begingroup\$ If you downvote, please explain why (by commenting or suggesting edit) so I can improve. If you don't, then don't downvote, this makes just the post less visible for no reason. \$\endgroup\$ – V. Courtois Jul 24 '17 at 6:17
  • \$\begingroup\$ Didn't downvote this, nor have I read through it yet. But that may be the reason it just appears to be a wall of text. Maybe try splitting it up into multiple posts or breaking the text down into easier read chunks. Or even take bits out that might not be needed. \$\endgroup\$ – TheLethalCoder Jul 24 '17 at 8:28
  • \$\begingroup\$ @TheLethalCoder in fact I'd like to explain clearly what is mahjong (to put some context in the challenge). Though you're right, it is a wall of text, that's what it looks like to me too. And I can't really "split it" into multiple posts, because it is what the challenge will look like in the end. TL;DR I want to be as clear as possible since this challenge is gonna be hard. \$\endgroup\$ – V. Courtois Jul 24 '17 at 8:32
  • 1
    \$\begingroup\$ I think you should be able to make it clearer by tidying the post up and formatting it more. The problem is a lot of people will open the question see all the text and move on without giving it a chance \$\endgroup\$ – TheLethalCoder Jul 24 '17 at 8:45
  • \$\begingroup\$ @TheLethalCoder I do know about this. How do you think I can make it tidier without removing content? \$\endgroup\$ – V. Courtois Jul 24 '17 at 8:46
  • \$\begingroup\$ To be honest I have no clue, if I knew more on the subject I'd be able to help more \$\endgroup\$ – TheLethalCoder Jul 24 '17 at 8:49
  • \$\begingroup\$ @TheLethalCoder mmh okay. Japanese mahjong is a well documented topic (I already linked some docs in the post). So maybe I shouldn't define the rules myself and let a link do the job? \$\endgroup\$ – V. Courtois Jul 24 '17 at 8:52
  • 1
    \$\begingroup\$ Well you'd want the important information in the post so it is self contained. Maybe the "fluff" can be trimmed down. \$\endgroup\$ – TheLethalCoder Jul 24 '17 at 8:53
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I'm sort of brainstorming a challenge. I'm not really paying attention to question format at the moment.

The challenge would be to generate and populate a Golf Scorecard.

The output would look something like this:

Hole    Par     Strokes Score
1       3       3       0
2       5       4       -1
3       4       5       1
4       3       4       1
5       4       4       0
6       5       3       -2
7       4       3       -1
8       3       5       2
9       5       5       0
Totals  36      36      0

A Par value would be generated by choosing a random number in [3, 4, 5].

A Stroke value would be generated by choosing a random number within some range (say -2/+2 or -3/+3) of Par. A Stroke can be no lower than 1.

Score = Stroke - Par

Total is adding up all the values in that column (not including Hole).

I'm wondering if it would be too much to ask to have the generated values be somewhat realistic (unlike my example output), in that Par values tend to be mostly 4, with about the same number between 3 and 5, and Stroke values tend to be close to or above Par, with it being very unlikely to be 1.

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0
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Proposed Question

Triskaidekaphobic Primes

It is known that a certain number, which lies between 12 and 14, brings bad luck. The Church of Triskaidekaphobia (CoTDP) asserts that the key to salvation is avoiding this number in all situations, such as numbering floors, license plates, space shuttle missions and more.

The IT department of CoTDP is looking for talented developers. Candidates must prove their ability to program in accordance with Triskaidekaphobic dogma. Can you get this prestigious job?

Your Mission

Write a program that prints all prime numbers below 1000, excluding the unlucky one. the program must obey the CoTDP programming rules.

Rules

  1. Numbers whose absolute value is greater than 12 and smaller than 14 are considered unlucky and must be avoided.
  2. Unlucky numbers must not be used in the program:
    • Must not appear in the program, in any representation/base.
    • Must not be the value of an expression or calculation (e.g. 5 + 8).
    • Must not be an intermediate value in an expression (e.g. 5 + 8 + 3, 35 % 22 == 0).
    • Must not be stored in a variable, register, memory etc (e.g. for i in xrange(20):).
    • Must not be passed to a function or returned from one.
    • The above applies to any complex type which contains an unlucky number (e.g. range(20) in Python 2).
    • The above applies to all expressions, not just constant expressions (e.g. x+1 is invalid if x happens to be 12).
  3. No calculation, or intermediate value of a calculation, may yield an unlucky number. For example, and for i in xrange(20): are forbidden.
  4. Output lines bust be separated by line-feed only (no carriage return).
  5. You must find primes using basic mathematical operations. If your language provides tools to find primes or test primality, you must not use them.
  6. Standard Loopholes apply.

Scoring

This is code-golf, the shortest solution (in bytes) wins.

Questions for Meta

  • Do the limitations make sense for all sorts of languages? I think they cover languages such as C/Python/Java that use expressions, and also languages such as BrainFuck that manipulate memory (I think it's obvious that you must not write 13 in a memory cell).
  • Is there a trivial solution that makes it uninteresting?
  • Would it be better as a popularity contest?
  • Or maybe, accept the shortest, but give a bounty for the most interesting/creative answer?
  • Can the expression "Church of Triskaidekaphobia" be considered offensive to followers of some churches?
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  • \$\begingroup\$ Should we treat numbers such as 39 (13 * 3) as prime, or not prime for the sake of this calculation? If 13 is not a prime, then 39 is, but it's up to you. (I did something kind of similar to this here) \$\endgroup\$ – Stephen Jul 29 '17 at 19:15
  • \$\begingroup\$ @StepHen, IMO, an unlucky divisor is still a divisor. I think asking for "primes below 1000, excluding the unlucky one" makes it clear. Your interpretation might make it more challenging, but I'm not sure how it would work - 39 is a multiple of 3 (though you shouldn't actually do this division), so how can it be prime? Maybe 169. \$\endgroup\$ – ugoren Jul 29 '17 at 19:23
  • \$\begingroup\$ Related: we are not allowed to store 13, right? \$\endgroup\$ – Stephen Jul 29 '17 at 19:37
  • \$\begingroup\$ @StepHen, I'm not sure what you mean by "store". My intention is that 13 won't be used in any way. I write that it can't be used in the program and can't be derived by calculation, so how can it be stored? \$\endgroup\$ – ugoren Jul 29 '17 at 20:12
  • \$\begingroup\$ Well you could store it with x = ord("\r"), although if you can't use it there's not much point. \$\endgroup\$ – Stephen Jul 29 '17 at 20:25
  • \$\begingroup\$ ord("\r") is an expression that yields 13, and is therefore invalid. But it's worth clarifying. \$\endgroup\$ – ugoren Jul 29 '17 at 20:27
  • \$\begingroup\$ Your post (as it stands) says no calculation, not no expression. \$\endgroup\$ – Stephen Jul 29 '17 at 20:28
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    \$\begingroup\$ Numbers whose absolute value is greater than 12 and smaller than 14 are considered unlucky and must be avoided. is 12.5 allowed? \$\endgroup\$ – l4m2 Apr 2 '18 at 19:09
0
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Fill to the line!

Given input consisting of the characters _, , and newline, fill the empty space up to the line!

Example:

I will use # as the filler character in the example.

1. Input


________



2. Fill up to the line, but not above.


________
########
########
########
  • You may assume that the input either is rectangular (is padded), or consists only of the line and newlines.
  • You may assume that there is only one straight, unbroken line.
  • The whitespace above the line is part of the input. Do not fill above the line.

Test cases:

"
Input
"
"
Output
"
**********

"



----




"
"



----
####
####
####
####
"

**********

"


________



"
"


________
########
########
########
"
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  • \$\begingroup\$ is the input guaranteed to be rectangular? will the _ be on one line \$\endgroup\$ – Destructible Lemon May 24 '17 at 4:45
  • \$\begingroup\$ @DestructibleLemon I will edit to clarify. \$\endgroup\$ – Comrade SparklePony May 24 '17 at 12:11
  • \$\begingroup\$ If its padded its very trivial to just replace all the spaces with # \$\endgroup\$ – Notts90 May 25 '17 at 8:30
  • \$\begingroup\$ @Notts90 Not all the spaces, only the ones below the line. \$\endgroup\$ – Comrade SparklePony May 25 '17 at 12:08
  • \$\begingroup\$ Ah ok, might want to make it clearer the bit above the line are included in the input. \$\endgroup\$ – Notts90 May 25 '17 at 12:23

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