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

Sandbox FAQ

Posting

To post to the sandbox, scroll to the bottom of this page 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, though you can optionally add a title at the top. 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, and replace the post here with a link to the challenge and delete the sandbox post.

Discussion

The purpose of the sandbox is to give and receive feedback on posts. If you want to, feel free to give feedback to any posts you see here. Important things to comment about can include:

  • Parts of the challenge you found unclear
  • Comments addressing specific points mentioned in the proposal
  • Problems that could make the challenge uninteresting or unfit for the site

You don't need any qualifications to review sandbox posts. The target audience of most of these challenges is code golfers like you, so anything you find unclear will probably be unclear to others.

If you think one of your posts requires more feedback, but it's been ignored, you can ask for feedback in The Nineteenth Byte. It's not only allowed, but highly recommended! Be patient and try not to nag people though, you might have to ask multiple times.

It is recommended to leave your posts in the sandbox for at least several days, and until it receives upvotes and any feedback has been addressed.

Other

Search the sandbox / Browse your pending proposals

The sandbox works best if you sort posts by active.

To add an inline tag to a proposal, use shortcut link syntax with a prefix: [tag:king-of-the-hill]. To search for posts with a certain tag, include the name in quotes: "king-of-the-hill".

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4629 Answers 4629

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GoL flooding

Considering a 1000x1000 grid (no wrapping, borders dead), your task is to grow the maximum "stable" population from the fewer individuals.

For the purpose of this challenge, the definition of stable is a configuration who repeat with a period of less than hundred(100) generations.

Scoring

Your score is lowest number of live cells in your stable population divided by the number of initialy live cells, highest score win

meta post about on topicness

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2
  • \$\begingroup\$ How many generations does the simulation run before the score is tabulated? \$\endgroup\$ Dec 8, 2016 at 13:48
  • \$\begingroup\$ @TimmyD I would say 10.000 but feel free to suggest a better number if you think it could improve \$\endgroup\$
    – Sefa
    Dec 8, 2016 at 14:07
-2
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Convenient Palindromic quine golf, Cops

This is the cops thread, the robber's thread is here.

Cop's Challenge

A program is conveniently palindromic if

it is equal to the string derived when its reverse has all its parentheses (()), brackets ([]), and braces ({}) flipped. No other characters are special and require flipping. (<> are sometimes paired but often not so they are left out.)

copied from this challenge.

Write a conveniently palindromic program that prints its own source. This is the robber's goal:

  • Remove byte(s) from the cop's program so that the resulting program:
    • prints the original source, or
    • prints the new modified source
  • Resulting program need not be a convenient palindrome

A counterexample

JavaScript

(function $(){console.log('('+$+'())')}())//((){('(()'+$+')')gol.elosnoc}()$ niotcnuf)

is easily cracked because the robber can remove all the characters past the comment and it will still print its own source.

Rules

  • Program must be longer than one character
  • No reading from a file or grabbing from an external resource
  • Submissions that aren't cracked for 7 days are marked as "safe", and cannot be cracked anymore
  • Cop's submissions after XX/XX/XX are non-competing (can be pushed back depending on popularity), so there are still robbers around to crack it
  • The shortest safe solution in bytes wins.
  • Robbers won't have a chosen winner

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7
  • \$\begingroup\$ This is basically just a "comment-free palindromic quine" challenge, right? When those challenges have been run elsewhere, the comment-freedom has been verified via brute forcing rather than via a robber, and I suspect that the robbers might not have much to do here. (That said, some languages are slow enough that brute-forcing their correctness would be difficult.) In other news, you should probably require proper quine rules, even if we can't quite define them; under your current rules, 1 is a valid palindromic quine in PHP. \$\endgroup\$
    – user62131
    Dec 9, 2016 at 22:41
  • \$\begingroup\$ I would possibly change the palindrome restriction to convenient palindromes, as these are way easier to implement in most common languages such as JS and Python. \$\endgroup\$ Dec 9, 2016 at 23:01
  • \$\begingroup\$ @ais523 1. Yas. That was my aim! 2. It's difficult to implement a brute-force solution for a longer submission, how would that work? 3. Program must be longer than one character 4. Thanks. \$\endgroup\$ Dec 10, 2016 at 14:27
  • \$\begingroup\$ 11 then :-P. Also, in a way I think this might be more interesting with true palindromes, as it forces you to hide the backwards string somehow, but I agree that it would disqualify a lot of languages. \$\endgroup\$
    – user62131
    Dec 10, 2016 at 14:40
  • \$\begingroup\$ @ais523 I'll do a true palindrome one then a convenient palindrome one later, perhaps? (also 11 then means ?) \$\endgroup\$ Dec 10, 2016 at 14:44
  • \$\begingroup\$ @ais523 When those challenges have been run elsewhere, they have? \$\endgroup\$ Dec 10, 2016 at 14:51
  • \$\begingroup\$ Neither this challenge nor this challenge has the same task as yours, but they both disallowed comments in much the same way as this one (i.e. by ensuring that deleting from the program breaks it). \$\endgroup\$
    – user62131
    Dec 10, 2016 at 15:27
-2
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Prelude:

Joke languages are allowed.
Submissions' scores will vary depending on whether they'll be made in a joke language, golfing language or a Turing complete language, don't worry if your score is high just because you chose a TC language.
That being said, let's get right into the challenge...

Challenge:

Make a program as close as possible to the language name and document what it does in the description.

Scoring/rules:

(will assume a simple language I made up, called Printr that has only a print() command that can take a argument to print but doesn't have to)

  • Submissions that contain more than a 1/2 of whole language name in a string (ex. print("Printr")) are banned.
  • Submissions must not throw any errors/exceptions/warnings (writing to an error stream is okay though).
  • +1 for every char away from language's name (ex. print("r") is 4 chars away, (""), +4 points)
  • Submissions need to contain (at least once) the language name "in a row" excluding nonalphanumeric characters and ignoring case (ex. print(" *@)!R") is okay, print("lolz R") is not okay)
  • Duplicates of the name will be counted as other characters (ex. print("r") print("r") is still 4+1 [space]+10=15).

By looking as close as the language I mean having the least score (since scoring is based on other characters than the language name itself.

Example:

Printr, score 4:

print("r")

This program prints "r" then quits.

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7
  • \$\begingroup\$ is it allowed to throw an error? \$\endgroup\$
    – FlipTack
    Dec 18, 2016 at 14:00
  • \$\begingroup\$ @Flp.Tkc, good question, errors shouldn't be allowed (syntax error be like). \$\endgroup\$ Dec 18, 2016 at 14:07
  • \$\begingroup\$ What about a warning to STDERR? Stray error output is allowed by default on meta... \$\endgroup\$
    – FlipTack
    Dec 18, 2016 at 14:19
  • \$\begingroup\$ @Flp.Tkc, should be okay. \$\endgroup\$ Dec 18, 2016 at 14:24
  • \$\begingroup\$ ><>, in ><>, score 0, infinite loops. \$\endgroup\$ Dec 18, 2016 at 15:56
  • \$\begingroup\$ or actually if we're excluding non-alphanumeric characters, this could also be golfed down to > or empty depending on if outputting "something smells fishy..." is a valid program. \$\endgroup\$ Dec 18, 2016 at 16:00
  • \$\begingroup\$ in brainfuck you can just write brainfuck and it won't do anything... \$\endgroup\$
    – FlipTack
    Dec 19, 2016 at 17:31
-2
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Print number of possible values of X if:

  • Code 1: X is dividable by 3, X contains the number 3 and input() < X < 10000
  • Code 2: X is dividable by 7, X contains the number 2, X doesn't contain the number 3 and input() < X < 5000

Sub-Challenge:

Do the same but instead of printing the number, print the values


Disclaimer: This is my first code golf challenge, and it's very simple, but could bring up some really short answers and cool languages

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  • \$\begingroup\$ First thing: Sub-challenges are not a good idea. People will write the shortest code they can and just disregard the sub-challenge. \$\endgroup\$ Jan 16, 2017 at 19:49
  • \$\begingroup\$ Should you output the sum of the numbers from both two bullet points, in one? I don't think it benefits the challenge to have two different upper limits. I can see why you want it there, but I personally don't think it's a good thing. This needs some good test cases. \$\endgroup\$ Jan 16, 2017 at 19:52
  • \$\begingroup\$ Those were actually different puzzles, sorry! \$\endgroup\$
    – enduity
    Jan 17, 2017 at 12:10
  • \$\begingroup\$ Two different independent puzzles in one challenge is not a very good idea either I'm afraid. I think it would be better to use the same upper limit and require the numbers from both 1 and 2 together, I.e. the union of the two sets. \$\endgroup\$ Jan 17, 2017 at 12:23
-2
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[please suggest a name]

Mark got an idea of making a path finding algorithm for auto driving vehicles.

Unfortunately, Mark doesn't yet know about programming, so he decided to get help from the code golfers.


How should it work?

First, we input how many 'nodes' there are. we call it 'N', and its an integer up to 16 bit values.

Second, we input what nodes are connected to each nodes, and the length of the connection. for example, if the diagram is

(1)-5-(2)-2-(3)

the input should be

2 5  //node 1 is connected to node 2, and the length is 5
1 5 3 2 //node 2 is connected to node 1 and the length is 5. and its also connected to node 3, and its length is 2.
2 2  //node 3 is connected to node 2, and the length is 2.

then, finally, the starting node, and the final node. they are inputted as node numbers.

Your code should output the path of the shortest way to go from the start to the final node.

Examples

Input:

3
2 5
1 5 3 2
2 2
1 3

Output:

1->2->3

Explanation:

(1)-5-(2)-2-(3) starts from 1, and ends in 3. there is only one path, and it is the answer.


Specs

Standard rules apply.

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9
  • \$\begingroup\$ Possible duplicate. And another related question. Suggested tags for this challenge: graph-theory and path-finding \$\endgroup\$ Jan 17, 2017 at 9:35
  • \$\begingroup\$ Not a duplicate. Though related, clearly not a duplicate. \$\endgroup\$ Jan 17, 2017 at 10:32
  • 2
    \$\begingroup\$ By the standards of this site, it is a duplicate. \$\endgroup\$ Jan 18, 2017 at 11:48
  • \$\begingroup\$ Proof of duplicate? \$\endgroup\$ Jan 18, 2017 at 11:50
  • 2
    \$\begingroup\$ Currently the only differences are that not all nodes are necessarily connected and the specified input format. However both input formats are tight and string based, so I'd like to see this challenge with a loosened input format, e.g. allow all reasonable input formats for a weighted graph. \$\endgroup\$
    – Laikoni
    Jan 18, 2017 at 11:53
  • \$\begingroup\$ Okay, thanks for the suggestion. @Laikoni \$\endgroup\$ Jan 18, 2017 at 11:55
  • \$\begingroup\$ The way we identify duplicates on this site is to ask "Can answers from one question be copied over to the other with little or no modification and still be competitive?" \$\endgroup\$ Jan 19, 2017 at 7:09
  • \$\begingroup\$ @trich Seems legit, but those two question have quite of a difference, and second, I have came up to this idea all by myself, and being tagged as dupe, seems a tad unfair. \$\endgroup\$ Jan 19, 2017 at 12:12
  • 2
    \$\begingroup\$ Being marked as duplicate doesn't mean "This is a bad challenge", it just means "This challenge has already been posted". This is a good challenge idea, but we only host each challenge once, so that all the answers are in one place. \$\endgroup\$ Jan 19, 2017 at 13:42
-2
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Generate "N" random numbers which their sum is exactly "N"

Your goal is to generate N pseudo-random numbers R, then sum or subtract all the R togheter and obtain as result N.

Rules:

  • You get N from standard input as integer number, such as N <= 1000.
  • You can't perform operations like sum 100 times 1, 50 times 2, or similar...
  • R shall be generated in any reasonable non-deterministic way
  • R shall be integer such as 0 <= R <= N.
  • R can't have a constant value each time you generate it. For example you can't generate R with methods like R = rand(1,2) with the result that 1 <= R < 2 (R is constantly always =1), and then sum R 100 times.
  • You can perform only sums or subtractions of the generated R's.
  • You have to sum or subtract the newly generated R to the total of R's.
  • Standard loopholes are forbidden.
  • This is so the shortest code wins.

Example 1:

  1. Get N=100 from standard input.
  2. Generate 100 pseudo-random integer numbers R such as 0 <= R <= 100.
  3. Sum or subtract all the R and obtain 100(N) as result.

Example 2:

  1. Get N=20 from standard input.
  2. Generate 20 pseudo-random integer numbers R such as 0 <= R <= 20.
  3. Sum or subtract all the R and obtain 20(N) as result.

Not-so-smart-but-working example in C#:

using System;           
public class Program {
    public static void Main() {
        int S = 0, N, R = 1, X;
        int INPUT = Int32.Parse(Console.ReadLine());
        Random rnd = new Random();
        for (int I = 1; I < (INPUT+1); I++) {
            X = (INPUT+1) - I;
            if (I == INPUT && S == INPUT) {
                R = 0;
            }
            N = rnd.Next(R, X);
            if (S <= INPUT) {
                S = S + N;
            } else {
                S = S - N;
            }
            Console.WriteLine("I = {0}      N = {1}     S = {2}", I, N, S);
        }
    }
}

Test online

Tags:

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13
  • \$\begingroup\$ I don't understand what the goal is. If my program accepts the number 20, I have to generate 20 random numbers that sum to 20? So I generate random real numbers? Integers? Positive integers? Positive-or-zero integers? \$\endgroup\$ Jan 19, 2017 at 15:27
  • \$\begingroup\$ "You get N from standard input as integer" and "N shall be generated in any reasonable non-deterministic way" seem incompatible. If these are referring to two different things, then it would be clearer to not call them both N. \$\endgroup\$ Jan 19, 2017 at 15:42
  • 1
    \$\begingroup\$ It's not clear to me what your working definition of "random number" is, especially given that the system to be implemented has fewer degrees of freedom than "random" numbers. For a question about random numbers to be well specified it should state the distributions to be followed (modulo limitations of PRNGs). \$\endgroup\$ Jan 19, 2017 at 21:17
  • \$\begingroup\$ @GabrielBenamy Yes you understood correctly the challenge. I changed it adding more specs and more details. If you have further doubts please let me know. \$\endgroup\$
    – Mario
    Jan 20, 2017 at 8:03
  • \$\begingroup\$ @trichoplax Thanks for your comment. I edited the question to make it more clear with more details and specifications. Please let me know if I can improve it in a better way. \$\endgroup\$
    – Mario
    Jan 20, 2017 at 8:04
  • \$\begingroup\$ @PeterTaylor I am not sure I get what you mean, probably they are too advanced concepts for me :) Anyway I largely edited the question to make as more clear as possible. If you think it needs to be improved please give me your suggestions on how to make it a more clear and better challenge. \$\endgroup\$
    – Mario
    Jan 20, 2017 at 8:07
  • \$\begingroup\$ What about cases where it is impossible to sum/subtract to R? For example: N=5, R=[0,1,1,1,1]. \$\endgroup\$
    – Emigna
    Jan 20, 2017 at 9:46
  • \$\begingroup\$ @Emigna if you try my C# example it works for N=5. \$\endgroup\$
    – Mario
    Jan 20, 2017 at 11:22
  • 2
    \$\begingroup\$ If random distributions are too advanced a concept for you then I think you should abandon the idea of trying to post a question about sums of random variables. \$\endgroup\$ Jan 20, 2017 at 11:23
  • \$\begingroup\$ The explanation is still unclear, and needs work in itself. Separately from that, I recommend example inputs and outputs (literal output rather than explanation). The specification should be unambiguous before seeing the examples, and then the examples should come afterwards to confirm correct understanding of the spec. At present I believe the intention is to output an expression containing N integers, each added or subtracted, each in the range [0, N], evaluating to N, and for the integers to be randomly distributed amongst those that meet these criteria. \$\endgroup\$ Jan 20, 2017 at 11:55
  • \$\begingroup\$ @trichoplax thanks for your comments and explanations, although the challenge seems clear to me it's obvious that I am missing something that goes beyond my knowledges. I think I will delete the post maybe reviewing it. \$\endgroup\$
    – Mario
    Jan 20, 2017 at 12:24
  • \$\begingroup\$ @PeterTaylor I got an idea and I posted it here to have feedbacks about it and maybe help or suggestions for improvement, but as I said obviously I am missing something that I haven't studied. I'll delete the challenge. \$\endgroup\$
    – Mario
    Jan 20, 2017 at 12:28
  • \$\begingroup\$ A post always seems clear to the person who wrote it, because they already knew what they meant. That's why the sandbox is so useful - I can't tell if my challenge is really clear until I show it to other people. Being unclear doesn't make it a bad challenge. It just means it needs rewording before it will be ready. Here in the sandbox you don't need to delete. You can simply keep making adjustments and getting feedback until it's ready. \$\endgroup\$ Jan 20, 2017 at 13:17
-2
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Make the Shape

This is a wider version of this question, so it may not get posted.

Given a single character e.g. H or ! and a sequence of letters e.g. abcdefghijklmnopqrstuvwxyz you must output the character drawn using the letters in the sequence. If you need more letters, just loop through the sequence again.

Input

A single character, c. You can assume that it will always be one character.

A sequence of charaters s. All characters must be printable ASCII letters.

Output

c made up of the letters in s

Examples

Let's say c = "H" and s = "abcdefghijklmnopqrstuvwxyz". The correct output would be

ab   cd
ef   gh
ij   kl
mnopqrs
tuvwxyz
ab   cd
ef   gh
ij   kl

c = "!" and s = "hello, world" outputs

he
ll
o,
 w
or

ld

Rules

  • Shortest code (in bytes) wins
  • Any correct output may be outputted i.e. either one of the example
  • c must be one character
  • Leading/trailing newline is acceptable
  • Standard golfing loopholes apply
  • Lines must be 2 characters thick
  • You must use every letter in s at least once to make c
  • Either a full program or a function, NO snippets
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9
  • \$\begingroup\$ You need definitive rules about the shape and size of each letter or else this will probably be closed as unclear. \$\endgroup\$
    – FlipTack
    Jan 22, 2017 at 17:35
  • \$\begingroup\$ This is similar to another question, that I can't find at the moment. It's about making words from other words, nested n times. \$\endgroup\$
    – wizzwizz4
    Jan 22, 2017 at 18:42
  • \$\begingroup\$ "Both inputs must be surrounded by "" - um, why? This isn't a parsing challenge. Input should be allowed to be taken in any reasonable format, as is the code-golf standard. You should only break the IO defaults if it is of paramount importance to your challenge, whereas it just looks like a trivial pointless rule here. \$\endgroup\$
    – FlipTack
    Jan 22, 2017 at 18:49
  • \$\begingroup\$ It was to clarify for languages that need " at input. I'll change it. \$\endgroup\$
    – user63571
    Jan 22, 2017 at 19:06
  • \$\begingroup\$ Also whoever downvoted can you tell me why? I might be able to improve the question \$\endgroup\$
    – user63571
    Jan 22, 2017 at 23:26
  • \$\begingroup\$ If you want to limit it to alphabetical characters, you may use my list of ASCII art: codegolf.stackexchange.com/questions/99913/5-favorite-letters \$\endgroup\$ Jan 23, 2017 at 19:36
  • \$\begingroup\$ Also, Jack, they're probably downvoting because of how open-ended it is. You haven't defined the layout of any of the characters beyond H!. \$\endgroup\$ Jan 23, 2017 at 19:52
  • \$\begingroup\$ Thanks for the help \$\endgroup\$
    – user63571
    Jan 23, 2017 at 20:24
  • \$\begingroup\$ If you want to reply to someone, tag them - @JackBates \$\endgroup\$
    – FlipTack
    Jan 23, 2017 at 22:49
-2
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Why is it buff...........ering?

As the Internet isn't perfect, occasionally the videos we watch start buffering. When this happens, I get very annoyed. As the wait gets longer, I get even more annoyed.

Your task is to write a function or program that waits a random amount of time and then outputs an angry message with the level of anger increasing the longer it waits

Input

None

Output

An angry message and the length of the wait

Examples

Time waited: 5 seconds

Angry message: Never mind!

Time waited: 30 seconds

Message: I hate YouTube!

Time waited: 1 minute

Message: Die computer, die!!!

This code is an example in Python, obviously ungolfed.

import time
import random
messages = ["Never mind!","Getting annoyed","I hate YouTube!","Die computer, die!"]
slept = random.randint(5,60)
msg_num = slept//len(messages)
time.sleep(slept)
print("Time waited:",slept)
print(messages[msg_num])

Rules

  • Messages are up to you
  • The time to wait ranges from 5 seconds to 1 minute
  • Standard code-golf rules apply
  • Standard code-golf loopholes are disallowed
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1
  • 1
    \$\begingroup\$ This won't work as code-golf because it'd mostly be about golfing the angry messages in question, and golfing English is always highly subjective; how angry does the message have to be before it qualifies as "angry"?. I don't really see it working with another victory condition, either. \$\endgroup\$
    – user62131
    Jan 25, 2017 at 19:14
-2
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Don't know what to call this

Some people here may be familiar with Euler's identity. If not click the link

Now you know what the equation is, what if we change it slightly? No-one like to imagine numbers so instead we're going to use an unknown number x.

So first we get rid of i and replace it with x. Now we all know that i*i is -1. But with i gone, so must -1. Let's change it to x^2 instead. However this means there is only one solution. So instead let's make it x^random_integer(0,x) to spice it up

If we change the equation from e^(i*π) - 1 = 0 to e^π / (x^random_integer(0,x)) = 0 we now have something we can work with.

Given an integer or float as input, x, calculate if it satisfies the above equation. Your code should result in True or False or the closest equivalent.

Input

A single number between -(2^32-1) or what ever your language can handle and 2^32-1 or whatever it can handle called x

Output

A Boolean that says whether the number satisfies the above equation and the random number that is picked

Rules

• The code must calculate if x fits this equation rather than take it from an outside source

• Results in True if within -0.1 and 0.1

• This is code-golf so shortest code (bytes) wins

• Builtins that postdate this challenge are allowed unless they are specifically designed for the sole purpose of winning this challenge

• Standard code-golf loopholes apply

Examples

x = 5
e^π / 5 ^ rand(0,5) = 0
rand(0,5) = 2
results False (0.92)

x = 6
e^π / 6 ^ rand(0,6) = 0
rand(0,6) = 4
results True (0.01)
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20
  • 2
    \$\begingroup\$ Most languages don't have accurate enough floats to be able to compare the two sides as equal. As such, they could just arbitrarily return false. You might want to add a precision level. (Also, I assume there are only finitely many solutions anyway…) \$\endgroup\$
    – user62131
    Jan 25, 2017 at 20:19
  • \$\begingroup\$ Sorry I'm a bit all over the place. I'm not perfect with the maths and keep changing it so it might work :/ \$\endgroup\$
    – user63571
    Jan 25, 2017 at 20:30
  • \$\begingroup\$ I found something that works! :) \$\endgroup\$
    – user63571
    Jan 25, 2017 at 20:44
  • \$\begingroup\$ Check rules number 2 and the examples \$\endgroup\$
    – user63571
    Jan 25, 2017 at 20:55
  • \$\begingroup\$ According to your equation the rule number two has both of those as false, 0.92 and 0.64 are not 0.1 away from 0. Random numbers are also usually considered a bad thing to be using in the challenges. \$\endgroup\$ Jan 25, 2017 at 20:56
  • \$\begingroup\$ Sorry got the example wrong, fixing now. I thought it was to 1 while I did the first one :/ \$\endgroup\$
    – user63571
    Jan 25, 2017 at 20:57
  • \$\begingroup\$ e^π / (x^random_integer(0,x)) = 0 requires e^π = 0 (false) or x^random_integer(0,x) to be infinite (in which case it's not strictly true, but it is in the limit). The only way it's going to be infinite with real x and non-negative random_integer(0, x) is if x is infinite. Therefore the explanation of the task effectively states that the task is to return False. It's very confusing that the rules then contradict this. \$\endgroup\$ Jan 25, 2017 at 23:06
  • \$\begingroup\$ @PeterTaylor If you look at rule 2, it explains how to beat this. Also check the example true one \$\endgroup\$
    – user63571
    Jan 25, 2017 at 23:09
  • \$\begingroup\$ My point is precisely that rule 2 and the second example contradict the problem statement, which therefore needs fixing. \$\endgroup\$ Jan 25, 2017 at 23:26
  • \$\begingroup\$ I'm not sure if I understand you correctly. The problem is to find if x satisfies the equation e^pi / x^rand(0,x) = 0 plus-minus 0.1. Rule 2 and the examples both follow this problem and output the correct result. \$\endgroup\$
    – user63571
    Jan 25, 2017 at 23:32
  • \$\begingroup\$ The problem statement clearly says "Given an integer or float as input, x, calculate if it satisfies the above equation" where the above equation is e^π / (x^random_integer(0,x)) = 0. Then half a screen later the rules say, in effect, "Actually, what I said earlier was a lie." That's not the way to write a clear specification. One way to fix it would be to change the problem statement to say "If we change the equation from e^(i\*π) - 1 = 0 to e^π / (x^random_integer(0,x)) = 0 we now have no solutions, so let's make it an inequality: abs(e^π / (x^random_integer(0,x))) <= 0.1". \$\endgroup\$ Jan 26, 2017 at 8:34
  • \$\begingroup\$ What rules make it say "What I said earlier was a lie"? \$\endgroup\$
    – user63571
    Jan 26, 2017 at 15:34
  • \$\begingroup\$ Loophole found: Consider a/(x^b): For a non-zero a, this fraction gets closer to 0 as x^b gets closer to infinity, where higher values for b result in outcomes closer to 0. As such, if you want to check if the fraction is smaller than some other value c if b goes from 0 to x, you only have to check if a/(x^x) < c, because if that's false, there will be no value for b smaller than x for which it is true. \$\endgroup\$
    – Luke
    Jan 26, 2017 at 19:03
  • \$\begingroup\$ What's your point? Are you suggesting I change it in some way? \$\endgroup\$
    – user63571
    Jan 26, 2017 at 19:28
  • \$\begingroup\$ You should at least remove the word "random" from the question, since this has nothing to do with randomness. The question is stated a lot more complicated than it actually is. \$\endgroup\$
    – Luke
    Jan 26, 2017 at 20:07
-2
\$\begingroup\$

Count My Change

Your task is to sort an array containing the strings "quarter", "dime", "nickel", and "penny" any number of times in no specific order and sort them so that they are in this order: quarter dime nickel penny (in other words, greatest to least monetary value).


Rules

  1. Your program must take an array as input containing the names of U.S coins and sort them from greatest to least by monetary value.
    • For those who are not from the U.S or don't use change, the values of U.S coins, from greatest to least, are:
      • Quarter: 25 cents
      • Dime: 10 cents
      • Nickel: 5 cents
      • Penny: 1 cent
  2. You may sort this array in any way you wish, as long as the output is ordered by the monetary values shown above.
  3. Input can be taken in any way, be it command-line arguments or STDIN.
  4. An input array would be all lowercase strings, something like this:
    • quarter dime nickel nickel quarter dime penny penny
  5. If there is a value in input that is not a quarter, dime, nickel, or penny, your program should output 0 .

Test Cases

  • penny nickel dime quarter should become: quarter dime nickel penny
  • nickel penny penny quarter quarter quarter dime dime dime dime
  • quarter dime nickel nickel quarter dime penny penny
  • euro quarter nickel dime would output 0 because a euro is not U.S currency.
  • esac (not a test case, I just like bash a lot)

This is , so standard rules & loopholes apply.

\$\endgroup\$
2
  • \$\begingroup\$ Test cases please? \$\endgroup\$ Feb 3, 2017 at 16:01
  • \$\begingroup\$ @MistahFiggins On it \$\endgroup\$
    – ckjbgames
    Feb 3, 2017 at 16:26
-2
\$\begingroup\$

A simple challenge: Shortest program that takes the longest to compile.

\$\endgroup\$
4
  • 1
    \$\begingroup\$ What's the scoring requirement (i.e. how will programs be scored)? Who's machine will this be run on? \$\endgroup\$
    – clismique
    Feb 11, 2017 at 1:43
  • \$\begingroup\$ It's too broad of a challenge; are infinite loops allowed? To reiterate what Qwerp-Derp said, how will it be scored? Longest to compile -- what if it's an interpreted language? \$\endgroup\$
    – user42649
    Feb 11, 2017 at 1:47
  • \$\begingroup\$ @AlexL.: languages without a compiler would be excluded. \$\endgroup\$
    – jmoreno
    Feb 11, 2017 at 1:57
  • \$\begingroup\$ I still believe this is not a good challenge because it is unclear what you are asking and it is too broad. \$\endgroup\$
    – user42649
    Feb 11, 2017 at 2:01
-2
\$\begingroup\$

What in the heck just happened?

I want you to write a program that will bleep out the H-word, regardless of where it occurs, whether it is inside of another word or a stand-alone word, whether capitalized or not.

Input and Output

The inputs and outputs of your program may be any of the following: an array of characters, a string, or any other standard data structure which does the job. However, the output must match the case of the input.

Samples:

In the format of Input: Output
A Shell gas station : A Sheck gas station
Hell is a very bad place to be. : Heck is a very bad place to be.
Ella fell and Nelly dug a well. : Ella fell and Nelly dug a well.
Chellsea Thell bought shells. : Checksea Theck bought shecks.

Standard loopholes apply, and the entry submitted by [insert date here] with the lowest number of bytes as defined by the Meta will win.

\$\endgroup\$
3
  • 2
    \$\begingroup\$ I can't say for sure, as I don't have an exact reference, but I'm pretty sure a simple find and replace challenge has been done before. \$\endgroup\$
    – ATaco
    Feb 13, 2017 at 0:19
  • 4
    \$\begingroup\$ "Hell" and "heck" are both "H-words", so you need to be clearer. Also, I feel like this is a duplicate. Though these are milder swear words, I think someone did one with swear words in general and it got deleted. If you're going to make a find/replace challenge, it's simple enough to make it about something else. \$\endgroup\$
    – mbomb007
    Feb 13, 2017 at 0:19
  • \$\begingroup\$ Ah, I see. So, are you saying I should change what's being replaced or what my idea is? \$\endgroup\$ Feb 14, 2017 at 0:50
-2
\$\begingroup\$

Digitless digits

Introduction

What we have feared for so long has finally happened, the robots have gained counsciousness and have risen. There has been a war, a global and violent one, and humans have been defeated.

Calcubot, the fearless and tyrannic robot leader, has established a new world order, and its first decree as Supreme World Leader has been to forbid all non-AI entities from using numbers.

But, as it's always been the case in oppressive regimes, the Resistance has begun to form. Their first act of rebellion is to print leaflets with numbers on them. However, as the secret robot police is everywhere and can see everything, especially computer programs, these leaflets have to be inconspicuous and must not use numbers within their construction.

Challenge

The goal of the challenge is to print all digits from 0 to 9 without using them in the source code.

Example Input and Output

Input:

There is no input required

Output:

0123456789

Restrictions

The source code must not use one of the following characters : 0123456789.

Also, as this is a challenge, your code must be inventive, i.e. please refrain from using prebuilt classes with all the digits or other standard loopholes. You might still try to make your source code the shortest possible, but not at the expense of inventivity.

The answer with the most upvotes after 7 days will be declared the winner, the time of submission will be used as a tie-breaker.

For example, this is what I had in mind for a PHP solution :

$i = (int)false;
foreach(str_split('abcdefghij') as $k) {
    echo $i++;
}

Meta questions

  • Has this challenge already been done ? I feel like it's not a revolutionary idea and am afraid someone has thought about it before.
  • Could you give me examples of "forbidden loopholes", as I don't really now all the esoteric programmation languages you guys are using.
  • Finally, do you think it's a good challenge ? And if not, what could be done to improve it ? That's my first proposed challenge, so I'm aware there might be blatant errors or misses.
\$\endgroup\$
9
  • \$\begingroup\$ Regarding loopholes, you can link to this: Loopholes that are forbidden by default \$\endgroup\$
    – Emigna
    Feb 22, 2017 at 10:38
  • 1
    \$\begingroup\$ If you intend to ban "boring" answers, like predefined character classes you need to be very careful as writing a Do X without Y challenge can be very hard to get right. \$\endgroup\$
    – Emigna
    Feb 22, 2017 at 10:39
  • 1
    \$\begingroup\$ Code-challenge doesn't provide an objective winning criteria by default so you need to explicitly specify one. \$\endgroup\$
    – Emigna
    Feb 22, 2017 at 10:40
  • \$\begingroup\$ Thank you for your input @Emigna. I think most upvotes could be the winning criterion, since I don't want it to be a code-golf challenge. I'll edit and add the loopholes link. \$\endgroup\$
    – roberto06
    Feb 22, 2017 at 10:45
  • 1
    \$\begingroup\$ Related: Print all ASCII alphanumeric characters without using them, Print every printable ASCII character without using it. This challenge is in between those two, and I'm not sure if there's space for a third (because many answers are likely to end up similar to answer to one of those). \$\endgroup\$
    – user62131
    Feb 22, 2017 at 10:47
  • \$\begingroup\$ @ais523 I don't think the second example you're giving could be considered as a dupe, since only one character is forbidden for each execution. As for the first one, I see two major differences with my propose challenge : letters are allowed here, which would make it easier for submitters to create a "real" function, and this is not a code-golf challenge, which might reduce the numbers of answers written in esoteric languages such as Brainf**k. I hear what you're saying, but IMO, this challenge could find its space, as I'm really looking for readable and inventive solutions. \$\endgroup\$
    – roberto06
    Feb 22, 2017 at 10:57
  • \$\begingroup\$ Oh, I missed the victory condition. A "most upvotes" victory condition uses the popularity-contest tag, not code-challenge. Popularity contests historically tend not to do that well here, as a notable proportion of the site's userbase dislikes them (although many other users are fine with them). \$\endgroup\$
    – user62131
    Feb 22, 2017 at 10:59
  • \$\begingroup\$ The winning criterion could be something else, I set it to "most upvotes" because I supposed "The winner is whosever solution I find the most interesting" wouldn't have been a good criterion. I'm open to ideas though, what do you think could be an accurate and impartial victory condition (still, I'd rather not use "shortest code" as the criterion) ? \$\endgroup\$
    – roberto06
    Feb 22, 2017 at 11:04
  • \$\begingroup\$ "Inventivity" is not objective. The obvious way to do this in CJam neither uses prebuilt classes with all the digits nor any other standard loophole, is two characters long, and by virtue of being obvious is probably not "inventive". If you feel the need to try to forbid non-inventive answers, that suggests to me that you already know that the answer to "Is it a good challenge?" is "No, it's not". \$\endgroup\$ Feb 27, 2017 at 14:38
-2
\$\begingroup\$

You should log out


In the programming language of your choice, log off the currently logged in user.

Rules and clarifications:

  • After running the program the user should be taken to the login screen of the appropriate operating system, where they can re-login
  • You can assume that no programs are running that would block the logout process with popups
  • Solutions that just restart the computer to get to the login page are not allowed
  • Always specify which OS / architecture / environment your code runs on
  • Standard loopholes are forbidden

This is code-golf, so the lowest amount of bytes wins


Sandbox questions:

  • I'm unsure how to discourage answers where logout is achieved by expecting the code to be called from bash using "exec", or other solutions where logout is not actually initiated by the program, but by the caller process
  • Do we have a tag for architecture dependent questions?
\$\endgroup\$
7
  • \$\begingroup\$ @LliwTelracs: "After running the program the user should be taken to the login screen of the appropriate operating system", no shutdown will not take you there. Also "Solutions that just restart the computer to get to the login page are not allowed" \$\endgroup\$
    – SztupY
    Mar 2, 2017 at 15:55
  • \$\begingroup\$ Logout is shutdown with option l. The shutdown challenge was shutdown with option s \$\endgroup\$ Mar 2, 2017 at 16:06
  • 2
    \$\begingroup\$ The only difference for linux systems is that the command used will change. All the programs will access the OS commands the same way, which means that all the answers will be portable by changing one piece. \$\endgroup\$ Mar 2, 2017 at 16:12
  • 1
    \$\begingroup\$ If you made it prevent me from logging in to PPCG my overall productivity would skyrocket \$\endgroup\$
    – user63187
    Mar 2, 2017 at 16:17
  • \$\begingroup\$ That's just a browser extension. Just close any PPCG tabs. \$\endgroup\$ Mar 4, 2017 at 16:11
  • \$\begingroup\$ @fəˈnɛtɪk: There may be a shorter solution on Linux by killing/crashing X (which with some graphical desktop environments, is how logging out is implemented in the first place). I don't think that's enough to make the question substantially different, though. \$\endgroup\$
    – user62131
    Mar 14, 2017 at 5:07
  • \$\begingroup\$ bash + utilities, 14 bytes: pkill -u $USER \$\endgroup\$
    – anna328p
    Apr 7, 2017 at 2:33
-2
\$\begingroup\$

Google search result short summary

Intro

When you search in google, it always shows you a result with a sample text from the found webpage.

For example if you search for "Madonna greatest vinyl", google will show you one line link, and below a short excerpt from that found webpage:

Madonna Greatest Hits Records, LPs, Vinyl and CDs
Madonna - Greatest Hits Volume 2, Madonna, Greatest Hits ... vinyl Is Fully Restored To As Near New Condition As Possible. Shipping & Multiple Order D..

Task

Imagine yourself you work for google and you have to write a program/function which takes in:

  • a string containing many words (the webpage content)
  • list of searched words (at least 3)

and returns the shortest excerpt of given string (webpage) containing all searched words.

Example

Given this webpage content:

This document describes Session Initiation Protocol (SIP), an application-layer
 control (signaling) protocol for creating, modifying, and terminating
 sessions with one or more participants. These sessions include 
 Internet telephone calls, multimedia distribution, and multimedia conferences.

and these searched words:

calls, sessions, internet

the program should return:

sessions include Internet telephone calls
, as this is the shortest substring containing all 3 searched words. Note that one more substring contains these 3 words, it is "sessions with one or more participants. These sessions include Internet telephone calls", but it is longer, so it was discarded.

Rules

  • If the string is empty, return empty string
  • If all searched words are not found in given string, return empty string
  • Search is ignoring letters case
  • At least 3 words need to be specified for searching
  • The returned string may contain the searched words in different order than specified

Challenge

Write the fastest code. It's for google, right? Remember that repeatable strings comparison is very expensive.

\$\endgroup\$
4
  • \$\begingroup\$ There is not always a short summary. \$\endgroup\$ Mar 10, 2017 at 18:19
  • 1
    \$\begingroup\$ Fastest code is going to be tough to measure on this, as even pretty large chunks of text will still result in very small amounts of time. \$\endgroup\$ Mar 10, 2017 at 18:50
  • 1
    \$\begingroup\$ You should include more test cases, especially large ones if you want to score by fastest code. \$\endgroup\$
    – Laikoni
    Mar 12, 2017 at 19:04
  • \$\begingroup\$ @fəˈnɛtɪk There is, if all searched words are found in the given string. (For some definitions of short...) \$\endgroup\$
    – wizzwizz4
    Oct 7, 2017 at 11:22
-2
\$\begingroup\$

It's 42!

This challenge is to code golf a program that proves that the next number in a pattern is 42 based on the website Actually it's 42.

In your program, the user inputs a pattern of numbers and it has to output the equation that proves that the next number is 42.

For example, the user inputs the pattern 1, 2, 3, 4, 5 the output is something like:

f(n)=9/2(n^2)−17(n)+29/2

Because f(6) = 42

Your program can output any form of an equation that makes the next value in the equation 42.

Your outputted equation must be able to also output the numbers in the original input also in the form of a variable. For example, in this equation, if you put 1 as the number input you get the number 1.

Your program cannot make any HTTP requests to APIs, in other words, all the calculations must be done in the program.

Good Luck!

\$\endgroup\$
10
  • \$\begingroup\$ You might want to make your question a bit clearer. Explain input format is first n terms of a sequence. Seems like an interesting idea though \$\endgroup\$ Mar 13, 2017 at 1:38
  • 1
    \$\begingroup\$ It seems to me like this challenge is two disjointed parts. 1) is recognizing the pattern of numbers and determining the next, and 2) is turning an arbitrary n into 42. For 1, you should be clearer about which patterns must be recognized (arithmetic sequences? Geometric sequences? More?), and for 2 you probably need more restriction. For example, what's stopping me from outputting n - n + 42 regardless of input? \$\endgroup\$
    – DJMcMayhem
    Mar 13, 2017 at 1:59
  • \$\begingroup\$ @DJMcMayhem Good point that I have not thought about. \$\endgroup\$
    – arodebaugh
    Mar 13, 2017 at 10:33
  • \$\begingroup\$ Making edits to it \$\endgroup\$
    – arodebaugh
    Mar 13, 2017 at 10:34
  • \$\begingroup\$ @DJMcMayhem You can't always output n - n + 42 because it won't fit the previous numbers in the sequence. That is if OP wants the challenge to be to implement the functionality of the linked site. \$\endgroup\$
    – Laikoni
    Mar 13, 2017 at 13:07
  • \$\begingroup\$ However the algorithm used by the site is (according to the why page) is to solve a system of linear equations, and this has been done before: codegolf.stackexchange.com/questions/22573/… \$\endgroup\$
    – Laikoni
    Mar 13, 2017 at 13:10
  • \$\begingroup\$ @laikoni Oh, I thought the sequence was the list of inputs, not the list of outputs. I completely misunderstood the challenge. \$\endgroup\$
    – DJMcMayhem
    Mar 13, 2017 at 13:17
  • \$\begingroup\$ Looking at the sole example in the question, the challenge seems to be to output a random function independently of the input. Is this correct? If so, ditch the input. If not, it's a dupe \$\endgroup\$ Mar 13, 2017 at 13:50
  • \$\begingroup\$ @PeterTaylor the input is required to be taken part in the equation. Hense the rule. You have to output the equation DJMcMayhem \$\endgroup\$
    – arodebaugh
    Mar 13, 2017 at 14:09
  • \$\begingroup\$ @Laikoni Well this makes an equation so it does not have to do with that. \$\endgroup\$
    – arodebaugh
    Mar 13, 2017 at 14:10
-2
\$\begingroup\$

The Mnemonic Major System

People frequently need to memorize long strings of digits, such as telephone numbers. Fortunately, the mnemonic major system, which uses sounds to represent digits, and words to represent strings of digits, can help.

  • /s/ and /z/ represent the digit 0
  • /t/, /d/, /θ/ and /ð/ all represent 1
  • /n/ represents 2
  • /m/ represents 3
  • /r/ represents 4
  • /l/ represents 5
  • /tʃ/, /dʒ/, /ʃ/ and /ʒ/ all represent 6
  • /k/ and /ɡ/ represent 7
  • /f/ and /v/ represent 8
  • and /p/ and /b/ represent the digit 9
  • For the purpose of this challenge, the sound /ŋ/, generally written as ng, counts as 27.

All other sounds can be used to create words, but do not represent any digits. Thus, the words Code Golf represent the digits 71 758. Since the mnemonic major system is a phonetic system, silent letters do not represent any digits. Thus, the word knight represents the number 21, not 7271. The letter x is pronounced /ks/, and thus represents the digits 70. On the other hand, most double consonants are not actually pronounced separately (e.g. mummy, chicken), and represent only one digit.

Challenge

Your task is to write a program or function that takes a string of digits in any convenient format as input and returns a mnemonic representation of those digits as output. The following rules must be observed:

  1. You must use real English words. Acronyms and abbreviations are not allowed. If in doubt, refer to an authoritative dictionary.

  2. Whenever possible, two or more digits must be represented by a single word. If the number of digits is odd, you may choose which digit, if any, stands alone (see examples). All two-digit numbers can be represented by English words.

You may use a built-in or external dictionary to search for suitable words.

This is code golf, so the shortest solution wins.

Example Input and Output

758
golf, kale fee, key leaf

0142710
strengths, suitor nugget saw, seat run key tease

2362185
unimaginatively, gnome gin devil, enmesh native lie
\$\endgroup\$
6
  • \$\begingroup\$ Getting the sounds from a word is not a task that computers can do properly due to the English language not actually following the rules it supposedly has. \$\endgroup\$ Mar 13, 2017 at 16:51
  • \$\begingroup\$ The supplied link to M-W.com is pretty useless. To make a reasonable question you should provide a link to a single file which includes a word list with phonetic representation in easily parseable form. That would also allow verification that the requested task is possible, which at present I doubt: are all 1000 possible three-digit groups really representable? E.g. 333 seems like a tough one to represent. \$\endgroup\$ Mar 13, 2017 at 16:58
  • 2
    \$\begingroup\$ On a separate issue, the calculation of pi has been done to death, so the interesting part of the question is the mapping from a sequence of digits to a sequence of words. On that basis I would recommend removing pi from the question and instead taking a sequence of digits as input, putting the focus squarely on the interesting part. \$\endgroup\$ Mar 13, 2017 at 16:59
  • 1
    \$\begingroup\$ On the dictionary issue, just make the program take the dictionary as an input (and let people use whatever dictionaries they want to test their program, given that you could get the answer you want by substituting your own). It's not like hardcoding the dictionary is possibly going to save bytes here, given that even languages with dictionaries built in would have a different dictionary to the one you wanted. \$\endgroup\$
    – user62131
    Mar 14, 2017 at 4:44
  • \$\begingroup\$ @PeterTaylor Thanks for your input. Whether all three-digit groups are representable is irrelevant for the question as is, since only three three-digit groups need to be represented. However, I think your proposed changes would improve the question. I will do some research on the problem of representing arbitrary three-digit numbers. \$\endgroup\$ Mar 14, 2017 at 6:19
  • \$\begingroup\$ @fəˈnɛtɪk Well, English spelling was pretty consistent when it was introduced around 1400. However, written language is generally more conservative than spoken language. While it is difficult to determine how a given word is pronounced, it is not so difficult to construct a word to match a given pronunciation. \$\endgroup\$ Mar 14, 2017 at 6:22
-2
\$\begingroup\$

Print the Previous Program

Specifications:

You must print the exact text of the previous answer without ever having a sequence of more than 5 letters in a row in your program that also show up in the previous answer (prevents hardcoding). Your program must only use UTF-8 characters.

You may repeat a language; however, you may not post twice in a row and no two of your consecutive answers may be from the same language class (different versions are treated as the same language).

The first language is to print the exact text "Hello, World!"

0-byte submissions are not allowed.

By the way, this is just a draft, it might be a dupe or really closely related, and probably has more holes in it than Swiss cheese so please give me any suggestions you have. Thanks.

Also, my drafted scoring system is something like bytes / answer_num where answer_num is which answer yours is (on a time scale).

\$\endgroup\$
12
  • \$\begingroup\$ "letters" isn't clear, because there are a bunch of Unicode characters that aren't letters. Requiring that no sequence of 5 Unicode characters can be repeated would be better. Additionally, it's traditional in answer chaining challenges for the first program to be provided in the challenge. \$\endgroup\$
    – user45941
    Mar 19, 2017 at 4:44
  • \$\begingroup\$ I don't like the 5 letters in a row thing, I think there should be more finegrained restrictions on hardcoding. Additionaly, someone could just do a couple of transformations on program text. \$\endgroup\$
    – anna328p
    Mar 19, 2017 at 4:47
  • \$\begingroup\$ I'm confused by this "prevents hardcoding" as hard-coding a string is exactly the problem statement. \$\endgroup\$
    – feersum
    Mar 19, 2017 at 5:13
  • \$\begingroup\$ @Mego Right, I meant characters. And also, if that's the case, I'll make a program to start off with then. Thanks! \$\endgroup\$
    – user42649
    Mar 19, 2017 at 16:47
  • \$\begingroup\$ @Mendeleev That is true. Do you have any suggestions? I'll keep thinking of better ways to restrict that. \$\endgroup\$
    – user42649
    Mar 19, 2017 at 16:48
  • \$\begingroup\$ @feersum Not quite, the problem statement is to print out the code of the previous answer without hardcoding it. \$\endgroup\$
    – user42649
    Mar 19, 2017 at 16:49
  • \$\begingroup\$ That doesn't make sense. \$\endgroup\$
    – feersum
    Mar 19, 2017 at 18:52
  • \$\begingroup\$ @feersum How so? The general idea is to generate the previous answer without hardcoding it (because that would be trivial), so it's kinda like a kolmogorov challenge in some sense... \$\endgroup\$
    – user42649
    Mar 19, 2017 at 18:54
  • \$\begingroup\$ What does "hardcoding" mean to you? Please give a definition. \$\endgroup\$
    – feersum
    Mar 19, 2017 at 18:57
  • \$\begingroup\$ @feersum In my definition, "hardcoding" means that you just put "print" and then the exact text you want printed. \$\endgroup\$
    – user42649
    Mar 19, 2017 at 18:59
  • \$\begingroup\$ We usually use "hardcoding" to refer to an answer that exploits a limited input range to avoid performaing an expected algorithm, e.g. for a Fibonacci question where the input is at most 20, writing a list of 20 Fibonacci numbers in the code. Here the task is not associated with any calculation at all. \$\endgroup\$
    – feersum
    Mar 19, 2017 at 19:05
  • \$\begingroup\$ Let us continue this discussion in chat. \$\endgroup\$
    – user42649
    Mar 19, 2017 at 19:06
-2
\$\begingroup\$

Display Haftseen table items - in Persian/Arabic characters

Theme : Jalali New Year 1397

Main Goal : Displaying non-ASCII characters correctly

Introduction

A typical Haftseen table consists 7 items which their names start with س (pronounced like S) and some additional items. It is set few days before the new year's day and it's kept till end of new year's holiday.

Challenge

Your program/function should display exactly 7 items from the list below :

سبزه
سرکه
سکه
سیب
سنبل
سمنو
سماق
سیر
سنجد

with right alignment, right to left typing, in an Arabic-compatible font, with each word displayed correctly, and a non-alphabetical character (,.- =+~?,newline etc) between each 2 words. The list must be displayed in a window, in terminal or similar.

\$\endgroup\$
7
  • \$\begingroup\$ I would be surprised if people didn't just output the string directly or with a built-in compression scheme. Say, in Bubblegum. \$\endgroup\$ Mar 20, 2017 at 9:19
  • \$\begingroup\$ @JanDvorak challenge is now changed to displaying it instead. i think it's hard enough now. \$\endgroup\$
    – user55673
    Mar 20, 2017 at 9:27
  • \$\begingroup\$ Same difference - most environments display the program output rather than ... doing anything else to it. \$\endgroup\$ Mar 20, 2017 at 9:28
  • \$\begingroup\$ @JanDvorak but AFAIK most environment won't display it correctly. do they? \$\endgroup\$
    – user55673
    Mar 20, 2017 at 9:30
  • \$\begingroup\$ TIO.run displays it just fine... \$\endgroup\$ Mar 20, 2017 at 9:32
  • \$\begingroup\$ @JanDvorak But it's not right alignment and it's aligned to left \$\endgroup\$
    – user55673
    Mar 20, 2017 at 9:35
  • 1
    \$\begingroup\$ If that's necessary, my language of choice would most likely be HTML+CSS. I thought you wanted the challenge to be about string compression, though, not choosing the right environment. \$\endgroup\$ Mar 20, 2017 at 9:38
-2
\$\begingroup\$

Code - Decode

Cops:

Your task is to write a program or functon wich otuputs encrypted alphabetic input. The same program or function has to be used to encrypt and decrypt messages as the case of ROT13

You have to post in your answer:

  1. Languaje and length of your program
  2. The encrypted output of the input "CODE GOLF"
  3. Two more examples of crypted - unencrypted strings

Example:

Bash, 30 chars

  1. "CODE GOLF" <=> "PBQR TBYS"
  2. "SHA" <=> "FUN"
  3. "Why did the chicken cross the road? Gb trg gb gur bgure fvqr!" <=> "Jul qvq gur puvpxra pebff gur ebnq? To get to the other side!"

You may post your program code an decpription of your crypting algorithm once is considered safe. Shortest uncracked answer wins.

Example:

tr '[A-Za-z]' '[N-ZA-Mn-za-m]'

This bash command crypts and decrypts messages shifting each letter 13 positions in the alphabet.

Robbers:

Your task is to write a program or function wich otuputs encrypted alphabetic input. The same program or function has to be used to encrypt and decrypt messages as the case of ROT13

Your code has to pass test cases posted on one of the COPS post. The user who cracks most wins.

Extra bonus if your code cracks more than one answer.

\$\endgroup\$
9
  • \$\begingroup\$ First cops and robbers challenge, pleas help me writing it nice. \$\endgroup\$
    – marcosm
    Apr 4, 2017 at 14:58
  • \$\begingroup\$ Just to be clear, is the goal of the robbers to crack the encryption algorithm that the cops create? \$\endgroup\$ Apr 4, 2017 at 15:02
  • \$\begingroup\$ Folowing the example if one cop posts an answer wich uses ROT13 and a robber implements ROT13 the answer is cracked. \$\endgroup\$
    – marcosm
    Apr 4, 2017 at 15:05
  • \$\begingroup\$ You might want to read this, which specifically mentions certain types of encryption/decryption \$\endgroup\$ Apr 4, 2017 at 15:18
  • \$\begingroup\$ Certanly I'm not an cryptography expert, wouldn't the constrait of being the same function that crypts-decrypts avoid such cases of random crypt? How can I change robber thread to avoud brute force? \$\endgroup\$
    – marcosm
    Apr 4, 2017 at 15:25
  • \$\begingroup\$ The problem with this is that real encryption is really hard to crack. All they need to do is add a random salt, and the robbers have to blindly guess what the salt is. \$\endgroup\$ Apr 4, 2017 at 17:27
  • \$\begingroup\$ I'm not sure what the proposed constraint is. An encryption function takes two arguments (plaintext and key) and produces one output (ciphertext). Are you saying that for any plaintext and key, encrypt(encrypt(plaintext, key), key) == plaintext? If so, I think that's essentially a restriction to stream ciphers, and you might as well ditch the whole plaintext processing and ask for a function which takes the key and the length of the plaintext and generates a deterministic output of that length. \$\endgroup\$ Apr 5, 2017 at 11:22
  • 1
    \$\begingroup\$ And it has the same cryptographic flaw that many cops-and-robbers do. It's not even really necessary to use good crypto: something like for(i='secret';n--;putch(i[0]))i=md5(i); would require heavy-duty cracking even if you hinted that that's the structure. \$\endgroup\$ Apr 5, 2017 at 11:25
  • \$\begingroup\$ ok, i've learned something, thanks for your comments. \$\endgroup\$
    – marcosm
    Apr 5, 2017 at 13:24
-2
\$\begingroup\$

Shortest “Hello World” for common journaled file systems.

Create a valid file system image as small as possible containing a file or a folder labeled “Hello World” with the following constraint:

  • If the hello world is a regular file, it needs to not be empty.
  • The file system needs to one of the following: ntfs3.1 ext3/ext4 zfs btrfs hfsplus

Please note you won’t be able to create the smallest file system with normal fomatting tool.
I mean they don’t allows to create the smallest theoriticall size.

Winner

The answer with the smallest file system

\$\endgroup\$
6
  • 1
    \$\begingroup\$ Hmm, why not xfs/zfs? Also, I don't really think this is a programming problem \$\endgroup\$
    – ASCII-only
    Apr 4, 2017 at 23:04
  • \$\begingroup\$ @ASCII-only the challenge seems to easy with xfs. Otherwise I didn’t got an answer to this question chat.stackexchange.com/transcript/message/36478963#36478963 . Though if it can be made on topic for a code challenge, please explain how. Although it is not a code problem, the special case of journaled filesystem require create a program behind the hood due to the huge number of data structure, so I think it’s still a programming problem, even it’s for being able to only write a unique file. \$\endgroup\$ Apr 4, 2017 at 23:10
  • \$\begingroup\$ You can make it a code problem by changing it to verifying that a byte sequence is a valid ext3 image. \$\endgroup\$ Apr 5, 2017 at 10:15
  • \$\begingroup\$ @PeterTaylor hemmm, by turning it in a code challenge, I still want something that can lead to create very small journaled filesystems. But does programming cahllenges needs also to be code challenges in order to be on topic? \$\endgroup\$ Apr 5, 2017 at 12:32
  • \$\begingroup\$ How are you drawing a distinction between programming challenges and code challenges? To me they're the same thing. \$\endgroup\$ Apr 5, 2017 at 15:54
  • \$\begingroup\$ @PeterTaylor I mean by handling or creating algorithms you don’t necessarily write code. But anyway this challenge need to be converted into a code challenge while still generating small filesystems. Any ideas? \$\endgroup\$ Apr 5, 2017 at 20:39
-2
\$\begingroup\$

Real Programmers Don't Comment Their Code

(Disclaimer: I do think programmers should comment their code.)
Your task is to write code in one language that removes comments from code in another language. Both single-line and multi-line comments should be removed from your program. You may write code in one language to remove comments from the same language. Input and output may be in any format. Finally, before answering, read the rules, please.


Rules

  1. Your program in language X must take a program in language Y as input and output the code with all comments removed. Language X may be the same as Language Y.
  2. You may not use language Y if:
    • Language Y has no comments whatsoever.
    • Language Y does not have 2 or more types of comment.
  3. Language Y should preferably have unusual comment behavior. (Ex.: older programming languages or Haskell)
  4. You may not ignore line continuations (usually \ at the end of the line).
  5. Your code may not remove anything inside a string literal.
  6. Standard loopholes are disallowed.
  7. I strongly encourage you, ironically, to provide an explanation if it is unclear how your code works.

This is , so may the best programmer with the shortest code win...

\$\endgroup\$
10
  • \$\begingroup\$ All answers from here apply to this challenge. I'd say this would be a duplicate. \$\endgroup\$
    – user42649
    Apr 9, 2017 at 21:23
  • \$\begingroup\$ If this isn't a duplicate, it's mostly about selecting a language Y which makes the question as easy as possible. (There are comment markers that are terser to parse than //…\n and /*…*/, so good answers won't be exactly the same, but they'll still be pretty similar.) \$\endgroup\$
    – user62131
    Apr 9, 2017 at 22:05
  • \$\begingroup\$ @ais523 How can I add variation and distinguish my challenge? \$\endgroup\$
    – ckjbgames
    Apr 9, 2017 at 23:14
  • \$\begingroup\$ Try requiring a specific Y whose comment behaviour is unusual. A good start would be to pick a language where comments nest, for example, although that might not be enough by itself. \$\endgroup\$
    – user62131
    Apr 9, 2017 at 23:17
  • \$\begingroup\$ But Pascal as given in the example only have 1 comment type (start with (* or {, and end with *) or }, not in string, and not (*)) \$\endgroup\$
    – tsh
    Apr 10, 2017 at 1:54
  • \$\begingroup\$ I should make the requirements less strict. \$\endgroup\$
    – ckjbgames
    Apr 10, 2017 at 12:58
  • \$\begingroup\$ Done! Requirements less strict. \$\endgroup\$
    – ckjbgames
    Apr 10, 2017 at 12:59
  • \$\begingroup\$ "3. Language Y should preferably have unusual comment behavior" very subjective thing, isn't it? \$\endgroup\$
    – 0xffcourse
    Apr 10, 2017 at 13:36
  • \$\begingroup\$ @officialaimm How to make it less subjective? \$\endgroup\$
    – ckjbgames
    Apr 10, 2017 at 14:44
  • \$\begingroup\$ This sandbox post has had little activity in a while and little positive reception from the community. Please improve / edit it or delete it to help us clean up the sandbox. \$\endgroup\$
    – user58826
    Jun 9, 2017 at 14:12
-2
\$\begingroup\$

You've been Thunderstruck!

Background

A "fun" drinking game is based on the classical hard rock song by AC/CD: Thunderstruck. The Thunderstruck drinking game starts when the song starts. When the word "thunder" is heard, the first person starts drinking, not stopping until the word "thunder" is said again. At that point, the next person begins to drink. This continues around the circle until the song ends.

The "twist" is that in the middle of the song, there is an entire verse where thunder is not uttered once. The person who gets this part -- and thus has to drink for the longest period of time -- is said to have been thunderstruck.

Challenge

Input: An Integer number of players.

Output: Which player got thunderstruck

Example

Input:  1
Output: 1

Input:  2
Output: 1

Input:  3
Output: 3

Rules

Here are the rules:

  • Assume that the number of players always is a positive integer.
  • Output should always give a positive integer.
  • You are not allowed to hardcode the number of times before the "solo" / long verse. Meaning your code has to find the longest part without the word thunderstruck, on its own.
  • Use the following lyrics for thunderstruck
  • Shortest code wins.
\$\endgroup\$
5
  • 3
    \$\begingroup\$ Forbidding hardcoding is not considered an observable requirement. \$\endgroup\$
    – Wheat Wizard Mod
    Apr 16, 2017 at 17:47
  • \$\begingroup\$ You should also state exactly which verse is the one without the thunder (it seems like it is the one after the 16th thunder) \$\endgroup\$
    – Wheat Wizard Mod
    Apr 16, 2017 at 17:48
  • \$\begingroup\$ And I think your 3rd test case is wrong here is a solution I made in python you can compare it to. \$\endgroup\$
    – Wheat Wizard Mod
    Apr 16, 2017 at 17:54
  • 3
    \$\begingroup\$ I think this challenge could be made more fun if you also take a song as input and have to find the longest part without a thunder. This would solve your hardcoding problem and make the challenge a little more fun. \$\endgroup\$
    – Wheat Wizard Mod
    Apr 16, 2017 at 17:56
  • 2
    \$\begingroup\$ Just seconding this; this challenge badly needs to take the song as input. If it doesn't, then the problem is that (even banning hardcoding) it becomes mostly about kolmogorov-complexity of the song (with the actual finding of the long gap becoming almost irrelevant by comparison), which is both a chameleon challenge and a duplicate; and because it's about kolmogorov complexity, thus compression, it'd be quite easy to choose a compressed representation in which the challenge was easier than you think. (Note that even taking input, the challenge is very easy anyway.) \$\endgroup\$
    – user62131
    Apr 17, 2017 at 9:34
-2
\$\begingroup\$

Description

Find the number of '1's in a binary number of any length. (Variable name up to you)

Output

You should output or print an integer/number/string which reflects the number of '1's that were counted.

Example

10101100 should return 4

Sandbox

I'm new here, so I don't know if this has been asked before. I searched but I could only find one other similar question, however that required the answer to be in binary, and was somewhat different in terms of the inputs.

My question seems very short and lacking details, but I don't know how to expand further on such a simple challenge.

Any other ways I could improve on my first post in this Stack Exchange?

\$\endgroup\$
6
  • \$\begingroup\$ codegolf.stackexchange.com/q/47870/194 \$\endgroup\$ Apr 27, 2017 at 10:19
  • \$\begingroup\$ @PeterTaylor but that involves decimal input. This question is for binary input. \$\endgroup\$ Apr 27, 2017 at 11:09
  • \$\begingroup\$ I'm not sure what you mean. Are you saying that the input will be a string, and the answer has to count the number of times the character '1' appears in it? \$\endgroup\$ Apr 27, 2017 at 11:20
  • \$\begingroup\$ Easy solution: add up all the numbers in the input. Many answers will have one-character answers. \$\endgroup\$
    – sporkl
    Apr 27, 2017 at 13:48
  • \$\begingroup\$ O - 05AB1E and 2SABLE polygot 1 byte. \$\endgroup\$ Apr 28, 2017 at 15:38
  • \$\begingroup\$ @MagicOctopusUrn c'mon 05AB1E and 2sable are practically the same thing I wouldn't call that polyglot :I \$\endgroup\$
    – hyper-neutrino Mod
    Sep 10, 2017 at 1:45
-2
\$\begingroup\$

Add numbers without math functions.

In this challenge, you must take an input that can take at least 10 numbers separated by commas and add them together without addition, subtraction, multiplication, and division symbols. Least bytes win. Normal code golf rules apply.

Examples:

Input:

1,2,3,4,5,6,7,8,9,10

Output:

55

Input:

1,1

Output:

2
\$\endgroup\$
5
  • \$\begingroup\$ You have to define what a math function is. Are we allowed bitwise operations? \$\endgroup\$
    – Beta Decay
    May 14, 2017 at 22:54
  • \$\begingroup\$ @BetaDecay Fixed it. \$\endgroup\$
    – arodebaugh
    May 15, 2017 at 0:50
  • \$\begingroup\$ I'm assuming summation counts as addition because that's just common sense. Does string or list repetition count as multiplication? \$\endgroup\$
    – user42649
    May 15, 2017 at 3:43
  • 2
    \$\begingroup\$ "Do X without math" has no chance of not being closed, just so you know. \$\endgroup\$
    – feersum
    May 15, 2017 at 4:04
  • \$\begingroup\$ Probable dup \$\endgroup\$ May 16, 2017 at 23:20
-2
\$\begingroup\$

Prove the Undecideability of the Halting Problem

More information on the halting problem.

Either:

Create a program that, when given an input, no single program (which receives your source and your input) can determine if your program terminates, or

Create a function that, when given an input, no single program (which receives your source and your input) can determine if your function returns.

Your score is the byte count of your program plus the byte count of your input (or of the shortest input in the set of input that solves this problem).

Lowest score wins.

//I would love some input on my wording.

\$\endgroup\$
12
  • \$\begingroup\$ Can I make a request to an external URL until I get a 404? \$\endgroup\$
    – user58826
    May 17, 2017 at 18:21
  • \$\begingroup\$ @programmer5000 can an external program determine whether your program will halt? For example, by pinging that URL themselves? \$\endgroup\$
    – Stephen
    May 17, 2017 at 18:24
  • \$\begingroup\$ Oh. Could I make a program that stops when it finds 5 points that prove the Happy Ending Problem wrong? \$\endgroup\$
    – user58826
    May 17, 2017 at 18:29
  • \$\begingroup\$ @programmer5000 if your program stops with a given input, and another program can predict that it will stop with that input, your program does not match specs. No input is accepted input, but it is very unlikely that an undecidable program can come from no input AFAIK. \$\endgroup\$
    – Stephen
    May 17, 2017 at 18:32
  • \$\begingroup\$ @programmer5000 from the Wikipedia page it seems like that problem is already solved, so that program will terminate, so another program could predict that. Could be wrong though. \$\endgroup\$
    – Stephen
    May 17, 2017 at 18:33
  • \$\begingroup\$ Um. eval. It's one byte long in GolfScript. \$\endgroup\$ May 17, 2017 at 21:35
  • \$\begingroup\$ @PeterTaylor you need to provide an input that is undecidable, and that counts towards your score. \$\endgroup\$
    – Stephen
    May 17, 2017 at 21:38
  • 3
    \$\begingroup\$ I don't think this is how the halting problem works... \$\endgroup\$ May 17, 2017 at 23:50
  • \$\begingroup\$ @DestructibleLemon You may be right; Wikipedia says a general algorithm to solve the halting problem for all possible program-input pairs cannot exist. Do I need to require two inputs? This answer seems to contradict Wikipedia though. \$\endgroup\$
    – Stephen
    May 18, 2017 at 0:10
  • \$\begingroup\$ hmmm, you definitely could do this (make it an interpreter) but I'm not sure how much you have to do to make this work... as in what the simplest program would be \$\endgroup\$ May 18, 2017 at 0:17
  • 1
    \$\begingroup\$ @StephenS It doesn't require 2 inputs, it requires a pair (program, input). \$\endgroup\$ May 18, 2017 at 1:07
  • 2
    \$\begingroup\$ It's the problem which is undecidable, not the instances. If you want to ask for a program which cannot be proven to halt or not halt, you have to specify the axiom system which can be used for the proof. See e.g. codegolf.stackexchange.com/q/79470/194 , codegolf.stackexchange.com/q/79620/194 \$\endgroup\$ May 18, 2017 at 6:19
-2
\$\begingroup\$

Google Logo in Conway's Game of Life

Conway's Game of Life base challenges are always fun so here is a new one.

This is Google's Logo (if you have not somehow seen it): Google Logo

The font is called Product Sans. Your job is to replicate this logo (no color of course) in 800x439px just like the image (just the letters).

Have fun! This is a popularity contest so the most votes wins. :D Good luck. Of course, this may not be possible but, you never know until you try.

Usual rules apply.

Inspired by this.

\$\endgroup\$
8
  • 6
    \$\begingroup\$ "looks like" isn't a tight enough specification for a challenge. \$\endgroup\$
    – user45941
    May 29, 2017 at 21:20
  • 1
    \$\begingroup\$ Also consider some method besides first-past-the-post, that winning criteria doesn't really work well with this site. \$\endgroup\$ May 30, 2017 at 0:22
  • 2
    \$\begingroup\$ So the answer could replicate it at the 0th generation? \$\endgroup\$ May 30, 2017 at 10:48
  • \$\begingroup\$ @PeterTaylor Good point \$\endgroup\$
    – arodebaugh
    May 30, 2017 at 13:14
  • \$\begingroup\$ @FryAmTheEggman Popularity contest? \$\endgroup\$
    – arodebaugh
    May 30, 2017 at 13:14
  • \$\begingroup\$ @Mego Also good point \$\endgroup\$
    – arodebaugh
    May 30, 2017 at 13:15
  • \$\begingroup\$ OK I updated stuff maybe it will make this challenge better \$\endgroup\$
    – arodebaugh
    May 30, 2017 at 13:16
  • 3
    \$\begingroup\$ 1. I don't see how the change you've made addresses my previous point. 2. Pop-con is barely any better than fastest-gun-in-the-west. 3. It's possible to test whether this is possible or not (I highly doubt it) by running the CA backwards. \$\endgroup\$ May 30, 2017 at 16:09
-2
\$\begingroup\$

The 2017 Loader contest

Here's a thing: Let's do the bignum bakeoff again.

Because why not.

What to do

Write a program in less than 256 characters that outputs the biggest number you can.
Yep, that's it. Biggest return value wins.

We'll run the program on a VM with infinite memory. (How do we do this?)

Rules

  • 256 chars max, excluding whitespace
  • Different leagues for each language
  • Output however you want
    • No explicitly printing numbers until your loop runs out. Print the number you generate directly. {1}
  • Program must terminate
  • No implementation-dependent shenanigans.
  • Implementation-independent shenanigans is encouraged.
  • ints are infinite.
  • Program must return the same number every time
  • Submission must include the approximate return value in any suitable googological notation.
  • Whitespace is space, tab, newline, formfeed, and return
    • BrainF***: Whitespace is all non-[]+-<> characters

{1} Allowed ways to return: printf("%d", num); return num;, etc.
Banned ways to return: for(;num>0;num--)printf("99999");, etc.


This is not a dupe of...

This because you can put any characters you want, not just non-digits; because we're hard-limiting the characters.


Suggested rules

  • No floats: float double long double, etc
  • No strings or chars
  • No bitfeilds
  • No looking at Command-line args

Next year's contest will be named after this year's winner, for no particular reason.

http://djm.cc/bignum-rules-posted.txt


Sandbox

  • How do you even test these programs?
  • What other rules should we have?
\$\endgroup\$
11
  • \$\begingroup\$ You don't actually explain the rules of the challenge, we would have to go to that link to find out what we are supposed to do. Aside from that, I think this has a lot of problems with your typing restrictions if these are not limited to C, but limiting it to C wouldn't really fit the spirit of the site. I think you may want to rethink how you want to approach this question. \$\endgroup\$ May 29, 2017 at 16:43
  • \$\begingroup\$ @FryAmTheEggman "Typing restrictions"? (Added proper instructions) \$\endgroup\$ May 29, 2017 at 16:45
  • 1
    \$\begingroup\$ Your post doesn't describe how people win. Is it by the largest possible number? Anyway, the problems are things like not counting whitespace, which can easily result in degenerate answers, as well as things like I/O streams and whatnot. All of your extra rules seem entirely based around C with no regard for other languages, which will not go well. \$\endgroup\$ May 29, 2017 at 16:48
  • 7
    \$\begingroup\$ In answer to "Because why not": because it will be closed as a dupe. \$\endgroup\$ May 29, 2017 at 17:59
  • \$\begingroup\$ Here's a couple of rules I would consider. 1. Program must generate the same result every time (e.g. not based on timer, probability, or the like). 2. Submissions should include, if not the exact resulting number, at least a best estimate, in scientific notation if need be. \$\endgroup\$ May 30, 2017 at 18:32
  • \$\begingroup\$ Scientific notation? People will post answers that far, far exceed that. In fact, Mathematica, 22: Fold[Power,2~Range~9999] It's 2^3^4^...^9999. That's not being represented anytime soon. \$\endgroup\$ May 31, 2017 at 3:31
  • 1
    \$\begingroup\$ This is a duplicate, and is also going to come down a lot to whether or not you allow programs that exceed the computational capacity of any existing computer. (If you require programs to work on a physical computer, the best they can possibly do is to use the entirety of memory as a counter and print out 9s over and over again. If you don't, the answers can easily be large enough that you need to use notation invented specifically for describing the number, because all other notations are not enough.) \$\endgroup\$
    – user62131
    May 31, 2017 at 22:40
  • \$\begingroup\$ If your code can simulate a Turing machine, it becomes hard to judge who the winner is, and whether an answer is valid at all. \$\endgroup\$
    – anatolyg
    Jun 1, 2017 at 20:35
  • 1
    \$\begingroup\$ Re your latest edit: you're wrong. The question it's a dupe of also has a hard limit to the number of characters; in fact it's a harder one, but the best answers could be copied with slight tweaking to take advantage of the extra space. And the digit restriction turned out not to be a serious problem: the winning answer would gain extremely little from being able to use digits. \$\endgroup\$ Jun 2, 2017 at 9:07
  • \$\begingroup\$ #PHP 8.3 256char echo exp(bindec("11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111")); \$\endgroup\$
    – Willtech
    Dec 28, 2023 at 5:13
  • \$\begingroup\$ @PeterTaylor That question is closed but I would like credit for my answer. \$\endgroup\$
    – Willtech
    Dec 28, 2023 at 5:18
-2
\$\begingroup\$

Draw an XBox

Here's an X:

\  /
 \/
 /\
/  \

And here's a Box:

+----+
|    |
|    |
|    |
|    |
+----+

So, for an XBox, just draw an X in a Box:

+----+
|\  /|
| \/ |
| /\ |
|/  \|
+----+

Your input will be a number (in any standard way) that will represent the size of the box. To output the above box, this could be the number of -/|\s (4), or the number of lines/columns (6), or even the intercept of the second diagonal (5) would be acceptable. (Don't ask me to accept the base256 encoding of the output though, as that's one of the many banned standard loopholes.)

Your program or function should then output (in any standard way) the XBox of the given size. If the \/s cross in the same character, place an X (as per Draw a big slash X). For example, here's an XBox three sizes larger than the one above:

+-------+
|\     /|
| \   / |
|  \ /  |
|   X   |
|  / \  |
| /   \ |
|/     \|
+-------+

This is , so the shortest program wins!

\$\endgroup\$
12
  • \$\begingroup\$ in some obvious way unclear/subjective \$\endgroup\$
    – MD XF
    Jun 9, 2017 at 16:35
  • \$\begingroup\$ @MDXF 4 examples weren't sufficient? \$\endgroup\$
    – Neil
    Jun 9, 2017 at 17:04
  • \$\begingroup\$ I'm just warning you that it could get closed for being too broad due to that statement. \$\endgroup\$
    – MD XF
    Jun 9, 2017 at 17:05
  • \$\begingroup\$ I agree with @MDXF \$\endgroup\$
    – Beta Decay
    Jun 9, 2017 at 18:03
  • \$\begingroup\$ @BetaDecay That's all very well, but I'm unclear as to what you want. \$\endgroup\$
    – Neil
    Jun 9, 2017 at 19:15
  • \$\begingroup\$ Just a basic explanation of how scaling works. Some examples would suffice \$\endgroup\$
    – Beta Decay
    Jun 9, 2017 at 21:32
  • \$\begingroup\$ I've added an example. \$\endgroup\$
    – Neil
    Jun 10, 2017 at 0:42
  • \$\begingroup\$ @MDXF Here's my problem. I just tried implementing this in Charcoal, and came up with Try it online!. As it turns out, to produce those example XBoxes I actually need sizes of 7 and 10, but I didn't want to penalise that choice of input just because I hadn't predicted that particular scaling. \$\endgroup\$
    – Neil
    Jun 10, 2017 at 13:42
  • \$\begingroup\$ @BetaDecay If you still have any further input it would be appreciated. \$\endgroup\$
    – Neil
    Jun 12, 2017 at 12:06
  • \$\begingroup\$ Related \$\endgroup\$ Jun 15, 2017 at 11:57
  • \$\begingroup\$ @KevinCruijssen Ugh, I even have an answer on that question... I guess the use of specific characters doesn't really sufficiently distinguish this one. \$\endgroup\$
    – Neil
    Jun 15, 2017 at 12:42
  • \$\begingroup\$ @Neil Well, using /+x\ instead of just * does make it a bit trickier, but it's indeed a bit too similar imho. \$\endgroup\$ Jun 15, 2017 at 13:11
-2
\$\begingroup\$

Print a Variable's Memory Address

Similar to this puzzle I posted earlier, with a difference that should make this challenge easier.

Create a function (not a full program) that prints or returns the memory address of the parameter passed in. Literal values should return a falsey value.

Examples:

var foo = 4901
var bar = "foobarbaz"
var baz = true

getMemoryAddress(from: foo) // 0x00000000004030f0
getMemoryAddress(from: bar) // 0x00000000004030f8
getMemoryAddress(from: baz) // 0x0000000000403110
getMemoryAddress(from: "Bad Value") // false

Note that you probably won't get the same exact result as show above.

\$\endgroup\$
2
  • \$\begingroup\$ Example(s) please. \$\endgroup\$
    – Shaggy
    Jun 15, 2017 at 15:15
  • \$\begingroup\$ @Shaggy Updated. \$\endgroup\$ Jun 15, 2017 at 15:38
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