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Top new questions this week:

Speed of Lobsters

From the subreddit r/SpeedOfLobsters: Edit the text of an image to create a new phrase This meme format/style is pretty self-explanatory. Simply have a browse through the subreddit if you need more ...

code-golf string  
asked by caird coinheringaahing 27 votes
answered by xash 19 votes

Print a conversion table for (un)signed bytes

Your task: Print or return a conversion table with every byte from 00 to ff's value as an unsigned integer, to its value as a ...

code-golf kolmogorov-complexity integer  
asked by Redwolf Programs 20 votes
answered by Digital Trauma 10 votes

Which answer did this user write?

This is an answer-chaining challenge where each answer must take an integer \$N\$ as input and return the 1-indexed ID of the answer which was written by the user whose ID is \$N\$. You may want to ...

restricted-source answer-chaining  
asked by Arnauld 15 votes
answered by Arnauld 6 votes

The Math is Right, But the Answer is Wrong - Cops

Robber Thread here The Challenge Choose any numeric* formula, algorithm, or code challenge. Implement it in such a way that the math is correct, but at least one answer is wildly** wrong due to some ...

asked by Beefster 13 votes
answered by Sisyphus 6 votes

The Math is Right, But the Answer is Wrong - Robbers

Challenge The cops created code challenges which result in certain wildly incorrect answers despite correct math. Choose an uncracked, not safe formula from the cop thread. Your task is to find an ...

asked by Beefster 8 votes
answered by water_ghosts 7 votes

Greatest hits from previous weeks:

Generate an understandable sentence

Problem: Generate a sentence that can be read and understood. It must contain a subject, verb, and object, and tenses and plurals must match. The program must also be able to generate several ...

asked by TheDoctor 57 votes
answered by Riot 88 votes

Print the last, middle and first character of your code

The challenge is simple: Print the last, middle, and first character of your program's source code, in that order. The middle character is defined as follows, assuming a source length of ...

code-golf quine  
asked by bigyihsuan 62 votes
answered by Oliver 182 votes

We're no strangers to code golf, you know the rules, and so do I

Write the shortest program that prints the entire lyrics of "Never Gonna Give You Up" by Rick Astley. Rules: Must output the lyrics exactly as they appear in the above pastebin*. Here's the raw dump:...

code-golf kolmogorov-complexity  
asked by Polynomial 266 votes
answered by Ed H. 83 votes

Survival Game - Create Your Wolf

The Board The Board is a two dimensional array of cells. Cells are populated by Animals. Every day, all Animals on the Board simultaneously make one move. If two or more Animals move to the same cell, ...

king-of-the-hill java  
asked by Rainbolt 239 votes
answered by Herjan 47 votes

Make a circle illusion animation

Your job is to animate this circle illusion. It looks like the points rotating inside of the circle, but they are actually just moving in straight lines. Criterias The result has to be animated. The ...

popularity-contest graphical-output animation  
asked by swish 88 votes
answered by trichoplax 131 votes

Is this even or odd?

Note: There is not been a vanilla parity test challenge yet (There is a C/C++ one but that disallows the ability to use languages other than C/C++, and other non-vanilla ones are mostly closed too), ...

code-golf arithmetic number-theory decision-problem  
asked by Matthew Roh 70 votes
answered by Luis Mendo 120 votes

Trick or Treat polyglot

Since Halloween is coming up I thought I might start a fun little code golf challenge! The challenge is quite simple. You have to write a program that outputs either ...

code-golf string polyglot  
asked by BrainStone 163 votes
answered by Dennis 151 votes
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