Highest scored questions
14,357 questions
1252
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Build a working game of Tetris in Conway's Game of Life
Here is a theoretical question - one that doesn't afford an easy answer in any case, not even the trivial one.
In Conway's Game of Life, there exist constructs such as the metapixel which allow the ...
- 35.3k
632
votes
344
answers
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Produce the number 2014 without any numbers in your source code
Note to challenge writers as per meta consensus:
This question was well-received when it was posted, but challenges
like this, asking answerers to Do X without using
Y
are likely to be poorly received....
- 35.3k
559
votes
1
answer
197k
views
Build a digital clock in Conway's Game of Life
Your task is to build a Game of Life simulation representing a digital clock, which satisfies the following properties:
The clock displays the hours and minutes in decimal (e.g. ...
- 35.3k
552
votes
243
answers
138k
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Showcase of Languages
Notes
This thread is open and unlocked only because the community decided to make an exception. Please do not use this question as evidence that you can ask similar questions here. Please do not ...
524
votes
1k
answers
200k
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"Hello, World!"
So... uh... this is a bit embarrassing. But we don't have a plain "Hello, World!" challenge yet (despite having 35 variants tagged with hello-world, and counting). While this is not the most ...
- 198k
464
votes
50
answers
178k
views
Images with all colors
Similar to the images on allrgb.com, make images where each pixel is a unique color (no color is used twice and no color is missing).
Give a program that generates such an image, along with a ...
- 7,206
437
votes
26
answers
151k
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Build a Compiler Bomb
Introduction
You're probably familiar with zip bombs, XML bombs, etc. Put simply, they are (relatively) small files which produce enormous output when interpreted by naïve software. The challenge ...
- 8,549
395
votes
50
answers
59k
views
Covfefify a string
In this challenge, you must take a string matching the regex ^[a-zA-Z]+$ or whatever is reasonable (you don't have to consider uppercase or lowercase letters if you ...
- 6,408
390
votes
156
answers
292k
views
Write a program that makes 2 + 2 = 5 [closed]
Write a program that seemingly adds the numbers 2 and 2 and outputs 5. This is an underhanded contest.
Your program cannot output any errors. Watch out for memory holes! Input is optional.
...
- 12.4k
389
votes
36
answers
72k
views
American Gothic in the palette of Mona Lisa: Rearrange the pixels
You are given two true color images, the Source and the Palette. They do not necessarily have the same dimensions but it is guaranteed that their areas are the same, i.e. they have the same number of ...
- 90.2k
381
votes
1
answer
120k
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Regex that only matches itself
There are some pretty cool challenges out there involving regex (Self-matching regex, Regex validating regex)
This may well be impossible, but is there a regex that will ONLY match itself?
NOTE, ...
- 3,823
379
votes
110
answers
91k
views
Most creative way to display 42
Douglas Adams was born on March 11, 1952, and died when he was just 49. In honor of this wonderful writer, I challenge you to display 42 in the most creative way possible.
You could print it in the ...
- 3,042
361
votes
7
answers
52k
views
Upgoat or Downgoat?
Given an image of a goat, your program should best try to identify whether the goat is upside down, or not.
Examples
These are examples of what the input may be. Not actual inputs
Input:
Output:
<...
- 29.1k
348
votes
43
answers
332k
views
High throughput Fizz Buzz
Fizz Buzz is a common challenge given during interviews. The challenge goes something like this:
Write a program that prints the numbers from 1 to n. If a number is
divisible by 3, write Fizz instead....
- 2,717
337
votes
182
answers
150k
views
Tips for golfing in Python
What general tips do you have for golfing in Python? I'm looking for ideas which can be applied to code-golf problems and which are also at least somewhat specific to Python (e.g. "remove comments" is ...
- 12.9k