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For challenges that involve the physical layout or physical manipulation of source-code.

27 votes
17 answers
2k views

Quineoid Triple - A(B) = C

Write three different programs such that when any one program is provided as input to one of the other two, you get the source of the remaining program as output. More explicitly, given programs \$A\$ …
Beefster's user avatar
  • 9,971
6 votes
1 answer
364 views

Two Diehards Make a Glider

In Conway's Game of Life, there is an infinite square grid of cells, each of which is alive or dead. The pattern changes each "generation". A dead cell with exactly 3 live neighbors (orthogonal or dia …
Beefster's user avatar
  • 9,971
33 votes
17 answers
4k views

2 Cats in a Quine

Challenge Make two programs, A and B, which are both cat programs in the same language. When concatenated, AB (also in the same language) should be a quine. For example, suppose hello and world are bo …
Beefster's user avatar
  • 9,971
14 votes
2 answers
780 views

Error-detecting Self-repairing Program

Your task is to create a program where if any one character is deleted, it will detect which character was deleted and then re-insert the deleted character in its own source file. For instance, if yo …
Beefster's user avatar
  • 9,971
39 votes
29 answers
5k views

Cat, Quine, Hello World

Write a cat program, a quine, and a Hello World in the same language such that when two specific programs of the three are concatenated in a certain order, you get the third program. It does not matte …
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  • 9,971