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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\$ …
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 …
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 …
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 …
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 …