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For challenges about dominoes, the game pieces.
10
votes
Which dominoes are missing?
CJam, 11 bytes
{:$7Ym*:$^}
An unnamed block (function) with I/O as a list of pairs of integers.
Test it here.
Explanation
:$ e# Sort each pair in the input.
7Ym* e# Get all pairs with elements …
13
votes
Topple some dominoes!
Each replacement computes one step the falling dominoes. … The purpose of this is to skip over | with fallen dominoes on both sides, because this is shorter than ruling out those cases with separate lookarounds in the other two cases.
...(/)\|...
$2$2
This …
13
votes
Accepted
Watch 'em fall like dominoes
Each iteration will simulate one step of the dominoes falling and then "sleep" a bit. This first stage replaces / and \ next to a space into __. …