Problem 4. Make a checkerboard matrix

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Solution 306061

Submitted on 18 Aug 2013

Size: 10
Leading solution size is 12.

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8 Comments

8 Comments

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liang xu on 26 Oct 2017

so stupid rule!!

Minyoung Hong on 30 Mar 2023

what is this?

Christian Schröder on 30 Mar 2023

@Minyoung Hong It's a trick to decrease the solution size. The actual code is in the (?@...) construct in the regular expression, and is evaluated using match-time code evaluation. See doc regexp for more information; but note that this trick is generally frowned upon on Cody.

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