copy pasting the rules from last year’s thread:

Rules: no spoilers.

The other rules are made up aswe go along.

Share code by link to a forge, home page, pastebin (Eric Wastl has one here) or code section in a comment.

  • @gerikson
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    28 hours ago
    re: 4-2

    is it really n^2 tho? You have to do a constant check around each element, but that does not increase with the number of elements. And you can optimize a bit by marking already seen 'A’s as illegal states and don’t have to check them when the next row is processed.

    • @swlabr
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      28 hours ago
      i am a simple man

      I see square input, i say n2