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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    English
    45 days ago
    re: 10 commentary

    apparently “everyone” did this. Me too

    • @zogwarg
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      14 days ago
      re:10

      Mwahaha I’m just lazy and did are “unique” (single word dropped for part 2) of start/end pairs.

      #!/usr/bin/env jq -n -R -f
      
      ([
           inputs/ "" | map(tonumber? // -1) | to_entries
       ] | to_entries | map( # '.' = -1 for handling examples #
           .key as $y | .value[]
         | .key as $x | .value   | { "\([$x,$y])":[[$x,$y],.] }
      )|add) as $grid | #           Get indexed grid          #
      
      [
        ($grid[]|select(last==0)) | [.] |    #   Start from every '0' head
        recurse(                             #
          .[-1][1] as $l |                   # Get altitude of current trail
          (                                  #
            .[-1][0]                         #
            | ( .[0] = (.[0] + (1,-1)) ),    #
              ( .[1] = (.[1] + (1,-1)) )     #
          ) as $np |                         #   Get all possible +1 steps
          if $grid["\($np)"][1] != $l + 1 then
            empty                            #     Drop path if invalid
          else                               #
          . += [ $grid["\($np)"] ]           #     Build path if valid
          end                                #
        ) | select(last[1]==9)               #   Only keep complete trails
          | . |= [first,last]                #      Only Keep start/end
      ]
      
      # Get score = sum of unique start/end pairs.
      | group_by(first) | map(unique|length) | add