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xpqz/aoc20205.dyalog

Created December 5, 2020 09:42
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AoC 2020 Day05 Dyalog APL
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aoc20205.dyalog
DAY05←⊃⎕NGET'data/2020/day05.txt'1
SID←{0=≢⍵:⊃⍺⋄(lo hi)←⍺⋄half←hi÷2⋄(0⊃⍵)∊'FL':(lo,half)∇1↓⍵⋄((lo+half),half)∇1↓⍵}
⌈/s←0 1024∘SID¨DAY05
gap←⍸~2{⍵=⍺+1}/sorted←s[⍋s]
1+gap⊃sorted
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