Created
December 28, 2020 04:35
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AoC2020 Day 13 Dyalog APL solution from @jayfoad
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| ⍝ Credit: @jayfoad (https://github.com/jayfoad/aoc2020apl/blob/main/p13.dyalog) | |
| ⎕IO←0 | |
| a←⍎⊃p←⊃⎕NGET'p13.txt'1 | |
| d←⍎¨b⌷⍨⊂c←⍸(,'x')∘≢¨b←'\w+'⎕S'&'⊃⌽p | |
| {(⊃⍋⍵)⊃d×⍵}d|-a ⍝ part 1 | |
| ⎕PP←17 ⋄ ⎕FR←1287 | |
| gcd←{⍵=0:⍺ 1 0 ⋄ g s t←⍵∇⍵|⍺ ⋄ g t(s-t×⌊⍺÷⍵)} | |
| crt←{z←⍵÷⍨m←×/⍵ ⋄ m|+/⍺×z×1⊃¨z gcd¨⍵} | |
| (-c)crt d ⍝ part 2 |
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