~pmikkelsen/aoc2023

884d75940414586164973d846583b75791fe311d — Peter Mikkelsen 6 months ago ba95915
Solve day 14
2 files changed, 132 insertions(+), 0 deletions(-)

A Day14.aplf
A input/day14
A Day14.aplf => Day14.aplf +32 -0
@@ 0,0 1,32 @@
 (r1 r2)←Day14;fall;input;tilt;cycle;seen;i;final;n;load
 input←↑⊃⎕NGET'input/day14' 1
 fall←{
     x←⍵⍪'#'
     empty←'.'=x
     rocks←'O'=x
     movable←⍸rocks∧rocks=1⊖empty
     x[movable]←'.'
     x[(⊂1 0)+movable]←'O'
     ¯1↓x
 }⍣≡
 tilt←{
     ⍺=1:⊖fall⊖⍵   ⍝ north
     ⍺=2:⌽⍉fall⍉⌽⍵ ⍝ west
     ⍺=3:fall ⍵    ⍝ south
     ⍺=4:⍉⌽fall⌽⍉⍵ ⍝ east
 }
 cycle←{⊃tilt⌿(⊖⍳4),⊂⍵}
 load←{+⌿(⊖⍳≢⍵)×+/'O'=⍵}
 r1←load 1 tilt input

 seen←⍬
 :While 1
     :If (⊂input)∊seen
         n←¯1+seen⍳⊂input
         r2←load(1+(≢seen)|1000000000-n)⊃seen←n↓seen
         :Return
     :Else
         seen,←⊂input
     :EndIf
     input←cycle input
 :EndWhile

A input/day14 => input/day14 +100 -0
@@ 0,0 1,100 @@
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