Created
December 19, 2023 15:26
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| ⍝ DAY 1 | |
| in←⊃⎕nget'01.txt'1 | |
| digitsStr←'one' 'two' 'three' 'four' 'five' 'six' 'seven' 'eight' 'nine' | |
| mask←{(⍳9)+.×↑(⍷∘⍺)¨⍵} | |
| part1←+/{10⊥(⊃,¯1∘↑)(⍵ mask '123456789')~0}¨in | |
| part2←+/{10⊥(⊃,¯1∘↑)((⍵ mask '123456789')∨⍵ mask digitsStr)~0}¨in | |
| ⍝ DAY 2 | |
| in←⊃⎕nget'02.txt'1 | |
| extractMax←{↑⌈/{10⊥¯1+(11|('0123456789'⍳⍵))~0}¨⍺{(⌈/¨(⍺∘⍷)¨matches)/matches←((3⍴1)+.×';' ':' ','(∘.≠)⍵)⊆⍵}⍵} | |
| ⊢day2part1←+/(⍳≢in)+.×{(14≥'blue' extractMax ⍵) ∧ (13≥'green' extractMax ⍵) ∧ (12≥'red' extractMax ⍵)}¨in | |
| ⊢day2part2←+/{('blue' extractMax ⍵) × ('green' extractMax ⍵) × ('red' extractMax ⍵)}¨in | |
| ⍝ DAY 3 | |
| in←⊃⎕nget'03.txt'1 | |
| safeDigitsMask←↑,/(0,⊢)¨(∊∘⎕D)¨in ⍝ prepend rows with 0 before partitioning groups | |
| ⍝ assign unique ids (incremented integer) to number groups | |
| groups←↑(1∘↓)¨↓(0 1+⍴↑in)⍴safeDigitsMask×0,+\2</safeDigitsMask | |
| digitsMask←↑(1∘↓)¨↓(0 1+⍴↑in)⍴safeDigitsMask | |
| numbers←(,digitsMask)⊆,↑in | |
| groupsPerCell←{⊂↑numbers[∪0~⍨,⍵]}⌺3 3⊢groups ⍝ windowing with a 3x3 wrapping matrix | |
| ⊢part1←+/{+/⍎¨↓⍵}¨(~(,↑in)∊⎕D,'.')/,groupsPerCell | |
| ⊢part2←+/{×/⍎¨↓⍵}¨(((,↑in)∊'*')∧(2=≢¨,groupsPerCell))/,groupsPerCell | |
| ⍝ DAY 4 | |
| in←⊃⎕nget'04.txt'1 | |
| To←{⍺+¯1+⍳1+⍵-⍺} | |
| pairs←((⍎¨' ' (≠⊆⊢)⊢)¨⊢)¨('|'(≠⊆⊢)9↓⊢)¨in | |
| ⍝ gains ex: 4 2 2 1 0 0 - first card 4 gains, second 2, ... | |
| gains←⌊¨{winning deck←⍵ ⋄ ≢(deck∊winning)/deck}¨pairs | |
| ⊢part1←+/gains | |
| ⍝ m ex: | |
| ⍝ 0 1 1 1 1 0 | |
| ⍝ 0 0 1 1 0 0 | |
| ⍝ 0 0 0 1 1 0 | |
| ⍝ 0 0 0 0 1 0 | |
| ⍝ 0 0 0 0 0 0 | |
| ⍝ 0 0 0 0 0 0 | |
| m←↑{1(+@((⍵+1)To ⍵+gains[⍵]))(⍴gains)⍴0}¨⍳(⍴gains) | |
| i←(⍴gains)⍴1 ⍝ identity matrix | |
| ⍝ (i+m+.×⊢)⍣≡i expands to i + m + (m+.×m) + (m+.×m+.×m) + ... until it stabilizes | |
| ⊢part2←+/(i+m+.×⊢)⍣≡i | |
| ⍝ multiply matrix rows by a vector => | |
| 1 2 3 4 5 6 (×⍤0 1) ↑{1(+@((⍵+1)To ⍵+part2[⍵]))6⍴0}¨⍳6 | |
| ⍝ DAY 5 (unfinished) | |
| in←⊃⎕nget'05.txt'1 | |
| FindIndex←{(d s r)←⍵ ⋄ {¯1 (d+⍵-s)[1+(⍵>s)∧(⍵<s+r)]}} | |
| {(d s r)←⍵ ⋄ {¯1 (d+⍵-s)[1+(⍵>s)∧(⍵<s+r)]}}¨¨{⍎¨' '(≠⊆⊢)⍵}¨¨(2↓⊢)¨((''≡⊢)¨in)⊂in |
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