76 lines
2.4 KiB
BQN
76 lines
2.4 KiB
BQN
# a‿b Sub x: the b-length subarray starting at a
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Sub ⇐ {a‿b𝕊𝕩:b↑a↓𝕩}
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# e Split xs: split xs on occurrences of e (default 0)
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Split ⇐ {(⊏ ∾ 1⊸↓¨∘(1⊸↓)) Sub⟜𝕩¨ (» ⋈¨ ⊢-») /w=𝕩∾(w←𝕨⊣0)}
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# n Chunk xs: split into chunks of length n (the last one might be smaller)
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Chunk ⇐ {(⌊𝕨÷˜↕≠𝕩)⊔𝕩}
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Day1 ⇐ (⊑ ⋈ (+´3⊸↑))∘(∨+´¨)∘Split∘(•BQN⎊0¨)∘•FLines
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# ⟨ 72602 207410 ⟩
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Day2 ⇐ {
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B ← ⊣ (A ← {1+𝕩+3×3|1+𝕩-𝕨}) {3|𝕨+𝕩-1}
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+´ (A⋈B)´∘{"AX"-˜0‿2⊏𝕩}¨ •FLines 𝕩
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}
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# ⟨ 17189 13490 ⟩
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Day3 ⇐ {
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Prio ← ⊢ - ≤⟜'Z'◶"`&"
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A ← +´∘∾ {(Prio¨×∊⟜𝕩)𝕨}○⍷´∘(<˘ 2‿∘⊸⥊)¨
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B ← +´∘∾ {a‿b‿c:(Prio¨a)×b∧○(a⊸∊)c}¨∘(3⊸Chunk)∘(⍷¨)
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(A⋈B) •FLines 𝕩
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}
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# ⟨ 7683 2488 ⟩
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Day4 ⇐ {
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Line ← •BQN '‿'⍟(⊑∊⟜"-,")¨ # hehe
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F ← {∨´∧´˘≥´⎉1(3⥊2)⥊𝕩⊏˜𝕨-'a'}
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A ← "cabddbac"⊸F, B ← "cabcacda"⊸F
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+´ (A⋈B)∘Line¨ •FLines 𝕩
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}
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# ⟨ 536 845 ⟩
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Day5 ⇐ {
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inp ← •FLines 𝕩
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Start ← {(𝕨⊸=⊑⎊0)¨⊸/ 𝕩}
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stks ← ' '⊸≠⊸/¨ <˘⍉> (1⊸⊑¨ 4⊸Chunk)¨ '[' Start inp
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todo ← •BQN⚇1 (1‿3‿5⊸⊏ ' '⊸Split)¨ 'm' Start inp
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_Do1 ← {
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n‿s‿t ← 𝕩 - 0‿1‿1
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l‿r ← n (↑⋈↓) s⊑𝕨
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(𝔽 l)⊸∾⌾(t⊸⊑) r⌾(s⊸⊑) 𝕨
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}
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_Do ← {⊑¨ 𝕨𝔽_Do1˜´⌽𝕩}, A ← ⌽_Do, B ← ⊢_Do
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stks (A⋈B) todo
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}
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# ⟨ "QNNTGTPFN" "GGNPJBTTR" ⟩
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Day6 ⇐ {{𝕨+ ⊑/ ≡⟜⍷˘ 𝕨↕𝕩}⟜(•FChars 𝕩)¨ 4‿14}
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# ⟨ 1929 3298 ⟩
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Day8 ⇐ {
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_rots ← {F‿x←𝔽‿𝕩, >{F⌾𝕏x}¨⟨⊢,⍉,⌽˘,⍉⌽⟩}
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A ← {+´⥊ ∨˝ ∧´∘(⊑>1⊸↓)¨ 𝕩}
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B ← {⌈´⥊ ×˝ {1⊑⎊(1-˜≠𝕩) (/⊢≥⊑) 𝕩}¨ 𝕩}
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(A⋈B) (¯1↓↓)˘_rots '0'-˜ >•FLines 𝕩
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}
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# ⟨ 1843 180000 ⟩
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Day10 ⇐ {
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Line ← 0∾ ·•BQN⎊⟨⟩ 5↓⊢
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A ← (+´ 19⊸⊏∘⍉) (⊢×1+↕∘≠⌾⥊)
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B ← ⊏⟜" █" (1≥⟜|-)⟜(↕≠)˘
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(A⋈B) ∘‿40⥊ +` 1»∾Line¨ •FLines 𝕩
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}
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# ⟨ 13060 "FJUBULRZ" ⟩
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# (but the string is a big banner)
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Day18 ⇐ { # part 1 only :[
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grid ← (↕∘> 1+⌈˝)⊸∊ •BQN¨ '‿'⍟(=⟜',')⚇0 •FLines 𝕩
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touch ← +´⥊ «‿» {∧⟜(𝕎⎉𝕩) grid}⌜ 1+↕3
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+´⥊ (6×grid)-touch
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}
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# 3470
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•Show Day18 ⊑•args
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