188 lines
4.2 KiB
BQN
Executable file
188 lines
4.2 KiB
BQN
Executable file
#!/usr/bin/env BQN
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#
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# Utilities
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#
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IsAsciiNum ← ('0'⊸≤∧≤⟜'9')
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ReadInt ← {(𝕨⊸×+⊣)´∘⌽-⟜'0'𝕩} # stolen from leah2
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ReadDec ← 10⊸ReadInt
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ReadInput ← {•file.Lines ∾ •path‿"/input/day"‿(•Fmt 𝕩)}
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SplitOn ← ((⊢ (-1˙)⍟⊣¨ +`)∘=⊔⊢)
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_fix ← {𝕩 𝕊∘⊢⍟≢ 𝔽 𝕩}
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#
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# 2021-12-01
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#
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# part 1
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day1ExampleData ← 199‿200‿208‿210‿200‿207‿240‿269‿260‿263
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day1Input ← ReadDec¨ReadInput 1
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# NB: Because distance from the ground is never smaller than zero, it's
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# no problem that nudge inserts a zero at the end of the right list
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PositiveDeltaCount ← +´∘(⊢<«)+˝˘∘↕
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! 7 = 1 PositiveDeltaCount day1ExampleData
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•Out "Day 1.1: "∾•Fmt 1 PositiveDeltaCount day1Input
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# part 2
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! 5 = 3 PositiveDeltaCount day1ExampleData
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•Out "Day 1.2: "∾•Fmt 3 PositiveDeltaCount day1Input
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#
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# 2021-12-02
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#
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# part 1
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day2ExampleData ← ⟨
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"forward 5",
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"down 5",
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"forward 8",
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"up 3",
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"down 8",
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"forward 2",
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⟩
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day2Input ← ReadInput 2
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ParseSubmarineCommand ← (((↕2)⊸((((-1)⊸⋆)∘(2⊸|))×(=⟜(⌊∘(÷⟜2))))∘("duf"⊸⊐)∘⊑)×ReadDec∘(IsAsciiNum/⊢))
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SubmarineDestProduct ← {×´+´ParseSubmarineCommand¨𝕩}
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! 150 = SubmarineDestProduct day2ExampleData
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•Out "Day 2.1: "∾•Fmt SubmarineDestProduct day2Input
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# part 2
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SubmarineAimedDestProduct ← {
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×´+´((×´)∘(1⊸↓)≍(1⊸⊑))¨ (<0‿0‿0) (⊢∾((⊑∘⌽⊣)+(⊑⊢)))` ParseSubmarineCommand¨𝕩
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}
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! 900 = SubmarineAimedDestProduct day2ExampleData
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•Out "Day 2.2: "∾•Fmt SubmarineAimedDestProduct day2Input
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#
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# 2021-12-03
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#
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BinTable ← '0'-˜>
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day3ExampleData ← BinTable ⟨
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"00100",
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"11110",
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"10110",
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"10111",
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"10101",
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"01111",
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"00111",
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"11100",
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"10000",
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"11001",
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"00010",
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"01010",
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⟩
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day3Input ← BinTable ReadInput 3
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DeBinList ← ((2⊸×)+⊣)´⌽
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_tableAggr ← {((÷⟜2)∘(/⟜⥊)´∘⌽∘≢𝔽(+˝))𝕩}
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GammaRate ← < _tableAggr
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! 22 = DeBinList GammaRate day3ExampleData
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! 9 = DeBinList ¬GammaRate day3ExampleData
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•Out "Day 3.1: "∾•Fmt (¬×○DeBinList⊢) GammaRate day3Input
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_lifeSupportRating ← {
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# Need to rename the arguments, otherwise the ternary expr becomes a function
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bitPos ← 𝕨
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Cmp ← 𝔽
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crit ← Cmp _tableAggr 𝕩
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matchPos ← bitPos ⊑˘ crit ((⥊˜⟜≢)=⊢) 𝕩
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match ← matchPos/𝕩
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{1=≠match?⊏match;(bitPos+1) Cmp _lifeSupportRating match}
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}
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OxygenGeneratorRating ← DeBinList 0 ≤_lifeSupportRating ⊢
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CO2ScrubberRating ← DebinList 0 >_lifeSupportRating ⊢
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! 23 = OxygenGeneratorRating day3ExampleData
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! 10 = CO2ScrubberRating day3ExampleData
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•Out "Day 3.2: "∾•Fmt (OxygenGeneratorRating×CO2ScrubberRating) day3Input
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#
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# 2021-12-07
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#
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# part 1
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day6ExampleData ← ⟨16,1,2,0,4,2,7,1,2,14⟩
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day6Input ← ReadDec¨ ',' SplitOn ⊑ReadInput 6
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PossiblePositions ← (⌊´+⟜(↕1⊸+)⌈´)
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FuelConsumption ← +˝∘|∘(-⌜)
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_lowestFuelPossible ← {⌊´∘(𝔽⟜PossiblePositions)˜ 𝕩}
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! 37 = FuelConsumption _lowestFuelPossible day6ExampleData
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•Out "Day 7.1: "∾•Fmt FuelConsumption _lowestFuelPossible day6Input
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# part 2
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TriNum ← 1⊸+×÷⟜2
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FuelConsumption2 ← +˝∘(TriNum¨)∘|∘(-⌜)
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! 168 = FuelConsumption2 _lowestFuelPossible day6ExampleData
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•Out "Day 7.2: "∾•Fmt FuelConsumption2 _lowestFuelPossible day6Input
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#
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# 2021-12-09
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#
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# part 1
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ParseHeightMap ← ((≠≍(≠⊑))⥊∾)∘-⟜'0'
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day9ExampleData ← ParseHeightMap ⟨
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"2199943210",
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"3987894921",
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"9856789892",
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"8767896789",
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"9899965678"
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⟩
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day9Input ← ParseHeightMap ReadInput 9
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Rotate ← (⍉⌽)∘⊢⍟⊣ # counter clockwise
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LowPoints ← {∧´𝕩⊸(⊣<((-⊢) Rotate ∞⊸»˘∘Rotate˜))¨ ↕4}
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RiskLevelSum ← (+´⥊)∘(1⊸+×LowPoints)
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! 15 = RiskLevelSum day9ExampleData
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•Out "Day 9.1: "∾•Fmt RiskLevelSum day9Input
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# part 2
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NumberBasins ← ((1⊸+⊒⌾⥊)×⊢)∘LowPoints
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Basins ← {𝕩⊸((<⟜9⊣)∧(«⌈»⌈«˘⌈»˘⌈⊢)∘⊢) _fix NumberBasins 𝕩}
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LargestBasinsProduct ← {×´ 3↑ ∨ 1↓ ≠¨ ⊔⥊Basins 𝕩}
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! 1134 = LargestBasinsProduct day9ExampleData
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•Out "Day 9.2: "∾•Fmt LargestBasinsProduct day9Input
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