diff options
Diffstat (limited to 'Day3.lean')
| -rw-r--r-- | Day3.lean | 22 |
1 files changed, 11 insertions, 11 deletions
@@ -13,22 +13,22 @@ def Coordinate.default : Coordinate := {x := 0, y := 0} /--Returns the adjacent fields, row-major order (this is important)-/ def Coordinate.adjacents : Coordinate → List Coordinate | { x := 0, y := 0} => [ - .mk 1 0, - .mk 1 1, .mk 0 1 + ⟨1,0⟩, + ⟨0,1⟩, ⟨1,1⟩ ] | { x := 0, y := y} => [ - .mk 0 y.pred, .mk 1 y.pred, - .mk 1 y, - .mk 0 y.succ, .mk 1 y.succ + ⟨0,y.pred⟩, ⟨1,y.pred⟩, + ⟨1,y⟩, + ⟨0,y.succ⟩, ⟨1,y.succ⟩ ] | { x := x, y := 0} => [ - .mk x.pred 0, .mk x.succ 0, - .mk x.pred 1, .mk x 1, .mk x.succ 1 + ⟨x.pred,0⟩, ⟨x.succ,0⟩, + ⟨x.pred,1⟩, ⟨x,1⟩, ⟨x.succ,1⟩ ] | { x := x, y := y} => [ - .mk x.pred y.pred, .mk x y.pred, .mk x.succ y.pred, - .mk x.pred y, .mk x.succ y, - .mk x.pred y.succ, .mk x y.succ, .mk x.succ y.succ + ⟨x.pred,y.pred⟩, ⟨x,y.pred⟩, ⟨x.succ,y.pred⟩, + ⟨x.pred,y⟩, ⟨x.succ,y⟩, + ⟨x.pred,y.succ⟩, ⟨x,y.succ⟩, ⟨x.succ,y.succ⟩ ] structure Part : Type 0 where @@ -109,7 +109,7 @@ def part2 (schematic : Schematic) : Nat := let numbersNextGearSymbols := List.dedup <$> gearSymbols.map λgs ↦ gs.position.adjacents.filterMap numberCoordinates.find? let gearSymbols := numbersNextGearSymbols.filter (List.length · == 2) - let gearRatios : List Nat := gearSymbols.map $ List.foldl (· * PartNumber.value ·) 1 + let gearRatios := gearSymbols.map $ List.foldl (· * PartNumber.value ·) 1 gearRatios.foldl (· + ·) 0 open DayPart |