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day12_part01.fs
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day12_part01.fs
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module day12_part01
open AdventOfCode_Utilities
open CustomDataTypes
open AdventOfCode_2020.Modules
let path = "day12/day12_input.txt"
let inputLines = LocalHelper.GetLinesFromFile(path)
let movements =
seq {
for line in inputLines do
let parts =
match line with
| Regex @"(?<direction>\w)(?<offset>\d+)" [d; o] ->
let mov =
match d with
| "N" -> MovementType.NORTH
| "S" -> MovementType.SOUTH
| "E" -> MovementType.EAST
| "W" -> MovementType.WEST
| "L" -> MovementType.LEFT
| "R" -> MovementType.RIGHT
| "F" -> MovementType.FORWARD
| _ -> failwith "Invalid Movement type"
Some { Mov= mov; Offset = o|> int}
| _ -> failwith "Invalid input line"
yield parts.Value
} |> List.ofSeq
let getNewPosition (currentStatus: MovementOperation[]) (currentPosition: MovementOperation) (movement: MovementOperation) =
let newCurrentStatus =
match movement.Mov with
| MovementType.NORTH -> (currentPosition, [| { Mov = MovementType.NORTH; Offset = currentStatus.[0].Offset + movement.Offset }; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| MovementType.SOUTH -> (currentPosition, [| currentStatus.[0]; { Mov = MovementType.SOUTH; Offset = currentStatus.[1].Offset + movement.Offset }; currentStatus.[2]; currentStatus.[3] |])
| MovementType.EAST -> (currentPosition, [| currentStatus.[0]; currentStatus.[1]; { Mov = MovementType.EAST; Offset = currentStatus.[2].Offset + movement.Offset }; currentStatus.[3] |])
| MovementType.WEST -> (currentPosition, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; { Mov = MovementType.WEST; Offset = currentStatus.[3].Offset + movement.Offset } |])
| MovementType.LEFT ->
match (movement.Offset, currentPosition) with
| (90, mov) when mov.Mov = MovementType.NORTH -> ({ Mov= MovementType.WEST; Offset= currentPosition.Offset } , [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (90, mov) when mov.Mov = MovementType.SOUTH -> ({ Mov= MovementType.EAST; Offset= currentPosition.Offset } , [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (90, mov) when mov.Mov = MovementType.EAST -> ({ Mov= MovementType.NORTH; Offset= currentPosition.Offset }, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (90, mov) when mov.Mov = MovementType.WEST -> ({ Mov= MovementType.SOUTH; Offset= currentPosition.Offset }, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (180, mov) when mov.Mov = MovementType.NORTH -> ({ Mov= MovementType.SOUTH; Offset= currentPosition.Offset }, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (180, mov) when mov.Mov = MovementType.SOUTH -> ({ Mov= MovementType.NORTH; Offset= currentPosition.Offset }, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (180, mov) when mov.Mov = MovementType.EAST -> ({ Mov= MovementType.WEST; Offset= currentPosition.Offset }, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (180, mov) when mov.Mov = MovementType.WEST -> ({ Mov= MovementType.EAST; Offset= currentPosition.Offset }, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (270, mov) when mov.Mov = MovementType.NORTH -> ({ Mov= MovementType.EAST; Offset= currentPosition.Offset }, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (270, mov) when mov.Mov = MovementType.SOUTH -> ({ Mov= MovementType.WEST; Offset= currentPosition.Offset }, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (270, mov) when mov.Mov = MovementType.EAST -> ({ Mov= MovementType.SOUTH; Offset= currentPosition.Offset }, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (270, mov) when mov.Mov = MovementType.WEST -> ({ Mov= MovementType.NORTH; Offset= currentPosition.Offset }, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| _ -> failwith "Invalid turn left"
| MovementType.RIGHT ->
match (movement.Offset, currentPosition) with
| (90, mov) when mov.Mov = MovementType.NORTH -> ({Mov= MovementType.EAST; Offset= currentPosition.Offset}, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (90, mov) when mov.Mov = MovementType.SOUTH -> ({Mov= MovementType.WEST; Offset= currentPosition.Offset}, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (90, mov) when mov.Mov = MovementType.EAST -> ({Mov= MovementType.SOUTH; Offset= currentPosition.Offset}, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (90, mov) when mov.Mov = MovementType.WEST -> ({Mov= MovementType.NORTH; Offset= currentPosition.Offset}, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (180, mov) when mov.Mov = MovementType.NORTH -> ({Mov= MovementType.SOUTH; Offset= currentPosition.Offset}, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (180, mov) when mov.Mov = MovementType.SOUTH -> ({Mov= MovementType.NORTH; Offset= currentPosition.Offset}, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (180, mov) when mov.Mov = MovementType.EAST -> ({Mov= MovementType.WEST; Offset= currentPosition.Offset}, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (180, mov) when mov.Mov = MovementType.WEST -> ({Mov= MovementType.EAST; Offset= currentPosition.Offset}, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (270, mov) when mov.Mov = MovementType.NORTH -> ({Mov= MovementType.WEST; Offset= currentPosition.Offset}, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (270, mov) when mov.Mov = MovementType.SOUTH -> ({Mov= MovementType.EAST; Offset= currentPosition.Offset}, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (270, mov) when mov.Mov = MovementType.EAST -> ({Mov= MovementType.NORTH; Offset= currentPosition.Offset}, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| (270, mov) when mov.Mov = MovementType.WEST -> ({Mov= MovementType.SOUTH; Offset= currentPosition.Offset}, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| _ -> failwith "Invalid turn right"
| MovementType.FORWARD ->
match currentPosition.Mov with
| MovementType.NORTH -> (currentPosition, [| { Mov = MovementType.NORTH; Offset = currentStatus.[0].Offset + movement.Offset }; currentStatus.[1]; currentStatus.[2]; currentStatus.[3] |])
| MovementType.SOUTH -> (currentPosition, [| currentStatus.[0]; { Mov = MovementType.SOUTH; Offset = currentStatus.[1].Offset + movement.Offset }; currentStatus.[2]; currentStatus.[3] |])
| MovementType.EAST -> (currentPosition, [| currentStatus.[0]; currentStatus.[1]; { Mov = MovementType.EAST; Offset = currentStatus.[2].Offset + movement.Offset }; currentStatus.[3] |])
| MovementType.WEST -> (currentPosition, [| currentStatus.[0]; currentStatus.[1]; currentStatus.[2]; { Mov = MovementType.WEST; Offset = currentStatus.[3].Offset + movement.Offset } |])
| _ -> failwith "Invalid forward"
newCurrentStatus
let rec findFinalPoint (start: MovementOperation) (currentStatus: MovementOperation[]) (operations: MovementOperation list) =
let newPosition = getNewPosition currentStatus start operations.Head
match operations.Tail.IsEmpty with
| true -> newPosition
| false -> findFinalPoint (fst newPosition) (snd newPosition) operations.Tail
let startPoint = { Mov = MovementType.EAST; Offset = 0 }
let startStatus = [| {Mov = MovementType.NORTH; Offset= 0}; {Mov = MovementType.SOUTH; Offset= 0}; {Mov = MovementType.EAST; Offset= 0}; {Mov = MovementType.WEST; Offset= 0} |]
let execute =
let final = findFinalPoint startPoint startStatus movements
abs((snd final).[0].Offset - (snd final).[1].Offset) + abs((snd final).[2].Offset - (snd final).[3].Offset)