{"header":{"message":"Complete day3 for F#!","description":null,"timestamp":"2020-12-03T17:51:28.270013798Z","authors":[{"email":"krixano@protonmail.com","full_name":"Christian Lee Seibold","name":"krixano"}]},"hash":"PKDWHQ7LCBXYWTNXEQUTKE65KLRXZ7GW3PWIK3A65S4F27RH2TGQC","authors":[],"deps":{"hashes":[["PKDWHQ7LCBXYWTNXEQUTKE65KLRXZ7GW3PWIK3A65S4F27RH2TGQC","Complete day3 for F#!"],["AA",null],["BXVXNVBVDK5R3N2XSSP7YQZDR4O7ZS6UX6FUDAYL5UPCJ2Q6A3CQC","Remove commented out code"],["OHEKH6Q3CVVLL5BMLZ4JAV3HCVRWRUYQQQ7CYSXXMKYHKNSSLK2AC","Initial"],["W7RKL7EQWB4HARQS4XASRQOA2KUK5XZWJU3ZYMMKDQKF4WUQLFVAC","Simplified and more performant F# solution for day1 problem - using query expressions (and find)"],["375ZPTJI3CGXABED4AINT5EWG5LUS4MMCIGBAV5V6BZZ7CQDI76QC","Day 3 in Odin"],["6GABX6MKNIXO42MHR7ZZD5GLN7WLYYTJHOHHKUEB5LW32GDKBU4AC","Day 2 for Odin"]],"deps":["BXVXNVBVDK5R3N2XSSP7YQZDR4O7ZS6UX6FUDAYL5UPCJ2Q6A3CQC"],"known":["OHEKH6Q3CVVLL5BMLZ4JAV3HCVRWRUYQQQ7CYSXXMKYHKNSSLK2AC","6GABX6MKNIXO42MHR7ZZD5GLN7WLYYTJHOHHKUEB5LW32GDKBU4AC","W7RKL7EQWB4HARQS4XASRQOA2KUK5XZWJU3ZYMMKDQKF4WUQLFVAC","375ZPTJI3CGXABED4AINT5EWG5LUS4MMCIGBAV5V6BZZ7CQDI76QC"]},"hunks":[{"FileAdd":{"meta":{"basename":"day3","metadata":1021},"context":[{"change":3,"pos":230427}],"contents":[]}},{"FileAdd":{"meta":{"basename":"main.fs","metadata":436},"context":[{"change":0,"pos":7}],"contents":[{"Add":"open System.IO"},{"Add":""},{"Add":"let readLines (filePath: string) = seq {"},{"Add":" use sr = new StreamReader (filePath)"},{"Add":" while not sr.EndOfStream do"},{"Add":" yield sr.ReadLine()"},{"Add":"}"},{"Add":""},{"Add":"type Pos = { x: int; y: int }"},{"Add":"type Slope = { x: int; y: int }"},{"Add":"type Tile ="},{"Add":" | Open"},{"Add":" | Tree"},{"Add":"type Map = { tiles: Tile list list }"},{"Add":""},{"Add":"let createMap (lines: string seq): Map ="},{"Add":" { Map.tiles = ["},{"Add":" for line in lines do"},{"Add":" [ for char in line do"},{"Add":" if char = '#' then"},{"Add":" Tile.Tree"},{"Add":" else Tile.Open ]"},{"Add":" ] }"},{"Add":"let getMaxPos (map: Map): Pos ="},{"Add":" { Pos.x = map.tiles.[0].Length - 1; y = map.tiles.Length - 1 }"},{"Add":""},{"Add":"let advancePos (pos: Pos) (slope: Slope) (maxPos: Pos): (bool * Pos) ="},{"Add":" if (pos.y + slope.y > maxPos.y) then"},{"Add":" (true, pos)"},{"Add":" else"},{"Add":" if pos.x + slope.x > maxPos.x then"},{"Add":" (false, { Pos.x = ((pos.x + slope.x) % maxPos.x) - 1; y = pos.y + slope.y })"},{"Add":" else"},{"Add":" (false, { Pos.x = pos.x + slope.x; y = pos.y + slope.y })"},{"Add":""},{"Add":"let rec checkSlope (map: Map) (pos: Pos) (slope: Slope) (maxPos: Pos) (count: int64): int64 ="},{"Add":" match advancePos pos slope maxPos with"},{"Add":" | (true, { Pos.x = x; Pos.y = y }) -> count"},{"Add":" | (false, { Pos.x = x; Pos.y = y }) -> "},{"Add":" if map.tiles.[y].[x] = Tile.Tree then"},{"Add":" checkSlope map { Pos.x = x; Pos.y = y } slope maxPos (count + 1L)"},{"Add":" else checkSlope map { Pos.x = x; Pos.y = y } slope maxPos (count)"},{"Add":""},{"Add":"[]"},{"Add":"let main argv ="},{"Add":" let lines = readLines \"input.txt\""},{"Add":" let map = createMap lines"},{"Add":" let maxPos = getMaxPos map"},{"Add":""},{"Add":" let count1 = checkSlope map { Pos.x = 0; y = 0 } { Slope.x = 1; y = 1 } maxPos 0L"},{"Add":" let count2 = checkSlope map { Pos.x = 0; y = 0 } { Slope.x = 3; y = 1 } maxPos 0L"},{"Add":" let count3 = checkSlope map { Pos.x = 0; y = 0 } { Slope.x = 5; y = 1 } maxPos 0L"},{"Add":" let count4 = checkSlope map { Pos.x = 0; y = 0 } { Slope.x = 7; y = 1 } maxPos 0L"},{"Add":" let count5 = checkSlope map { Pos.x = 0; y = 0 } { Slope.x = 1; y = 2 } maxPos 0L"},{"Add":""},{"Add":" let part1 = count2"},{"Add":" let part2 = count1 * count2 * count3 * count4 * count5"},{"Add":""},{"Add":" printf \"%d, %d\\n\" part1 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…

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