From aaab01f178d2a789ef9d79c85512fc73f4b6119c Mon Sep 17 00:00:00 2001 From: Dreaded_X Date: Wed, 22 Dec 2021 22:12:11 +0100 Subject: [PATCH] 2021 - Day 22 --- 2021/22/go.mod | 9 ++ 2021/22/go.sum | 2 + 2021/22/main.go | 321 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 332 insertions(+) create mode 100644 2021/22/go.mod create mode 100644 2021/22/go.sum create mode 100644 2021/22/main.go diff --git a/2021/22/go.mod b/2021/22/go.mod new file mode 100644 index 0000000..5af9f92 --- /dev/null +++ b/2021/22/go.mod @@ -0,0 +1,9 @@ +module AoC/2021/22 + +require AoC/2021/common v0.0.0 + +require github.com/joho/godotenv v1.4.0 // indirect + +replace AoC/2021/common v0.0.0 => ../common + +go 1.17 diff --git a/2021/22/go.sum b/2021/22/go.sum new file mode 100644 index 0000000..8c9f290 --- /dev/null +++ b/2021/22/go.sum @@ -0,0 +1,2 @@ +github.com/joho/godotenv v1.4.0 h1:3l4+N6zfMWnkbPEXKng2o2/MR5mSwTrBih4ZEkkz1lg= +github.com/joho/godotenv v1.4.0/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4= diff --git a/2021/22/main.go b/2021/22/main.go new file mode 100644 index 0000000..3c4919c --- /dev/null +++ b/2021/22/main.go @@ -0,0 +1,321 @@ +package main + +import ( + aoc "AoC/2021/common" + "bufio" + "fmt" + "regexp" + "strconv" + "strings" +) + +type Vec3 struct { + x int + y int + z int +} + +func (a Vec3) Equals(b Vec3) bool { + return a.x == b.x && a.y == b.y && a.z == b.z +} + +type Cuboid struct { + min Vec3 + max Vec3 + on bool +} + +func max(a int, b int) int { + if a > b { + return a + } + return b +} + +func min(a int, b int) int { + if a < b { + return a + } + return b +} + +func (a Cuboid) Overlap(b Cuboid) (*Cuboid, error) { + var o Cuboid + o.min.x = max(a.min.x, b.min.x) + o.max.x = min(a.max.x, b.max.x) + + o.min.y = max(a.min.y, b.min.y) + o.max.y = min(a.max.y, b.max.y) + + o.min.z = max(a.min.z, b.min.z) + o.max.z = min(a.max.z, b.max.z) + + if o.min.x > o.max.x || o.min.y > o.max.y || o.min.z > o.max.z { + return nil, fmt.Errorf("No overlap") + } + + + return &o, nil +} + +func (c Cuboid) Size() int { + // We do plus one because it is inclusive + size := (c.max.x-c.min.x+1) * (c.max.y-c.min.y+1) * (c.max.z-c.min.z+1) + return size +} + +func (a Cuboid) Equals(b Cuboid) bool { + return a.on == b.on && a.min.Equals(b.min) && a.max.Equals(b.max) +} + +func insert(a []Cuboid, index int, value Cuboid) []Cuboid { + if len(a) == index { // nil or empty slice or after last element + return append(a, value) + } + a = append(a[:index+1], a[index:]...) // index < len(a) + a[index] = value + return a +} + + +func processInput(input *bufio.Scanner) []Cuboid { + var cuboids []Cuboid + + r := regexp.MustCompile("-?[0-9]+") + for input.Scan() { + line := input.Text() + var cuboid Cuboid + cuboid.on = strings.Contains(line, "on") + { + var coords []int + num := r.FindAllString(line, -1) + for _, n := range num { + c, _ := strconv.Atoi(n) + coords = append(coords, c) + } + + cuboid.min.x = coords[0] + cuboid.max.x = coords[1] + cuboid.min.y = coords[2] + cuboid.max.y = coords[3] + cuboid.min.z = coords[4] + cuboid.max.z = coords[5] + } + + cuboids = append(cuboids, cuboid) + } + + return cuboids +} + +// This functions returns the amount of cubes in the cuboid that will not change after a given index +func (c *Cuboid) Reduce(index int, cuboids []Cuboid) int { + // Start with the full size of the cuboid + space := c.Size() + + for j := index+1; j < len(cuboids); j++ { + overlap, err := c.Overlap(cuboids[j]) + if err != nil { + // There is no overlap + continue + } + + // Removed the cubes that are going to be removed in a next step + space -= overlap.Reduce(j, cuboids) + } + + return space +} + +func main() { + challenge := aoc.New(2021, 22) + + challenge.Test(`on x=10..12,y=10..12,z=0..0 +on x=11..13,y=11..13,z=0..0 +off x=9..11,y=9..11,z=0..0 +on x=10..10,y=10..10,z=0..0`, []int{11, 11}) + + challenge.Test(`on x=10..12,y=10..12,z=10..12 +on x=11..13,y=11..13,z=11..13 +off x=9..11,y=9..11,z=9..11 +on x=10..10,y=10..10,z=10..10`, []int{39, 39}) + + challenge.Test(`on x=-20..26,y=-36..17,z=-47..7 +on x=-20..33,y=-21..23,z=-26..28 +on x=-22..28,y=-29..23,z=-38..16 +on x=-46..7,y=-6..46,z=-50..-1 +on x=-49..1,y=-3..46,z=-24..28 +on x=2..47,y=-22..22,z=-23..27 +on x=-27..23,y=-28..26,z=-21..29 +on x=-39..5,y=-6..47,z=-3..44 +on x=-30..21,y=-8..43,z=-13..34 +on x=-22..26,y=-27..20,z=-29..19 +off x=-48..-32,y=26..41,z=-47..-37 +on x=-12..35,y=6..50,z=-50..-2 +off x=-48..-32,y=-32..-16,z=-15..-5 +on x=-18..26,y=-33..15,z=-7..46 +off x=-40..-22,y=-38..-28,z=23..41 +on x=-16..35,y=-41..10,z=-47..6 +off x=-32..-23,y=11..30,z=-14..3 +on x=-49..-5,y=-3..45,z=-29..18 +off x=18..30,y=-20..-8,z=-3..13 +on x=-41..9,y=-7..43,z=-33..15`, []int{590784, 590784}) + + challenge.Test(`on x=-20..26,y=-36..17,z=-47..7 +on x=-20..33,y=-21..23,z=-26..28 +on x=-22..28,y=-29..23,z=-38..16 +on x=-46..7,y=-6..46,z=-50..-1 +on x=-49..1,y=-3..46,z=-24..28 +on x=2..47,y=-22..22,z=-23..27 +on x=-27..23,y=-28..26,z=-21..29 +on x=-39..5,y=-6..47,z=-3..44 +on x=-30..21,y=-8..43,z=-13..34 +on x=-22..26,y=-27..20,z=-29..19 +off x=-48..-32,y=26..41,z=-47..-37 +on x=-12..35,y=6..50,z=-50..-2 +off x=-48..-32,y=-32..-16,z=-15..-5 +on x=-18..26,y=-33..15,z=-7..46 +off x=-40..-22,y=-38..-28,z=23..41 +on x=-16..35,y=-41..10,z=-47..6 +off x=-32..-23,y=11..30,z=-14..3 +on x=-49..-5,y=-3..45,z=-29..18 +off x=18..30,y=-20..-8,z=-3..13 +on x=-41..9,y=-7..43,z=-33..15 +on x=-54112..-39298,y=-85059..-49293,z=-27449..7877 +on x=967..23432,y=45373..81175,z=27513..53682`, []int{590784, -2}) + + challenge.Test(`on x=-5..47,y=-31..22,z=-19..33 +on x=-44..5,y=-27..21,z=-14..35 +on x=-49..-1,y=-11..42,z=-10..38 +on x=-20..34,y=-40..6,z=-44..1 +off x=26..39,y=40..50,z=-2..11 +on x=-41..5,y=-41..6,z=-36..8 +off x=-43..-33,y=-45..-28,z=7..25 +on x=-33..15,y=-32..19,z=-34..11 +off x=35..47,y=-46..-34,z=-11..5 +on x=-14..36,y=-6..44,z=-16..29 +on x=-57795..-6158,y=29564..72030,z=20435..90618 +on x=36731..105352,y=-21140..28532,z=16094..90401 +on x=30999..107136,y=-53464..15513,z=8553..71215 +on x=13528..83982,y=-99403..-27377,z=-24141..23996 +on x=-72682..-12347,y=18159..111354,z=7391..80950 +on x=-1060..80757,y=-65301..-20884,z=-103788..-16709 +on x=-83015..-9461,y=-72160..-8347,z=-81239..-26856 +on x=-52752..22273,y=-49450..9096,z=54442..119054 +on x=-29982..40483,y=-108474..-28371,z=-24328..38471 +on x=-4958..62750,y=40422..118853,z=-7672..65583 +on x=55694..108686,y=-43367..46958,z=-26781..48729 +on x=-98497..-18186,y=-63569..3412,z=1232..88485 +on x=-726..56291,y=-62629..13224,z=18033..85226 +on x=-110886..-34664,y=-81338..-8658,z=8914..63723 +on x=-55829..24974,y=-16897..54165,z=-121762..-28058 +on x=-65152..-11147,y=22489..91432,z=-58782..1780 +on x=-120100..-32970,y=-46592..27473,z=-11695..61039 +on x=-18631..37533,y=-124565..-50804,z=-35667..28308 +on x=-57817..18248,y=49321..117703,z=5745..55881 +on x=14781..98692,y=-1341..70827,z=15753..70151 +on x=-34419..55919,y=-19626..40991,z=39015..114138 +on x=-60785..11593,y=-56135..2999,z=-95368..-26915 +on x=-32178..58085,y=17647..101866,z=-91405..-8878 +on x=-53655..12091,y=50097..105568,z=-75335..-4862 +on x=-111166..-40997,y=-71714..2688,z=5609..50954 +on x=-16602..70118,y=-98693..-44401,z=5197..76897 +on x=16383..101554,y=4615..83635,z=-44907..18747 +off x=-95822..-15171,y=-19987..48940,z=10804..104439 +on x=-89813..-14614,y=16069..88491,z=-3297..45228 +on x=41075..99376,y=-20427..49978,z=-52012..13762 +on x=-21330..50085,y=-17944..62733,z=-112280..-30197 +on x=-16478..35915,y=36008..118594,z=-7885..47086 +off x=-98156..-27851,y=-49952..43171,z=-99005..-8456 +off x=2032..69770,y=-71013..4824,z=7471..94418 +on x=43670..120875,y=-42068..12382,z=-24787..38892 +off x=37514..111226,y=-45862..25743,z=-16714..54663 +off x=25699..97951,y=-30668..59918,z=-15349..69697 +off x=-44271..17935,y=-9516..60759,z=49131..112598 +on x=-61695..-5813,y=40978..94975,z=8655..80240 +off x=-101086..-9439,y=-7088..67543,z=33935..83858 +off x=18020..114017,y=-48931..32606,z=21474..89843 +off x=-77139..10506,y=-89994..-18797,z=-80..59318 +off x=8476..79288,y=-75520..11602,z=-96624..-24783 +on x=-47488..-1262,y=24338..100707,z=16292..72967 +off x=-84341..13987,y=2429..92914,z=-90671..-1318 +off x=-37810..49457,y=-71013..-7894,z=-105357..-13188 +off x=-27365..46395,y=31009..98017,z=15428..76570 +off x=-70369..-16548,y=22648..78696,z=-1892..86821 +on x=-53470..21291,y=-120233..-33476,z=-44150..38147 +off x=-93533..-4276,y=-16170..68771,z=-104985..-24507`, []int{-2, 2758514936282235}) + + challenge.Solution(1, func(input *bufio.Scanner) int { + cuboids := processInput(input) + + grid := make(map[Vec3]bool) + + min := Vec3{50, 50, 50} + max := Vec3{-50, -50, -50} + for _, c := range cuboids { + for x := c.min.x; x <= c.max.x; x++ { + if x > 50 || x < -50 { + continue + } + if x < min.x { + min.x = x + } + if x > max.x { + max.x = x + } + for y := c.min.y; y <= c.max.y; y++ { + if y > 50 || y < -50 { + continue + } + if y < min.y { + min.y = y + } + if y > max.y { + max.y = y + } + for z := c.min.z; z <= c.max.z; z++ { + if z > 50 || z < -50 { + continue + } + if z < min.z { + min.z = z + } + if z > max.z { + max.z = z + } + pos := Vec3{x, y, z} + + grid[pos] = c.on + } + } + } + } + + counter := 0 + for x := min.x; x <= max.x; x++ { + for y := min.y; y <= max.y; y++ { + for z := min.z; z <= max.z; z++ { + pos := Vec3{x, y, z} + if grid[pos] { + counter++ + } + } + } + } + + return counter + }) + + challenge.Solution(2, func(input *bufio.Scanner) int { + cuboids := processInput(input) + + sum := 0 + for i := range cuboids { + if cuboids[i].on { + sum += cuboids[i].Reduce(i, cuboids) + } + } + + return sum + }) +}