Day 17
This commit is contained in:
parent
92e0895ed2
commit
3ba710552d
2 changed files with 170 additions and 0 deletions
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@ -19,6 +19,8 @@
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263CCF6A276606010061B353 /* day11.swift in Sources */ = {isa = PBXBuildFile; fileRef = 263CCF69276606010061B353 /* day11.swift */; };
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@ -95,6 +97,15 @@
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@ -148,6 +159,8 @@
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263CCF69276606010061B353 /* day11.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = day11.swift; sourceTree = "<group>"; };
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263CCF6F2766065B0061B353 /* Day12 */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = Day12; sourceTree = BUILT_PRODUCTS_DIR; };
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263CCF76276606670061B353 /* day12.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = day12.swift; sourceTree = "<group>"; };
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263D3E2B276DDA5400B0AC5B /* Day17 */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = Day17; sourceTree = BUILT_PRODUCTS_DIR; };
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263D3E32276DDA6600B0AC5B /* day17.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = day17.swift; sourceTree = "<group>"; };
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2651128F2767D15A009B7607 /* Day13 */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = Day13; sourceTree = BUILT_PRODUCTS_DIR; };
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265112962767D16D009B7607 /* day13.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = day13.swift; sourceTree = "<group>"; };
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@ -209,6 +222,13 @@
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@ -243,6 +263,7 @@
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isa = PBXGroup;
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children = (
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263D3E32276DDA6600B0AC5B /* day17.swift */,
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26EA5DFF276BA680003E0305 /* day16.swift */,
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26155467276A6D0A00374D18 /* day15.swift */,
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26155459276A6C2C00374D18 /* day14.swift */,
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@ -273,6 +294,7 @@
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26155452276A6C1C00374D18 /* Day14 */,
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26155460276A6CF700374D18 /* Day15 */,
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26EA5DF7276BA668003E0305 /* Day16 */,
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263D3E2B276DDA5400B0AC5B /* Day17 */,
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name = Products;
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@ -399,6 +421,23 @@
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263D3E29276DDA5400B0AC5B /* CopyFiles */,
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buildRules = (
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dependencies = (
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name = Day17;
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productName = Day17;
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productReference = 263D3E2B276DDA5400B0AC5B /* Day17 */;
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productType = "com.apple.product-type.tool";
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@ -504,6 +543,10 @@
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263CCF6E2766065B0061B353 = {
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CreatedOnToolsVersion = 13.1;
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};
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263D3E2A276DDA5400B0AC5B = {
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CreatedOnToolsVersion = 13.2;
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LastSwiftMigration = 1320;
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2651128E2767D15A009B7607 = {
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@ -544,6 +587,7 @@
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26155451276A6C1C00374D18 /* Day14 */,
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2615545F276A6CF700374D18 /* Day15 */,
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26EA5DF6276BA668003E0305 /* Day16 */,
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263D3E2A276DDA5400B0AC5B /* Day17 */,
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/* End PBXProject section */
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@ -612,6 +656,15 @@
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263D3E33276DDA6600B0AC5B /* day17.swift in Sources */,
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@ -985,6 +1038,43 @@
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@ -1176,6 +1266,15 @@
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defaultConfigurationIsVisible = 0;
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defaultConfigurationName = Release;
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263D3E31276DDA5400B0AC5B /* Build configuration list for PBXNativeTarget "Day17" */ = {
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buildConfigurations = (
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71
day17.swift
Normal file
71
day17.swift
Normal file
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@ -0,0 +1,71 @@
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@main
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struct Day17: Puzzle {
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func run() {
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var maxHeight: Int = 0
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var count = 0
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for speedX in 1..<300 {
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for speedY in -600..<300 {
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if case .hit(let height) = run(vx: speedX, vy: speedY) {
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maxHeight = max(height, maxHeight)
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count += 1
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}
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}
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}
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print("Part 1:", maxHeight)
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print("Part 2:", count)
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}
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enum Result {
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case tooFar
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case tooShort
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case hit(height: Int)
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}
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struct Vector: Hashable {
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var x: Int
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var y: Int
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}
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func run(vx: Int, vy: Int) -> Result {
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var state = State(vx: vx, vy: vy)
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while state.x <= xMax && state.y >= yMin {
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state.step()
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if xMin...xMax ~= state.x && yMin...yMax ~= state.y {
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return .hit(height: state.maxHeight)
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}
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}
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if state.x > xMax {
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return .tooFar
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}
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return .tooShort
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}
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struct State {
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var vx: Int
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var vy: Int
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var x: Int = 0
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var y: Int = 0
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var maxHeight = 0
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mutating func step() {
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if y > maxHeight {
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maxHeight = y
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}
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x += vx
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y += vy
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vx -= vx.signum()
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vy -= 1
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}
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}
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// target area: x=138..184, y=-125..-71
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let xMin = 138
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let xMax = 184
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let yMin = -125
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let yMax = -71
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}
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