Day 24 Part 1 + 2
This commit is contained in:
parent
241f983584
commit
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2 changed files with 222 additions and 0 deletions
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@ -38,6 +38,9 @@
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26DD9D2E259312410082D4F2 /* main.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26DD9D2D259312410082D4F2 /* main.swift */; };
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26DD9D49259312460082D4F2 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2ACE5257ED09000702405 /* Extensions.swift */; };
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26DD9D4A259312460082D4F2 /* LoadData.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2AD3A2581713A00702405 /* LoadData.swift */; };
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26DD9DDC25949F600082D4F2 /* main.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26DD9DDB25949F600082D4F2 /* main.swift */; };
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26DD9DF825949F690082D4F2 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2ACE5257ED09000702405 /* Extensions.swift */; };
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26DD9DF925949F690082D4F2 /* LoadData.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2AD3A2581713A00702405 /* LoadData.swift */; };
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26E2ACD8257ECFFA00702405 /* main.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2ACD7257ECFFA00702405 /* main.swift */; };
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26E2ACE6257ED09000702405 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2ACE5257ED09000702405 /* Extensions.swift */; };
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26E2ACE7257ED09000702405 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2ACE5257ED09000702405 /* Extensions.swift */; };
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@ -214,6 +217,15 @@
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);
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dstPath = /usr/share/man/man1/;
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files = (
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runOnlyForDeploymentPostprocessing = 1;
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26E2ACD3257ECFFA00702405 /* CopyFiles */ = {
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@ -319,6 +331,8 @@
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26DD9CF42591C4000082D4F2 /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
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26DD9D2B259312410082D4F2 /* day23 */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = day23; sourceTree = BUILT_PRODUCTS_DIR; };
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26DD9D2D259312410082D4F2 /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
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26DD9DD925949F600082D4F2 /* day24 */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = day24; sourceTree = BUILT_PRODUCTS_DIR; };
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26DD9DDB25949F600082D4F2 /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
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26E2ACD5257ECFFA00702405 /* day8 */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = day8; sourceTree = BUILT_PRODUCTS_DIR; };
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26E2ACD7257ECFFA00702405 /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
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26E2ACE5257ED09000702405 /* Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Extensions.swift; sourceTree = "<group>"; };
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@ -445,6 +459,13 @@
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);
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runOnlyForDeploymentPostprocessing = 0;
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26DD9DD625949F600082D4F2 /* Frameworks */ = {
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26E2ACD2257ECFFA00702405 /* Frameworks */ = {
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@ -547,6 +568,7 @@
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26DD9CA72590759B0082D4F2 /* day21 */,
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26DD9CF32591C4000082D4F2 /* day22 */,
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26DD9D2C259312410082D4F2 /* day23 */,
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26DD9DDA25949F600082D4F2 /* day24 */,
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268D953A25781DD80030EC4D /* Products */,
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);
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sourceTree = "<group>";
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@ -577,6 +599,7 @@
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26DD9CA62590759B0082D4F2 /* day21 */,
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26DD9CF22591C4000082D4F2 /* day22 */,
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26DD9D2B259312410082D4F2 /* day23 */,
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26DD9DD925949F600082D4F2 /* day24 */,
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);
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name = Products;
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sourceTree = "<group>";
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@ -685,6 +708,14 @@
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path = day23;
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sourceTree = "<group>";
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};
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26DD9DDA25949F600082D4F2 /* day24 */ = {
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isa = PBXGroup;
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children = (
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26DD9DDB25949F600082D4F2 /* main.swift */,
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);
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path = day24;
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sourceTree = "<group>";
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};
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26E2ACD6257ECFFA00702405 /* day8 */ = {
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isa = PBXGroup;
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children = (
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@ -1016,6 +1047,23 @@
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productReference = 26DD9D2B259312410082D4F2 /* day23 */;
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productType = "com.apple.product-type.tool";
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};
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26DD9DD825949F600082D4F2 /* day24 */ = {
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isa = PBXNativeTarget;
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buildConfigurationList = 26DD9DDF25949F600082D4F2 /* Build configuration list for PBXNativeTarget "day24" */;
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buildPhases = (
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26DD9DD525949F600082D4F2 /* Sources */,
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26DD9DD625949F600082D4F2 /* Frameworks */,
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26DD9DD725949F600082D4F2 /* CopyFiles */,
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);
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buildRules = (
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);
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dependencies = (
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);
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name = day24;
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productName = day24;
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productReference = 26DD9DD925949F600082D4F2 /* day24 */;
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productType = "com.apple.product-type.tool";
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};
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26E2ACD4257ECFFA00702405 /* day8 */ = {
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isa = PBXNativeTarget;
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buildConfigurationList = 26E2ACDB257ECFFA00702405 /* Build configuration list for PBXNativeTarget "day8" */;
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@ -1206,6 +1254,9 @@
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26DD9D2A259312410082D4F2 = {
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CreatedOnToolsVersion = 12.3;
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};
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26DD9DD825949F600082D4F2 = {
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CreatedOnToolsVersion = 12.3;
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};
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26E2ACD4257ECFFA00702405 = {
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CreatedOnToolsVersion = 12.2;
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};
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@ -1268,6 +1319,7 @@
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26DD9CA52590759B0082D4F2 /* day21 */,
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26DD9CF12591C4000082D4F2 /* day22 */,
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26DD9D2A259312410082D4F2 /* day23 */,
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26DD9DD825949F600082D4F2 /* day24 */,
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);
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};
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/* End PBXProject section */
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@ -1423,6 +1475,16 @@
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);
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runOnlyForDeploymentPostprocessing = 0;
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26DD9DD525949F600082D4F2 /* Sources */ = {
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files = (
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26DD9DDC25949F600082D4F2 /* main.swift in Sources */,
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26DD9DF825949F690082D4F2 /* Extensions.swift in Sources */,
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26DD9DF925949F690082D4F2 /* LoadData.swift in Sources */,
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);
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runOnlyForDeploymentPostprocessing = 0;
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};
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26E2ACD1257ECFFA00702405 /* Sources */ = {
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@ -1969,6 +2031,28 @@
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};
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name = Release;
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};
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26DD9DDD25949F600082D4F2 /* Debug */ = {
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buildSettings = {
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CODE_SIGN_STYLE = Automatic;
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DEVELOPMENT_TEAM = 722B335UM5;
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ENABLE_HARDENED_RUNTIME = YES;
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PRODUCT_NAME = "$(TARGET_NAME)";
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SWIFT_VERSION = 5.0;
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};
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name = Debug;
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};
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26DD9DDE25949F600082D4F2 /* Release */ = {
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buildSettings = {
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CODE_SIGN_STYLE = Automatic;
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DEVELOPMENT_TEAM = 722B335UM5;
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ENABLE_HARDENED_RUNTIME = YES;
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PRODUCT_NAME = "$(TARGET_NAME)";
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SWIFT_VERSION = 5.0;
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};
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name = Release;
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};
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26E2ACD9257ECFFA00702405 /* Debug */ = {
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isa = XCBuildConfiguration;
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buildSettings = {
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@ -2308,6 +2392,15 @@
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defaultConfigurationIsVisible = 0;
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defaultConfigurationName = Release;
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};
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26DD9DDF25949F600082D4F2 /* Build configuration list for PBXNativeTarget "day24" */ = {
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isa = XCConfigurationList;
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buildConfigurations = (
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26DD9DDD25949F600082D4F2 /* Debug */,
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26DD9DDE25949F600082D4F2 /* Release */,
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);
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defaultConfigurationIsVisible = 0;
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defaultConfigurationName = Release;
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};
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26E2ACDB257ECFFA00702405 /* Build configuration list for PBXNativeTarget "day8" */ = {
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isa = XCConfigurationList;
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buildConfigurations = (
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129
day24/main.swift
Normal file
129
day24/main.swift
Normal file
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@ -0,0 +1,129 @@
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import Foundation
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let input = loadData(day: 24)
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let scanner = Scanner(string: input)
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scanner.charactersToBeSkipped = nil
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enum Direction: String, CaseIterable {
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case east = "e"
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case southEast = "se"
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case southWest = "sw"
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case west = "w"
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case northWest = "nw"
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case northEast = "ne"
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}
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extension Scanner {
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func readDirection() -> Direction? {
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for dir in Direction.allCases {
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if string(dir.rawValue) {
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return dir
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}
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}
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return nil
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}
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}
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struct Coord: Hashable {
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var south: Int
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var east: Int
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static let zero = Coord(south: 0, east: 0)
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mutating func move(_ direction: Direction) {
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switch direction {
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case .east:
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east += 1
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case .southEast:
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south += 1
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case .southWest:
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south += 1
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east -= 1
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case .west:
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east -= 1
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case .northWest:
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south -= 1
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case .northEast:
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south -= 1
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east += 1
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}
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}
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func neighbor(_ direction: Direction) -> Coord {
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var result = self
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result.move(direction)
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return result
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}
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var neighbors: [Coord] {
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Direction.allCases.map(neighbor)
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}
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}
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func readCoordinate() -> Coord {
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var current = Coord.zero
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while let direction = scanner.readDirection() {
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current.move(direction)
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}
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precondition(scanner.string("\n"))
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return current
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}
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var floor: [Coord: Bool] = [:]
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var northWestCorner = Coord.zero
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var southEastCorner = Coord.zero
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func expandRange(toInclude coord: Coord) {
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northWestCorner.east = min(northWestCorner.east, coord.east)
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northWestCorner.south = min(northWestCorner.south, coord.south)
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southEastCorner.east = max(southEastCorner.east, coord.east)
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southEastCorner.south = max(southEastCorner.south, coord.south)
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}
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while !scanner.isAtEnd {
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let coord = readCoordinate()
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expandRange(toInclude: coord)
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floor[coord, default: false].toggle()
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}
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print("part 1:", floor.values.lazy.filter { $0 }.count)
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func step() -> [Coord: Bool] {
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var result = floor
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for east in (northWestCorner.east - 1)...(southEastCorner.east + 1) {
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for south in (northWestCorner.south - 1)...(southEastCorner.south + 1) {
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let coord = Coord(south: south, east: east)
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let isBlack = floor[coord, default: false]
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let blackNeighbors = coord.neighbors
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.lazy
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.map { floor[$0, default: false] }
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.filter { $0 }
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.count
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if isBlack && (blackNeighbors == 0 || blackNeighbors > 2) {
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result[coord] = false
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} else if !isBlack && blackNeighbors == 2 {
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result[coord] = true
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expandRange(toInclude: coord)
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}
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}
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}
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return result
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}
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for _ in 0..<100 {
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floor = step()
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}
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print("part 2:", floor.values.lazy.filter { $0 }.count)
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