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Day 25

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This commit is contained in:
Sven Weidauer 2020-12-25 10:53:54 +01:00
parent 7b35583b63
commit 057729328f
2 changed files with 128 additions and 0 deletions
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93
AdventOfCode2020.xcodeproj/project.pbxproj
View file

@ -41,6 +41,9 @@
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26DD9DF925949F690082D4F2 /* LoadData.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2AD3A2581713A00702405 /* LoadData.swift */; };
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26DD9E372595E7290082D4F2 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2ACE5257ED09000702405 /* Extensions.swift */; };
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26E2ACE6257ED09000702405 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2ACE5257ED09000702405 /* Extensions.swift */; };
26E2ACE7257ED09000702405 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2ACE5257ED09000702405 /* Extensions.swift */; };
@ -226,6 +229,15 @@
);
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};
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files = (
);
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26E2ACD3257ECFFA00702405 /* CopyFiles */ = {
isa = PBXCopyFilesBuildPhase;
buildActionMask = 2147483647;
@ -333,6 +345,8 @@
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26E2ACD7257ECFFA00702405 /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
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@ -466,6 +480,13 @@
);
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@ -569,6 +590,7 @@
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26DD9D2C259312410082D4F2 /* day23 */,
26DD9DDA25949F600082D4F2 /* day24 */,
26DD9E172595E71E0082D4F2 /* day25 */,
268D953A25781DD80030EC4D /* Products */,
);
sourceTree = "<group>";
@ -600,6 +622,7 @@
26DD9CF22591C4000082D4F2 /* day22 */,
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26DD9E162595E71E0082D4F2 /* day25 */,
);
name = Products;
sourceTree = "<group>";
@ -716,6 +739,14 @@
path = day24;
sourceTree = "<group>";
};
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isa = PBXGroup;
children = (
26DD9E182595E71E0082D4F2 /* main.swift */,
);
path = day25;
sourceTree = "<group>";
};
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isa = PBXGroup;
children = (
@ -1064,6 +1095,23 @@
productReference = 26DD9DD925949F600082D4F2 /* day24 */;
productType = "com.apple.product-type.tool";
};
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26DD9E132595E71E0082D4F2 /* Frameworks */,
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);
buildRules = (
);
dependencies = (
);
name = day25;
productName = day25;
productReference = 26DD9E162595E71E0082D4F2 /* day25 */;
productType = "com.apple.product-type.tool";
};
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isa = PBXNativeTarget;
buildConfigurationList = 26E2ACDB257ECFFA00702405 /* Build configuration list for PBXNativeTarget "day8" */;
@ -1257,6 +1305,9 @@
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26DD9E152595E71E0082D4F2 = {
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};
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CreatedOnToolsVersion = 12.2;
};
@ -1320,6 +1371,7 @@
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26DD9DD825949F600082D4F2 /* day24 */,
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);
};
/* End PBXProject section */
@ -1485,6 +1537,16 @@
);
runOnlyForDeploymentPostprocessing = 0;
};
26DD9E122595E71E0082D4F2 /* Sources */ = {
isa = PBXSourcesBuildPhase;
buildActionMask = 2147483647;
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26DD9E192595E71E0082D4F2 /* main.swift in Sources */,
26DD9E372595E7290082D4F2 /* Extensions.swift in Sources */,
26DD9E362595E7290082D4F2 /* LoadData.swift in Sources */,
);
runOnlyForDeploymentPostprocessing = 0;
};
26E2ACD1257ECFFA00702405 /* Sources */ = {
isa = PBXSourcesBuildPhase;
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@ -2053,6 +2115,28 @@
};
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};
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isa = XCBuildConfiguration;
buildSettings = {
CODE_SIGN_STYLE = Automatic;
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ENABLE_HARDENED_RUNTIME = YES;
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};
name = Debug;
};
26DD9E1B2595E71E0082D4F2 /* Release */ = {
isa = XCBuildConfiguration;
buildSettings = {
CODE_SIGN_STYLE = Automatic;
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PRODUCT_NAME = "$(TARGET_NAME)";
SWIFT_VERSION = 5.0;
};
name = Release;
};
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@ -2401,6 +2485,15 @@
defaultConfigurationIsVisible = 0;
defaultConfigurationName = Release;
};
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isa = XCConfigurationList;
buildConfigurations = (
26DD9E1A2595E71E0082D4F2 /* Debug */,
26DD9E1B2595E71E0082D4F2 /* Release */,
);
defaultConfigurationIsVisible = 0;
defaultConfigurationName = Release;
};
26E2ACDB257ECFFA00702405 /* Build configuration list for PBXNativeTarget "day8" */ = {
isa = XCConfigurationList;
buildConfigurations = (

35
day25/main.swift Normal file
View file

@ -0,0 +1,35 @@
import Foundation
let input = loadData(day: 25).lines().compactMap(Int.init)
func loop(subject: Int, times: Int) -> Int {
var value = 1
for _ in 0..<times {
value = (value * subject) % 20201227
}
return value
}
func findLoopSize(subject: Int, expected: Int) -> Int {
var value = 1
for i in 0...Int.max {
if value == expected {
return i
}
value = (value * subject) % 20201227
}
return -1
}
let sizes = input.map { findLoopSize(subject: 7, expected: $0) }
print(sizes)
let (pub1, pub2) = (input[0], input[1])
let (loop1, loop2) = (sizes[0], sizes[1])
let secret1 = loop(subject: pub2, times: loop1)
let secret2 = loop(subject: pub1, times: loop2)
print(secret1, secret2)