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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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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 */; }; 26E2ACE6257ED09000702405 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 26E2ACE5257ED09000702405 /* Extensions.swift */; };
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@ -226,6 +229,15 @@
); );
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@ -333,6 +345,8 @@
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26E2ACE5257ED09000702405 /* Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Extensions.swift; sourceTree = "<group>"; }; 26E2ACE5257ED09000702405 /* Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Extensions.swift; sourceTree = "<group>"; };
@ -466,6 +480,13 @@
); );
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@ -569,6 +590,7 @@
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26DD9D2C259312410082D4F2 /* day23 */, 26DD9D2C259312410082D4F2 /* day23 */,
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26DD9E172595E71E0082D4F2 /* day25 */,
268D953A25781DD80030EC4D /* Products */, 268D953A25781DD80030EC4D /* Products */,
); );
sourceTree = "<group>"; sourceTree = "<group>";
@ -600,6 +622,7 @@
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26DD9E162595E71E0082D4F2 /* day25 */,
); );
name = Products; name = Products;
sourceTree = "<group>"; sourceTree = "<group>";
@ -716,6 +739,14 @@
path = day24; path = day24;
sourceTree = "<group>"; sourceTree = "<group>";
}; };
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isa = PBXGroup;
children = (
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);
path = day25;
sourceTree = "<group>";
};
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isa = PBXGroup; isa = PBXGroup;
children = ( children = (
@ -1064,6 +1095,23 @@
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productType = "com.apple.product-type.tool"; productType = "com.apple.product-type.tool";
}; };
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);
buildRules = (
);
dependencies = (
);
name = day25;
productName = day25;
productReference = 26DD9E162595E71E0082D4F2 /* day25 */;
productType = "com.apple.product-type.tool";
};
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@ -1257,6 +1305,9 @@
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}; };
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};
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@ -1320,6 +1371,7 @@
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); );
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/* End PBXProject section */ /* End PBXProject section */
@ -1485,6 +1537,16 @@
); );
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26DD9E372595E7290082D4F2 /* Extensions.swift in Sources */,
26DD9E362595E7290082D4F2 /* LoadData.swift in Sources */,
);
runOnlyForDeploymentPostprocessing = 0;
};
26E2ACD1257ECFFA00702405 /* Sources */ = { 26E2ACD1257ECFFA00702405 /* Sources */ = {
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@ -2053,6 +2115,28 @@
}; };
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}; };
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buildSettings = {
CODE_SIGN_STYLE = Automatic;
DEVELOPMENT_TEAM = 722B335UM5;
ENABLE_HARDENED_RUNTIME = YES;
PRODUCT_NAME = "$(TARGET_NAME)";
SWIFT_VERSION = 5.0;
};
name = Debug;
};
26DD9E1B2595E71E0082D4F2 /* Release */ = {
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buildSettings = {
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PRODUCT_NAME = "$(TARGET_NAME)";
SWIFT_VERSION = 5.0;
};
name = Release;
};
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@ -2401,6 +2485,15 @@
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}; };
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defaultConfigurationName = Release;
};
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buildConfigurations = ( 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)