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Day 23 - Part 1

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Sven Weidauer 2020-12-24 07:58:28 +01:00
parent dc25ae1ea7
commit 395c30a952
2 changed files with 139 additions and 0 deletions
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93
AdventOfCode2020.xcodeproj/project.pbxproj
View file

@ -35,6 +35,9 @@
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@ -202,6 +205,15 @@
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@ -305,6 +317,8 @@
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@ -424,6 +438,13 @@
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@ -525,6 +546,7 @@
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@ -554,6 +576,7 @@
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@ -654,6 +677,14 @@
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@ -968,6 +999,23 @@
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@ -1155,6 +1203,9 @@
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@ -1216,6 +1267,7 @@
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@ -1361,6 +1413,16 @@
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26DD9D2E259312410082D4F2 /* main.swift in Sources */,
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26DD9D4A259312460082D4F2 /* LoadData.swift in Sources */,
);
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@ -1885,6 +1947,28 @@
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@ -2215,6 +2299,15 @@
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buildConfigurations = (

46
day23/main.swift Normal file
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@ -0,0 +1,46 @@
var stack = [9, 5, 2, 3, 1, 6, 4, 8, 7]
extension Array {
mutating func rotateLeft(mid: Index) {
let slice = self[0..<mid]
removeSubrange(0..<mid)
append(contentsOf: slice)
}
}
func round() {
let picked = stack[1 ... 3]
stack.removeSubrange(1 ... 3)
var destination = stack[0]
repeat {
destination -= 1
if destination < 1 {
destination = 9
}
} while picked.contains(destination)
let destinationIndex = stack.firstIndex(of: destination)! + 1
stack.insert(contentsOf: picked, at: destinationIndex)
stack.rotateLeft(mid: 1)
}
func printStack() {
for (offset, value) in stack.enumerated() {
print(offset == 0 ? "(\(value))" : "\(value)", terminator: " ")
}
print()
}
for i in 0..<100 {
print("\(i + 1)) ", terminator: "")
printStack()
round()
}
print("Final: ", terminator: "")
printStack()
let oneIndex = stack.firstIndex(of: 1)!
stack.rotateLeft(mid: (oneIndex + 1) % stack.count)
print(stack.dropLast().map {"\($0)"}.joined())