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Day 20

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Sven Weidauer 2021-12-20 13:01:42 +01:00
parent 879040b18a
commit 42f299d11b
2 changed files with 291 additions and 0 deletions
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99
AoC21.xcodeproj/project.pbxproj
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192
day20.swift Normal file
View file

@ -0,0 +1,192 @@
@main
struct Day20: Puzzle {
func run() {
var image = Image(input)
for i in 0..<50 {
image = image.run(map: map)
if i == 1 {
print("Part 1:", image.countLitPixels())
}
}
print("Part 2:", image.countLitPixels())
}
}
struct Image {
var width: Int
var height: Int
var pixels: [Bool]
var border: Bool
init(_ string: String) {
pixels = []
width = 0
height = 1
border = false
for char in string {
if char.isNewline {
width = 0
height += 1
continue
}
pixels.append(char == "#")
width += 1
}
}
init(width: Int, height: Int, border: Bool) {
self.width = width
self.height = height
self.border = border
self.pixels = Array(repeating: false, count: width * height)
}
subscript(x: Int, y: Int) -> Bool {
get {
guard 0..<width ~= x && 0..<height ~= y else {
return border
}
return pixels[x + width * y]
}
set {
precondition(0..<width ~= x && 0..<height ~= y)
pixels[x + width * y] = newValue
}
}
var borderIndex: Int { border ? 7 : 0 }
func lookupIndex(x: Int, y: Int) -> Int {
var index = 0
for i in -1...1 {
for j in -1...1 {
index = index << 1 | (self[x + j, y + i] ? 1 : 0)
}
}
return index
}
func run(map: [Bool]) -> Image {
var outputImage = Image(width: width + 2, height: height + 2, border: map[borderIndex])
for y in -1...height {
for x in -1...width {
outputImage[x + 1, y + 1] = map[lookupIndex(x: x, y: y)]
}
}
return outputImage
}
func countLitPixels() -> Int {
pixels.lazy.filter { $0 }.count
}
}
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.map { $0 == "#" }
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