114 lines
2.6 KiB
Swift
114 lines
2.6 KiB
Swift
//
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// File.swift
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//
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//
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// Created by Max Nuding on 12.12.21.
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//
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import Foundation
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import Runner
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struct Coord: Hashable {
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var x: Int
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var y: Int
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init(x: Int, y: Int) {
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self.x = x
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self.y = y
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}
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init(line: String) {
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let parts = line.split(separator: ",").map { Int($0)! }
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x = parts.first!
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y = parts.last!
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}
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func foldingUp(by y: Int) -> Coord {
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guard self.y > y else {
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return self
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}
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return Coord(x: x, y: y - (self.y - y))
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}
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func foldingLeft(by x: Int) -> Coord {
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guard self.x > x else {
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return self
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}
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return Coord(x: x - (self.x - x), y: y)
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}
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func folding(by instruction: FoldingInstruction) -> Coord {
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switch instruction {
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case .up(let y):
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return foldingUp(by: y)
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case .left(let x):
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return foldingLeft(by: x)
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}
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}
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}
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enum FoldingInstruction {
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case up(y: Int)
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case left(x: Int)
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init?(line: String) {
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let i = line.split(separator: " ").last!.split(separator: "=")
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let coord = Int(i.last!)!
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switch i.first {
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case "x":
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self = .left(x: coord)
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case "y":
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self = .up(y: coord)
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default:
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return nil
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}
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}
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}
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class Day13: Runnable {
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let inputPath: String
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required init(inputPath: String) {
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self.inputPath = inputPath
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}
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public func run() {
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let input = try! String(contentsOfFile: inputPath)
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let parts = input
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.trimmingCharacters(in: .newlines)
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.components(separatedBy: "\n\n")
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var dots = parts.first!
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.components(separatedBy: .newlines)
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.map(Coord.init)
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let instructions = parts.last!
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.components(separatedBy: .newlines)
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.map { FoldingInstruction(line: $0)! }
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var isFirst = true
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for instruction in instructions {
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dots = dots.map { $0.folding(by: instruction) }
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if isFirst {
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print(Set(dots).count)
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isFirst = false
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}
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}
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printDots(dots: dots)
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}
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func printDots(dots:[Coord]) {
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let maxX = dots.map {$0.x}.max()!
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let maxY = dots.map {$0.y}.max()!
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let uniqueDots = Set(dots)
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var s = ""
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for y in 0...maxY {
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for x in 0...maxX {
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s += uniqueDots.contains(Coord(x: x, y: y)) ? "#" : "."
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}
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s += "\n"
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}
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print(s)
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}
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}
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