110 lines
3.1 KiB
Swift
110 lines
3.1 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 11.12.21.
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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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let row: Int
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let col: Int
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var left: Coord { Coord(row: row, col: col - 1) }
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var right: Coord { Coord(row: row, col: col + 1) }
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var top: Coord { Coord(row: row - 1, col: col) }
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var bottom: Coord { Coord(row: row + 1, col: col) }
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var topLeft: Coord { Coord(row: row - 1, col: col - 1) }
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var topRight: Coord { Coord(row: row - 1, col: col + 1) }
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var bottomLeft: Coord { Coord(row: row + 1, col: col - 1) }
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var bottomRight: Coord { Coord(row: row + 1, col: col + 1) }
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var neighbors: [Coord] {
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[topLeft, top, topRight, left, right, bottomLeft, bottom, bottomRight]
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.filter {coord in coord.col >= 0 && coord.col < 10 && coord.row >= 0 && coord.row < 10}
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}
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}
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class Day11: Runnable {
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let inputPath: String
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var octopuses = [[Int]]()
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var flashed = Set<Coord>()
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let numRows = 10
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let numCols = 10
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var numFlashes = 0
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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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octopuses = input
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.trimmingCharacters(in: .newlines)
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.components(separatedBy: .newlines)
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.map { Array($0) }
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.map { ar in ar.map {c in Int(c.description)!} }
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var step = 0
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while(flashed.count < numRows * numCols) {
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flashed = Set<Coord>()
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for row in octopuses.indices {
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for col in octopuses[row].indices {
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octopuses[row][col] += 1
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}
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}
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for row in octopuses.indices {
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for col in octopuses[row].indices {
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let coord = Coord(row: row, col: col)
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checkAndFlash(at: coord)
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}
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}
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for flash in flashed {
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octopuses[flash] = 0
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}
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step += 1
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if step == 100 {
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print(numFlashes)
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}
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}
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print("All flashing at step: \(step)")
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}
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func checkAndFlash(at coord: Coord) {
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if octopuses[coord] <= 9 || flashed.contains(coord) {
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return
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}
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flashed.insert(coord)
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numFlashes += 1
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for neighbor in coord.neighbors.filter({!flashed.contains($0)}) {
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octopuses[neighbor] += 1
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checkAndFlash(at: neighbor)
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}
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}
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}
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extension Array where Element == Array<Int> {
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subscript(coord: Coord) -> Int {
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get { self[coord.row][coord.col] }
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set(newValue) {
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self[coord.row][coord.col] = newValue
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}
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}
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func fieldDescription(flashed: Set<Coord>) -> String {
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var desc = ""
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for row in indices {
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for col in self[row].indices {
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let c = flashed.contains(Coord(row: row, col: col)) ? " X" : String(format: "%02d", self[row][col])
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desc.append("\(c),")
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}
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desc.append("\n")
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}
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return desc
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}
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}
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