102 lines
2.6 KiB
Swift
102 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 17.12.21.
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//
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import Foundation
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import Runner
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import Collections
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struct Point:Hashable {
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var x: Int
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var y: Int
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}
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struct Area {
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let topLeft: Point
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let botRight: Point
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init(x: String, y: String) {
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let xVals = x[x.index(x.startIndex, offsetBy: 2)...].components(separatedBy: "..").map { Int($0)! }
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let yVals = y[y.index(y.startIndex, offsetBy: 2)...].components(separatedBy: "..").map { Int($0)! }
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topLeft = Point(x: xVals.first!, y: yVals.last!)
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botRight = Point(x: xVals.last!, y: yVals.first!)
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}
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func contains(point: Point) -> Bool {
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point.x >= topLeft.x && point.x <= botRight.x && point.y <= topLeft.y && point.y >= botRight.y
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}
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func overshot(point: Point) -> Bool {
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point.x > botRight.x || point.y < botRight.y
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}
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}
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struct Probe {
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var position = Point(x: 0, y: 0)
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var velocity: Point
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mutating func move() {
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position.x += velocity.x
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position.y += velocity.y
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var dX: Int
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switch velocity.x {
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case _ where velocity.x < 0:
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dX = 1
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case 0:
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dX = 0
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case _ where velocity.x > 0:
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dX = -1
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default:
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fatalError()
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}
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velocity.x += dX
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velocity.y -= 1
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}
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}
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class Day17: 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: ": ")
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.last!
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.components(separatedBy: ", ")
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let area = Area(x: parts.first!, y: parts.last!)
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var maxY = Int.min
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var found = Set<Point>()
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for x in 0...500 {
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for y in -500...500 {
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let velocity = Point(x: x, y: y)
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var probe = Probe(velocity: velocity)
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var maxYCurrent = Int.min
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repeat {
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probe.move()
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if probe.position.y > maxYCurrent {
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maxYCurrent = probe.position.y
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}
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if area.contains(point: probe.position) {
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if maxYCurrent > maxY {
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maxY = maxYCurrent
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}
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found.insert(velocity)
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break
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}
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} while !area.overshot(point: probe.position)
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}
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}
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print(maxY)
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print(found.count)
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}
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}
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