82 lines
2.2 KiB
Swift
82 lines
2.2 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 05.12.21.
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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 Day10: Runnable {
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let inputPath: String
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public func run() {
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let input = try! String(contentsOfFile: inputPath)
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let lines = input
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.trimmingCharacters(in: .newlines)
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.components(separatedBy: .newlines)
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//.map { line in line.map { $0.wholeNumberValue! } }
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var s = Deque<String.Element>()
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var illegalCharacters = [String.Element]()
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for (lineNumber, line) in lines.enumerated() {
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for char in line {
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if char.isClosing {
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if let popped = s.popFirst() {
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if let shouldBeClosedBy = popped.closedBy {
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if shouldBeClosedBy == char {
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continue // Valid chunk
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}
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print("Line: \(lineNumber): Expected \(shouldBeClosedBy), but found \(char) instead")
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illegalCharacters.append(char)
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break
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} else {
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print("\(popped) should be an opening character, but cannot find a fitting closing char. Line: \(lineNumber+1), char: \(char)")
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}
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} else {
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print("Found closing character \(char), but empty list!")
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}
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}
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s.prepend(char)
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}
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}
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print(illegalCharacters.map{$0.score!}.reduce(0,+))
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}
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}
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extension String.Element {
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var isClosing: Bool { self == "]" || self == ")" || self == ">" || self == "}" }
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var closedBy: String.Element? {
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switch self {
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case "[":
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return "]"
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case "(":
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return ")"
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case "{":
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return "}"
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case "<":
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return ">"
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default:
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return nil
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}
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}
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var score: Int? {
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switch self {
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case ")":
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return 3
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case "]":
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return 57
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case "}":
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return 1197
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case ">":
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return 25137
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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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