aoc2021/Sources/10/10.swift
2021-12-10 07:08:34 +01:00

82 lines
2.2 KiB
Swift

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