171 lines
12 KiB
Swift
171 lines
12 KiB
Swift
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@main
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struct Day10: Puzzle {
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func run() {
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var rest = input[...]
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var score = 0
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var completeionScores: [Int] = []
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loop: while true {
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if let complete = parse(&rest) {
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completeionScores.append(complete)
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}
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switch rest.first {
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case "\n": break
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case ")": score += 3
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case "]": score += 57
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case "}": score += 1197
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case ">": score += 25137
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case let ch?: print("Unknown char", ch)
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case nil: break loop
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}
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rest = rest.drop { !$0.isNewline }.dropFirst()
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}
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print(score)
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completeionScores.sort()
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let completeScore = completeionScores[completeionScores.count / 2]
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print("Part 2:", completeScore)
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}
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func end(for start: Character) -> Character? {
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switch start {
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case "(": return ")"
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case "[": return "]"
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case "{": return "}"
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case "<": return ">"
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default: return nil
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}
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}
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func parse(_ string: inout Substring) -> Int? {
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var stack: [Character] = []
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while true {
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guard let current = string.first else { return nil }
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if current == stack.last {
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stack.removeLast()
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} else if let closing = end(for: current) {
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stack.append(closing)
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} else if current == "\n" {
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return stack.reversed().reduce(0) { partialResult, ch -> Int in
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let characterScore: Int
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switch (ch) {
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case ")": characterScore = 1
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case "]": characterScore = 2
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case "}": characterScore = 3
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case ">": characterScore = 4
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default: fatalError()
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}
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return partialResult * 5 + characterScore
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}
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} else { return nil }
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string = string.dropFirst()
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}
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}
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let input = """
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{<[[<<<[[{[[<<()()>>[([]<>){{}{}}]]]<(<{{}<>}{{}{}}><{<>[]}[{}{}]>)({(())}<[(){}][(){}]>)>}]<<<(<<{}
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{[({({([({(((<[]()>[()<>]){[<>[]](<>[])})<<<[]()}>(<()()>)>)}[{((<{}[]>{<>()}){[<>{}]<<><>>})(({[]()}<<>()>)<
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(((([{{{<{<[[<()<>><<>{}>]]{<(<>())>}>{<[([]<>)<{}{}>][[<><>][<>[]]]>[{(<>{})[<>()]}<<()[]>[[]<
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<<[<([[{{{[({<<>()>}<<<>[]>([]())>){{{{}[]}<(){}>)}]{{[(()())[(){}]]<<[]{}>({}[])>}({<<><>>}<([]<>){()[]}>)}
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<[(({[({<<[[[{<>{}}(<><>))<(<>[])[{}[]]>]<[([][])[(){}]]>]([<[()()](<>[])>]<(<{}()>[{}<>])({<>[
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(<[[{[[[(<((<<{}{}><[]<>>><[{}<>][<>[]]>)<(<{}<>><{}{}>)[{()[]}<<>()>]>)>[(<{({}{})}[{()[]}{[]<>}]>){<(([]
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(([[({{{(<([({[]{}}){{[][]]}])>)[<([[[{}]{(){}}][([]())]]([{[][]}{<>()}](({}()){<>{}})))[{({
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{(<<([([(<<[{((){})([]<>)}]<{{{}{}}{{}[]}}<{(){}}{()[]})>><([<[]{}>([]<>)](<()<>>)){<([]<>
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{[<<[<{{((({<[[]{}]{{}}>{<{}<>>[<>[]]}})<{[(<><>><{}<>>][{[]{}}]}[[[[][]]<<>{}>]{[[]()][[]<>]}]>)[(
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({<(<([{<{<[(((){}){(){}})]>}[{{{{()()}<[]()>}{{<>()}<{}{}>}}[[{{}{}}[<><>]]{({}[]>[[]{}]}]}({{{()()
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{[[{([{<<{<(<<{}()>[()]>)<{{()()}}[<[][]>(<>{})]>>{[<{<>()){()<>}>{{()()}[<>()]}][[[{}[]]]<{{}[]}<()(
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{{<<<<<[[([{<[{}[]]{()<>}>{<<>()>{{}<>}}}<<{{}()}{()()}>{[()<>]({}[])]>]{[(<{}{}>)<({}[])>]<{({}<>)}{({}())
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({(<<{[<<{<(<[<>()][[][]]><[{}<>]({}[])>)[[[<>[]][[]()]]<{[]{}}[{}{}]>]>{[(<[]()>{<>{}})][<{{}}<{
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(<<<[[({<[[(<<[]{}>>[(()<>)[<>{}]])<{(<>[])}(<<>()>[[]{}])>]<[({[]()}{{}{}})<{{}()}<{}<>>>]>][[({<<>()>{[]()}
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{{{[<[([<(<{[([][])[{}[]]]{[()()]{{}()}}}><[<([][])(<>())><{()[]}({}<>)>]<<<(){}><<><>>>((()()){
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[(((([{({<(<(<[]<>>{()[]})><{(<><>){{}[]}}{(()<>)([][])}>)>})}][({{[[{<(<><>){{}()}>((<>()){<>[]
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([{<{<({(<[(<({}<>)><{[]}[{}[]]>)(<[[][]]{[]{}}>{{[]}((){})})]{(((()){{}()})(([][])({}{})))[(<()[]><(
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[([{{<{(<[{{((()())<[]{}>){{{}<>}<<><>>}}[<([]())>[(()[])<{}{}>]]}{[({(){}}{(){}])<<[]()>{{}()}>
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(<[<{{[<<({<<{<><>}><<()[]>[<><>]>>}{[(((){}){()<>}}<<[]()>{(){}}>]{{{{}[]}[{}<>]}[{{}{}}<(){}>]}}){{({
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<([([[<[({<<{{[][]}<{}[]>}<<()[]>[()<>]>>>})((<(<[[]]((){})>{([]()){<><>}})>)(<<<<[]<>>[[]()])>>([[
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[<<{<(<<{{[({<<>()><{}[]>})<{[<>()](<><>)}[{{}()}{[]()}]>]}}({<[{<()<>>}[<<>>]]((<[][]>{[][
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{{(<({[((<([({()<>})[{{}[]}(()<>))]{[{[]<>}][{()<>}]})([({<><>}{{}()})])>)({<(((()<>)(<><>)))>((
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[(<{({[<{<[<([{}()](<>{}))>]([([[]<>]<()<>>){<()>}]{{[[]()]{{}{}}}[{[]}{{}<>}]})>}<([<[<<>[]>]{<(){}>{
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[[[[<(<({<[[<{()}{{}[]}><[<><>]<()[]>>](<([]{})[{}]>)]>}<[{[[{(){}}]{(<><>)}][<<[][]>{(){}
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{(({({[{{((<[([]())((){})]>){[{(<>[])}<([]{})[[]<>]>]({<()<>>[[]<>]}[<()>{<>[]}])})({<([[][]]((){}))([<>{}])
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<(<(<<{[<<{<<[()[]][[]()]><([][])<{}()>>}}>[<<<<{}<>>>{[{}][{}{}]}>[<[()()]{{}[]}>[{[][]}([])]]>[[<<[][]>(
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<<{{({<<(([{{([][])(()<>)}}(<<[]{}>>)])([{[(()[])]}<{{<><>}<[]<>>}[<{}<>><[]<>)]>]{{<[{}[]]
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({[[[[(([[[{<({})([]())>{{<>{}}}}][[<<[]>[<>()]>]{[[[]<>][<>{}]]{[<>[]]}})][[<(<(){}>{()[]})><[[()[
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(((((([{{{(<<(<>{}){<>}><(()[])<()[]>>>{[<{}<>>(<>())}<{{}()}>})((([(){}]{<>})[{[]{}}{{}[]
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(([([(((<[(({[<>()]{[][]}})[{{[]()>[[]{}]}(<<>{}><{}<>>)]){[({[]}(<>[]))([()()][<>{}])]({({}
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[(<({{([[<(((<<>()>[[]<>])({{}()}<()<>>))[[{[]()}<()<>>][{()()}<{}[]>]])>({(<({}{})<()[]}>[{()
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{{{[([<{{{([<<<>{}>{()<>}>{<{}()><<><>>}]([{()}]))<{[<()()>{()[]}]{({}[])[<>()]}}>}}}({<(({({
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[([([<[<(<[{{{<>()}{()[]}}({()[]}[{}<>])}{[{<>}]([[][]]<(){}>)}]>[[{<[<>()][{}()]>(((){}>[<>[]])}{{{<>(
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{{[{{[[<{(<([[[][]]([]<>)])>)<{<<{<>()}[<>()]><((){})<<><>>>>([<<><>>(()<>)]([(){}}{[]<>}))}>}(({{{{[]}{
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[[[[({[<({{[[(<><>)]{<<>[]>([]{})}]<[{[]}{()()}]([<>()]([]<>>)>}})>{{<([{<{}{}>{()}}])({<[<>()](<><>)>
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{[({<[({[{[({[{}()][[]<>]}((()<>)<{}<>>))<[{{}}({}{})]>]{[<<<>[]>[[][]]>(({}[])(()[]))>{(([]{})({}[]))([
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[<<([{{(<<[<[[{}[]]](<[]{}>[<>{}])>[[<{}[]>(<>[])]{([][])[()[]]}]][[{{()[]}[<>{}]}(<<>{}>[[]
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<[(([{([([<{[[(){}]<<>{}>]}[[[()()]{{}<>}]]>[[{({}{})[()()]}([()()][<>[]])]{<[[]<>][[][]]>}]]{{<{[<>
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[<[[[[([[{[[<[{}{}]([]<>)>[({}[])<[]<>>]][<{()()}[<>[]]>([[]]<<><>>)]]}([<{{{}[]}}{(()<>>({}[
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<[<{[(<{({[<[[[][]]([][])]<([]){{}<>}>>[({<>{}}<[]>)]]([[([]{})[[]()]][[[]{}]({}{})]](<[{}<>
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({[<([(<[[<([[(){}]<<>{}>])({[[]{}]<()[]>}<<[]<>>{[][]}>)>{<[<[]()><{}[]>]([<>()]({}[]))><(
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({<<<{<({[[{[{<>{}}[<><>]]}{(({})[()()])<<()<>>([]{})>}]]]{<{{([[]<>](<>[]))[[{}()]({}())]}}>((<([{}<>])>{{<[
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[{([{[[{{<{<[{[]()}<[]{}>]>({<{}[]>{<>[]}})}[(({{}<>}<{}<>]){[[]{}]({}[])})]>}}]({([[([<()()>{[]
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<[{([([{[{<(([<>[]]{<>()})<{{}<>}>){([<><>])<(()[])<<>{}>>}><{{[{}<>]{<>}}[(())[()<>]]}<{[{}{}]{{}{}}}<{{}<>
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[{<<([{{(((<{<<>()>[{}()]}>{<<<>[]><[]()>>}){[(([][])([]()))<{{}[]}[[]()]>][[{{}<>}({}{})]{({}{})(<
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{({[((<([[[{{([])[()()]}({{}{}}))<(<[]<>>[()[]])>]<<([[]<>])<[<>()][[]<>]>>({[<><>]{{}[]}}({()[]
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{[(<(<{[({[(<<[]>{<>{}}>[{<><>}([]())])(<[[][]]<()<>>>[(()[])])]<{[{()[]}[<>{}]]}[{<(){}>(<>{})}<<<>()>>]
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(<{<[<({{{{([({}{})[[]{}]]({{}<>}<()[]}))}(<<{<>()}{()<>}>{[<>{}][()[]]}>{<<[][]>{<>()}><(<>{})<{}[]>>})}
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{(<<{[({<<[(<{{}{}}<[]<>>>((<>())([]<>)))]>><<({<{[]<>}([]<>)>{[()()]}}<<{{}<>}<()()>>(<()()
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<([([<(<[({[[({}()){()<>}](({}{})(<><>))][{({}<>)<{}{}>}{([]){(){}}}]})]>)<[[{<{{(()){<>[]}}({{}()}
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<<<([{[({{{((<{}()>{()()})[[<>()]])[[[{}()]<{}()>]{{[]<>}{{}())}]}<<{<<>><<><>>}[{{}[]}(<><>)
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<([<[<{[[[{[{[<><>][{}<>]}(<[]{}>)]}([{{<>()}<{}[]>}{([]<>)[(){}]}]<{((){})<[]()>}[<[]()><()[]>]>
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[([[[[[({{[(<[{}<>]<{}()>><[<><>]{<>()}>)]}<{(<(()<>)<{}{}>>{{()<>}(()()}})}>})(<[<([<<>[]>((){})]([[]<>]<()
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{(<[[{(((([[([{}()]<{}()))[({}{}){[]}]](<<<>[]>>([<>{}]))][(<({}{})<()[]>><<[]{}><{}[]>>)])(<([([][])[
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({(([{{<{{{<[<<>[]>{()<>}][([][]){()<>}]>([<()>(<><>)]<{<><>}<[]>>)}<{[[<>[]][<>{}]]<{<>()}{[][]
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{[([[[(([<{<{[[]<>]<<>()>}<<()()>([]{})>>[<<()[]>(<>())>[(()<>)]]}>]{{({{{{}[]}({})}<{{}<>}[[]()]>}((
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[<([[<[{{{[[[<<>{}>]{<()[]>{[]<>}}]{([[]{}]({}()))}]}}}(<{<[[({}{})<()()>]]({({}<>)[[]]}{[<><>]{<>{}}})>(<[
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<<(<<{{(({<[<<[]{}>{()()}}[[()[]]]]{[(<>{}){<>}]{[{}](<>)}}><{<(()())<[]<>>>[<(){}>(<>[])]
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{<(<[<[(((<{((()[])([]<>))([[]<>]({}[]))}><<([<>())<[]<>>)(<{}[]>({}<>))>[[([]())]({()()}{{}<>})
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[[((<[[[{{<{<{{}()}[{}()]>{{[]{}}[<><>]}}>}<{[<[(){}]<<><>>]([{}<>]<<><>>)]}(<<[{}<>]<<>{}>
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<[{{[[{<[{(({[(){}]({}{})})[([{}<>][()()])[<[][]><{}<>>]])}](<({(([]<>){()[]})[([]())((){})]}{{{<>{}}<[]()>}<
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<{((<([[{<<[(<{}()><{}[]>)]>[([{<>()}<()()>]<{()[]><()[]>>){<[{}[]]>[{[][]}(<><>)]}]>{{[{{{}<>}{<>}}[[(){}]<(
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{<[({(<{{[([{{[]{}}((){})}[[{}[]]<{}()>]]((<[]<>>)<([]()){{}[]}>))(<<{()[]}{[]})>[[(()())]{[()<>][<>(
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<<{[[[[{<({<[[{}()]]{{[]<>}{[]}}><{{{}()}({}{})}>}{([({}[])({}())](({}[])))[<{[]<>}[<>()]><<[]<>>(<>[])>]}
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[(([<<[{[{<({{()[]}<<><>>})[[([]())[[]{}])(<<>{}>)]>(<{{[][]}[{}()]}([{}{}][(){}])>((<<>[]>(()
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[({<<[[<{[<<({[]()}<()<>>)>]]{{<[[[]][{}<>]]>}{([[<>{}][{}{}]]<((){})(()[])>)}}}([{((<{}[]>)[<{}[]><{}()>])}
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{[[((<[{<<([{<<><>>([]{})}<(<><>)<<>()>>][{[[]{}]{()()}}<({}{})([][])>])><<{({<>{}}[<>()])((
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[[[<{{(<((([{<[]{}>({}<>)}[<<>()>]]<<(()[]){{}[]}>{(()<>){{}<>}}>){{{(()())[<><>]}[[[]<>]{<>[]}]}}))[
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(<({[({[[({{<{<>{}}<()[]>>[{(){}}<<>[]>]}[[<[][]><()<>>]({<>{}}{[]()})]}{(([[]<>][{}[]])(<[]<>>([
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{([<{[<({{{({[[][]][()()])[<<>()><[][]>])}<{{{[]()}[{}()]}{{<>()}{<>}}}((({}())<{}{}>){(<>{})[<>{}]})>}})(((
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([[[[[[{(((((<<>()>[[]<>])<{()()}[()<>]>){<[()[]]<<>[]>>(<<>{}}{{}[]})}))<<[([()()][[]()])[{()[]}([]())]][<([
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({{((((<{<[{[(<>{})][<()()>[[]()]]}]{({(<>())[[]()]}{<[][]><[][]>})}>}>{<<{{(({}())[<>])((()[])<[]<>>)}}[
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<(<[[[<<{([<<[[]<>]{<>[]}><{()()}([]<>)>>]{<{(<>())((){})}{[{}{}]<<>{}>}>})({([[{}{}]])[(<<>()>[
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{[(<{<[[{<{{(<()[]><<>{}>){[()<>]<{}<>>}}[[[<>{}][[]<>]]]}<[[({})<<>[]>]]{{<()<>><<>[]>}<{()[]}((){}
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({[{(<<{[<{({[()()]{{}}}<({}{}){()()}>)}<{(({}{})[<>[]]){([]())[[][]]}}{(<[]<>)[()])[[<>()]]}>>
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(({<<[<[<<<({<{}[]>({}{})}{<{}[]><{}[]>})>>(<<(<()()>{[]{}})({()<>}[()()])>[{[{}()][[]]}({<>()}}]>(
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<<(<(<[{([{<[[<>{}]<{}<>>]>{<(()[])(()())><{<>[]}{()()}>}}([{({}<>){<>{}}}{{<>[]}[{}{}]}]([<[]()>((){})
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{[{([({[[<<<{{[]{}}<[]{}>}[<()[]><[]<>>]>([{{}[]][[][]]]{{(){}}({}[])})>(<{[<>{}](()<>)}>{[<[]()>
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([[[<(<{[({<({()()}{<>()})((<>[])<[]<>>)>}<{<<{}()><<>>>}({{{}[]}}[(()[])[()<>]])>)<[<((()())[<>{}])(
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{<(((<[((((({<[]>[[]{}]}))[(<[[][]][{}{}]>){{[<>()][[]<>]}([()()](<><>))}])){(<[{[<>()][{}()]
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({([{<(((<{[<[{}[]]<<>>>({{}[]}[[]()])]([<(){}>])}{<[{<>[]}{[]<>}][<<><>){<>{}}]>[<((){})([]{})>[[{}{}][()
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<[{[<[{[({{<(({}<>}[[]()])>({{[][]}}<[(){}](()[])>)}})([[{{<<>()>([]{})}[<<>{}>[<><>]]}]])]
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{(<{([{[[({[(<[]{}>)({{}[]}{()()}))<{(()[])}[[()()]{{}[]}]>}<{<(()<>)>{{[]{}}({}())}}({{{}[]}{<
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[<<{<{<<(<([<(<>()){[]()}>[({}<>)({}<>)]][(([]{}){()[]})[{{}()}(()())]])>{([{{()[]}<<>[]>}<{<>[
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{{[[(([([({([([]<>)(()())][{<>()}{(){}}])})])]([{{[<{{{}<>}(<>())>{[()()]<<>[]>}>[{(()){{}[
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[({({({(({{(<[()()][{}<>]>[[{}()]{(){}}])<[<<>[]>][<{}>(<>{})]>}(((({}())({}{}))){{(()[])<[][
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<(<(<[([<[{[<(()<>)<()[]>><(<>())([][])>]{<[{}<>]{{}()}>{[[]{}](<>{})}}}<[<([]{})><{{}<>}([]())>]>]>
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<<<(<<[({{{<{({}<>)<()[]>}<[()<>]{(){}}>><{[[]()]<[]{}>}[({}{})<(){}>]>}(<[<<>[]>{()[]}]>)}[<{[<{}>[{}{
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{(<((<[{{[[[[<{}{}]<{}()>]][{({}{})<<>{}>}[<()[]>(()())]]]{([<[]()><[]{}>](<{}()>))({<<><>>(<>())}{
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{({{[[<[{<{{(<<>>)(<[]()>[()])}([({}<>)])}[[{[()<>][()[]]}]({<[]<>>{<>()}})]><<(<<{}()>{<>[]
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{{{[{[<<{[[{[{{}<>}<[][]>]{(()[])<<>()>}}[<{()()}[(){}]><<()[]>>]]{<((<>{})({}()))[<(){}>([][])]>{({{}[]}<
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<{{[<{({{{[<{{<>()}{{}()}}>]<{<[()[]](<><>)><[<>[]]{(){}}>}<([(){}]<{}{}>){(())}>>}[([{[[]<>][{}<>]}[{()}(
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[<<[{{(({({<{{{}{}}{<>[]}}({[][]}{<>[]})>[{[{}<>][<>[]]}[({}[])[[]<>]]]})}))<(<[[<(({}()))[<<>()>{(
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{<<([<{({[{{[({}[])<<>{}>]([()<>]<(){}>)}<([{}[]]({}{}))>}[<<<<>{}>[[][]]>{<<>[]><()>}>[<<<>><[][]>
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[({(<({[<[{{[<<>[]>[()[]]]<<<>[]>>}}<{([{}[]](<>{}))[{<>}{{}<>}]}(<<[][]>>[{[]<>}])>]>[(<(({<>[]}{<><>}))(<
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{<[[{{<<{(<(<([]<>)[[][]]>[([]{})[<>{}]])<[{<>()}{[]<>}]>>>[{(({()()}[<>[]]){({}())<[]<>>})}[(<{<>
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{[[{{{<[<[{<(({}{})[{}()])[(<><>)({}())]>}{[<{[]{}}[()[]]>]<{[()()]<[]()>}<[[][]]>>}]>{{({{{()[]}{{}(
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<{[<([{{[[<(<{<><>}[{}{}]><((){})>){[[()()][()[]]]{[[]<>]}}>]<<(<({}[])<{}[]>>{(<><>)<[]()>}){(<
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"""
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}
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