day10

2 files changed, 206 insertions, 0 deletions

diff --git a/inputs/day10 b/inputs/day10
new file mode 100644
index 0000000..ae1deb5
--- /dev/null
+++ b/inputs/day10
@@ -0,0 +1,98 @@
+[[{[<{{<<{<[<{<>[]}([][])>{{<>()}<()>}](({{}<>}[[]<>])<([]<>){[]()}>)>[<{{<>}<[]()>}[{[][]}<{}{}>]><{<
+{[<[({([[(<<(([]{}))<[{}()]>>>)]])<([<{[{({}{})[[]()]}[(()[])<{}()]]]{{[[][]]<<>[]>}}}{([([
+{<{<{(({[[([{<<><>>([]())}[{()[]}({}())]}<{{{}}{[]<>}}({<>{}})>){<(([]())([]<>))(<<>[]><[]<>>)>({[[]
+{[([<{<([{{(({()<>}({}<>)))(<{<>{}}](<<>[]><()()>))}{[{{[]()}(<>[])}{{[][]}{<>{}}}]}}{[{{{{}[]}<<>()>}}<{([]
+[({[{[(<<<[((<{}<>><{}{}>)({[]<>}((){}))){{[{}<>]{{}<>}}})[<[<<>>[<>{}]]{{<>[]}}>]>>[[([<{<><>}
+<[{[{[[<{[[{<<[]()>[{}<>]>}]<([{{}}({}{})])>]{<[[<<><>><()[]>]([[]<>]{[]<>})]{(([][]){()[]})
+((<(<(<[(<([(<{}<>>(()()))](<{{}[]}{()[]}>))<<<(<>[]){()()}>([<>{}]{{}})>({{[][]}(()())}(<
+{{([(<{<([([[[<><>][()<>]]{(()[])}])]({<[<<>>[()<>]]({()[]}[{}()])>]))>({<<[<{[]()}<<>[]>>{<[]
+([<{{((<({<[<({}<>)[[]()]>]([(<>)<(){}>](([][]){{}{}}))>{(({<>[]}<()()>){(()[])})[{{[][]}((){})}[([]<>)({}{})
+<<<{<{<([<[((<()<>]<[]()>)[(<>[])[{}<>]])]><[<[(()())[()()]]{[{}{}][()()]}>]{<<(<>())[<>[]]>>[<(()())<[]
+{<[[({<[{[{[({{}<>}<<>{}>){<{}[]><{}{}>}]{{<<>>}<(<>()){()<>}>}}]}{{<[({{}()})([()<>]{[]})
+(((([[(((<(<<(<>())[(){}]>([[][]]{()()})>{<[<>[]][()<>]>(([]{})[<>{}])})[({{()<>}({}())})]>([[[(()<>)][[<>()
+[<({([[[<<([<<<>()>>{[<>()](<>{})}]){<[[{}<>]]<{{}<>}([]{})>>}>[<<<{{}()}>>[[([][])<<><>>]({<>
+{<(<<{{<<[({{({}<>)[[][]]}(<()[]>[<>])}<{<()>{{}()}}>){{<[(){}][(){}>><{{}<>}[[]{}]>}}]<{<{
+{(<{<[<(<<(<[([][])<[]{}>]><{([]())(<>{})}{<(){}><[][]>}>><({({}[]){<>()}}{<{}>(())})>>{({{(<><>)[{}()]}
+[(<{[<<[{((({[{}<>][[]<>]}){(<{}<>>({}<>))<(<><>)[<>]>})<({{<>[]}}}>)}]>([{{<<{{[][]}(<>())}<{{}
+<<<[[{[<<{[{<(()[])<[]()>>}[(({}[]))(({}<>){<>})]](([{(){}}[<>]]<[{}{}]<{}<>>>))}>{{[(((()[]){(){}})(<(){}>{
+[{{<<([[[[<<[{(){}}{(){}}]{<{}()>(()())}>{{<{}()>}<[<><>][()()]>)>([{{()<>}<()[]>}[[<><>]{[]<>}]]{[{
+<[[{[{<[(({({[<>{}]}([<>[]]))<<[<><>]([]<>)>([{}()][()()))>}[((<{}>{[]{}}))[[{{}}[<><>]]]])(([{{[]()}<[]
+{{{<{([[[<[<{{(){}}({}{})}>[[{()[]}<[]{}>]<<()<>>[()[]]>]}<{[[[]()]<<><>>]({<><>}<[][]>)}{(<[]()><{}<>>)}>>
+([<<[(([{{[([{<>{}}])<[(()){<>{}}]>](<{([][])[<>()]}<{{}()}>>)}>{[{{(<()()>[<><>])((<><>){()()})}{([[][]])[[{
+[{((({<([{(<{(<>)[[]()]}({{}<>}<[]<>>)>)}(<<[({}{})]{({}<>)[<>()]}>>[<[[()<>]{<>()}][<[][]><<>{}>]>[<([][])[(
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+({{<([{<<<<<{{()}({}())}<[()]{[]{}}>>[([()<>]([][]))<{()<>}>]>>>>}<{[[[<<<<>()>{[]{}}>[({}()){(){}}]
+<[{([<<(<(<[(({}()){[][]})[[(){}][[]()]]][<[{}]([][])>]>}>(<{[({[]<>}{(){}})<(<>)({}())>]<[({}<>)<{
+(({[{<({<<[<{{[]<>}[<><>]}{{{}}<()[]>}>]<<<{()()}{{}<>}>([[]()][<>()])>>><[([(<><>)<()[]>]
+{([<<[{[(({[{{()<>}({}{})}<[{}[]]<(){}>>]<{<[]<>>}<[()()][()()]>>}<<[[(){}](<><>)]><(<{}[]>
+{([<{<([(<(<(<[]{}>{<>()}){{<>{}}}>({<[][]>(<>{})}))<[<[{}{}]<{}{}>>{(<>[])(<>())}][<{{}<>}(()[]
+[{[(<(({{(<{(<[][]>){[<>{}]}}{<{(){}}{<><>}>({[]{}}{[]{}})}>)(<[(([]<>))[[[]()]<[]<>>]]<{({}[])<{}<>>}[
+[{<{({((<{[{[<<>{}>[[]]]{<{}()>[<>]}>]}>[{([(<[][]>{[]()}){<(){}>[<>[]]}][[([]<>)<[]{}>]{{{}}[{}]}])([
+{<(<({[{[(({((<>[])<{}{}>)({[]<>>[{}[]])}([{(){}}([])]{<<>[]>[{}()]}))[[<[<><>]<<><>>>{[()()]<
+{{{<[<<{(<(([({}<>)<()>]{<()()><[]<>>})(<[()[]]{[]{}}>{{{}{}}(<>())}))({([[]()]{()[]}){{{}<>}[
+(<({{[{<{[<[[{[]()}]([[]()][<>{}])][[[<>]{<>}]<([]{})<{}[]>>]>{[{{<><>}[[][]]}<{[]{}}({}())>](<[[]()]({
+<<[{[<{<[[(<[<(){}>(<>)](<[]<>>[[]()])>{<<{}[]><{}()>>[(()[])(<>{})]})({({{}<>}[<>{}])}{({[][]}<<><>>)})]({<[
+[[([<{{(<({[{([][])(()<>)}]{{{[]<>}[()()]}[({}{})[()[]]]}}>><[[{{[()()]({}())}}({(()[])[[]()]}{
+<<{(<(([{((<([()()]){{[]<>}{{}()}}>)<<<({}<>)[<>{}]><({}[])<[]<>>>>(<[[]]{(){}}>(([][])([])))>)[{[{([]<>)[<>{
+[(<(<<{{[([[[({}{})<()())]({[]}{{}[]})]({[()()]([]{})}{({}[])[[]()]})]<[[{<><>}<[][]>][[[]()]{(){}}]]>){(([<(
+[[<[<{<[{({{{{<>{}}<[]()>}<<(){}>>}<{{{}{}}{()<>}}[([]{}){<>{}})>})[[((<<><>>[{}[]])<{()<>}<()
+((<(<<[[{{{(<<{}()>[()()]><((){})>)[[[[][]][()[]]][{[]<>}<{}{}>]])((([[]{}]<[]{}>))([{<>{}}(<
+{{(({[{[({({<<<>[]><<>[]>>{{()[]}[{}()]}})[{(<{}<>><[]>)(({}[]){{}[]})}<<<[]()><[]{}>><{<><>}<()<>>>>]})
+[(<[{[<({{[{<[<>()]([]{})><{(){})[()[]]>}<(<()()>(()()))(<{}[]>({}[]))>]([([[]()]({}{}))({(){}}([](
+{({(({[<{<[<<{<><>}(<>[])>[<{}{}><[]<>>]><<{<>}>>](<<<()<>>(()<>)>{<{}[]>([]<>)>>)>}<{<{{<<
+<([[[(({[{<(({<>[]}<<>[]>){<{}[]>([]()))){<({}<>)<[][]>>{<{}{}>{()[]}}}>{((({}{})[{}[]]))({[<><>]}<<<>{}
+[{[[[{<<(({[({[][]}<[]<>>)<{{}()}{{}}>]{({[]}[<>{}]){<[][]>[{}{}]}}})[[([<<>()>(<>[])]<<<>
+<({<<[(({[([{[()[]]({}{})}{{()[]}[()[]]}])[([((){}){<><>}]{<()[]>{{}{}}})]][[{<[()()]({}<>
+[{<([<({{<<[((<>[])(<><>))((()[])([][]))][(([][])<<>()>)]>[<<{()<>}<{}<>>><<{}<>>{()<>}]><{[()[
+[<{[<([{((({<<[]{}><{}{}>>([{}<>]<<><>>)})[[(<{}<>>([]<>))<<{}()>{{}<>}>]{[<[]<>>][[{}<>]<{}[
+({<{<[<({([<{<()()>{{}[]}}({<>{}})><{[[]<>]<[]()>}<[{}()]{{}[]}>>])}([<<[{[]<>}<<><>>][<[]{
+{[({<[[<<<(<{<{}<>>(()())}[{()}{()<>}]>)[<{{(){}}(()<>)}>{[([]{})(()<>)]{[(){}]{()[]}}}]>{{[<<[]()><()<>>>{
+<[{{({({(<<{[(()<>){[]()}][<[]>(()())]}{<(<><>}{()[]}>}>(<<{{}()}<[][]>>[{()<>}{{}{}}]>)>)}<[(<((<(
+[<{[<[{[[[([<(<>{}){{}<>}>(<<>{}>{{}{}})]{({<>[]}<{}()>)<({}<>)<{}{}>>}){<[[[]{}]{{}{}}]<<[]<>>(()[])>
+{[{((<(<[(((<({}[]){[]()}>)))]([{<(<<>{}>[[]])<[[][]][(){}]>>[{[{}<>]{[]<>}}{(<>())(())}]}[{<{{}()}<<>[]>>}[[
+[[[{{(<<<<((<((){}){[]<>}><<(){}><()<>>>){[<[][]>({}[])](({}{})<[][]>)})[[{(<>>}([{}()][{}()])]]>>>((<{[
+[[({<[[<([<[((<>{})({}<>))({{}{}}(()[]))]<<((){})<()()>>[<[][]><{}{}>]>>({[<()()>[[][]]]})])>
+([<(<{(<<[<{{([]<>)[<>[]]}<<()()>[(){}]>}><([[<>[]]](({}[])))({(()())<(){}>}<[<>>[()()]>)>]>>)
+{(({([{[{(<[[((){})(<>{})]<(()())(()[]>>]{([{}]{[][]})}>)<((((()<>)[<><>])<((){})[()()]>)[[<()<>>][<{}
+{{([{{<<({{<<<[]()><()[]>}{{()<>}}>[<{()<>}<[]{}>><{{}[]}[{}[]]>]}})({{({[<>{}]<(){}>}(<<>>(()<>)))(<
+<[[{<(<{{<[<{({}())}({[][]}{<><>})>{[<<>{}><()[]>]<[<>[]]<<>[]]>}]>(({[{[]()}<[]<>>]{<<>><<>[]>}}))}([[<
+([{<[{<({{[((<{}<>>[(){}])({()<>})){{<<>{}>}[<{}()>{()[]}]}]}[{(({()[]}(<><>))[<{}()>(<>[])])<[{()[]}[
+{<[{({<((<({[{[][]}{{}[]}]{[<>()][<>{}]}}((({}())([]()))<([][])[[][]]>)}({[[[][]]({}())]}{({{}}){(<>[])
+{{[{{({(<(<[[[[]{}](<><>)]([[]{}]{<>[]})]>({{{()[]}([])}[{[][]}(<><>)]](({[]}<<>[]>))))>)}({{[{{(([])
+[<[{[{<<({{[{[<>{}]<(){}>}]}<{(({}()){{}<>})(<{}()>{[]<>})}{<[[]{}]>}>}[<[[([][])[[]]]]{{([]())[{}<>]}<({
+([<({{[((<({(([]<>){[]<>))[({}())([]<>)]})[{{{{}<>}{{}[]}}}<<([]{})({}[])>[<()[]>]>]><([[[{}<>]<()>]([<>{}
+<[<{[[[<{{[[([[]<>]{(){}))[[{}<>][[][]]]](([<>[]]<<>[]>)[(()<>){()<>}])]}[<<((())(<>{}))<{[]()}<[
+[{[[{[[(<<(<({{}[])[<>()])><[[[]()](<>())]<{[]<>}({}())>>){[<{<>{}}[[]<>]>]}>{{<[<<>()>[()[]]
+[(([{(([{<[<[<{}[]>[<><>]]>({[{}{}]{[]{}}})]>}{{[[<[{}{})<()()>>{{<>}{{}[]}}]{{([][])[<>{}]}{
+(((<<<<[(<[<{{()()}<[]{}>}<{[][]}{<>[]}>>[[[()()]{{}{}}]]]({[<()()><[]{}>]{{[]{}}([]())}}<{<()<>>[<>]}<<{}
+<([<[[<<[(({(({}())<{}>)<(()[])[{}[]]>})<<({{}}[[]{}])[({}{})((){})]><<{{}()}{[][]}>>>)]>[[(
+<<<{(<{{(([{<{()[]}><<[]{}>{{}[]}>}{(<[][]>[[]<>])[{()<>}]}](<[[<><>][<>[]]]([()[]]<{}()>)>))<(
+{[[([<<[[(<((<()()>(<><>))[[{}()]<()<>>]){[((){}){[]{}}][[{}[]]]}>([<((){}){(){}}>[([]{}){()[]}]]))]<[<<{<<><
+([{[{([<{{{[<(()[])({}())>{[<>{}]{{}<>}}]{(([]<>){<>}){[()<>]<()[]>}}}(<<[{}<>](()[])>{[[]()]
+[<((<<<[{[((([<>{}]){[(){}]})<<{<>{}}({}[])>[[[]{}]<()[]>]>){<(<<>()>(<>[]))[(()[]){[]<>}]>
+<(([({[[[[<<[[[]()]]<<()[]>>>>{{<[()[]]{{}{}}>{<[]()>{()[]}}}<[({}<>)[()<>]]>}]([([[()()]<<>{}>])<{<{
+<{([([((<{{[([()[]]{{}()})][(<<><>>){{{}[]}[[]<>]}]}}>[((<(<<>>[[]<>])[(()[]){()<>]]><<{{}
+{<[[({{<<[<<<{()[]}<<>{}>>([[]<>]((){}))>[{[<>()]{{}<>}}[({}())]]>{[{{[]()}({}())>]({{(){}}<()<>>}{<(){}>{
+{(<[{[{{[<(<({(){}}<[]()>)(<<>[]>{<>{}})>)>]({[{[({}()){<><>}]<[[]<>]{<>{}}>}(<<{}{}>([]<>)>(({}{}){(
+((<((((<<({[{{{}[]}(()())}{<()()>}]<[[<>[]][(){}]][{()[]}]>}(([<[][]>][<[]()>({}[])])[<<[]()>[{}<>
+[[{<[(<{{<{<[{<>()}[[]]]({{}<>})>{{{()[]}<{}<>>}}}<({{()[]}}[[<>()](()[])])<[([]<>)[{}<>]][([][]
+<{{[{[{(<<({{{{}[]}{[]<>}}<[[]{}]{{}[]}>}[({{}{}}<[]()>){[[]<>]}])((<{()()}[[]{}]>({()<>}<
+({{{<({{<<[<[{()<>}[[]<>]]<[{}{}][<>[]]>>({[{}()]<<>>}[(<><>)({}())])][([{<>()}{<>{}}]{(<>()){()[]
+[((<({(<<({[<(<>{})<[]<>>>[([])[(){}]]][{{()<>}(<><>)]<[{}{}][{}<>]>]}{<{(<><>)[{}[]]}(([])[[]{
+(([{<[<{<<{{({()[]}{<>{}})[[[]<>]<[][]>]}<{<()<>>[()()]}{<<>><()<>>}>}>>[<[[<[{}<>]{[]{}}><(<
+(<<<[<<<(([{{<()<>>[<>[]]}{<()[]>([][])}}])(([{{{}{}}[<>()]}({<>()}{[]{}})]<[<<>[]>]{({}<>){[]<>}
+{<<[<([[({({{<{}[]>([]{})}[<()<>>[(){}]]}{[(()<>)]{<()[]>({}[])}}){<([{}[]]({}<>))(({}{})(()<>))><([(){}]<{}
+{{[[<(<({<([[{[]{}}(()[])]<(<>[])>])({[[{}[]]({}<>)]})>[(<<[{}{}]<[]<>>>>{{{[]<>}[{}()]}({<><>}<<>()])}){([<
+{[[{{<(({(([[<()>{()<>}]([[]()]([][]))]<<({}[]){[][]}>([<><>]{()()})>)((<[<><>]{[]<>}>[[[][])[[]<>]
+[[<<{[[{([<{({[]()}({}())){{{}<>}<()()>}}([{{}()}<{}()>][{<>}[()<>]])><{{{{}[]}(<><>)}{[[]<>]<[]<>>}}>])}
+({(({(<({[{((<{}><{}>){<{}()>[{}[]]})}]{[<({<><>}({}()))>{{({}<>)(()<>)}{<{}{}>{<>[]}}}]}}({[{([[]{}])[<()
+({[{<<[<<[{{{{[][]}[()[]]}<<{}()>{{}()}>}{({<><>}([]))[<{}<>>(<>{})]}}{[([<>{}][()<>])([()[]])]}]<{[(<<><>
+{<{<(({[[{(({{()<>}[[]<>]}[[()<>][()()]])(<((){})[<><>]>{[[]<>][()<>}}))}<[<{{{}}[{}[]]}<(
+{{<[[(<[{<<((<{}<>>{(){}}))((<[]<>><{}{}>)({<>()}<()<>>))>>({[{(()[])<{}<>}}(<()()>)][<[<>{}]{<>
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+(<([{[[[[[(<(<<>{}>)<{{}{}}>>(<<[]()><[]()>>(<(){}]{()()})))]]]({(<{(<()>([]{}))[{()<>}{[][]}]}([<
+(([({{{<(<{[<[<>[]](<>())>(<{}{}>)]<(([]<>>(()[]))(<()()>(<>{}))>}>({{[{[][]}][{[]<>}([]{})]}(<(()
+({({<{[{{([(<(()())><{[]{}}(<>())>)(<[()()]{()()}>[[[]()](<><>)])]{<<[[]<>](<>())>(({}{})<<><>>)>
+((([[{[<[{(<[{<><>}{{}<>})>{<[<>{}](<>)>[<[][]><[]{}>]}){[{{()[]}<<><>>}<(<><>)({}{})>]{<{(
+[[<({([{{[<{<(()())<[]<>>>{[[]{}]}}(<[{}<>]<<>()>><(()<>)[()()]>)>>{<{<[[]<>]{[]()}>{<[]<>>{[
+(({[[(([[<{([[{}<>]{()()}][[{}[]]{[]{}}]){[[()[]]<[][]>][<{}{}><{}{}>]}}[{[({}())[[]<>]]}{[({})<<>>]<{<>[]}
diff --git a/src/bin/day10.rs b/src/bin/day10.rs
new file mode 100644
index 0000000..dad43fc
--- /dev/null
+++ b/src/bin/day10.rs
@@ -0,0 +1,108 @@
+use std::collections::VecDeque;
+use std::collections::HashMap;
+
+fn main() {
+    let input = advent::read_lines(10);
+    println!("10a: {}", syntax_error_score(&input));
+    println!("10b: {}", completion_error_score(&input));
+}
+
+enum ParsingError {
+    Corrupt { illegal: char },
+    Incomplete { missing: VecDeque<char> },
+}
+
+fn parse_line(line: &str) -> Result<(), ParsingError> {
+    let mut openings = VecDeque::new();
+    let chunks = HashMap::from([
+        ('(', ')'),
+        ('[', ']'),
+        ('{', '}'),
+        ('<', '>'),
+    ]);
+
+    for c in line.chars() {
+        if chunks.contains_key(&c) {
+            openings.push_front(c);
+        } else {
+            if openings.is_empty() {
+                return Err(ParsingError::Corrupt { illegal: c });
+            }
+            let expected = *chunks.get(openings.front().unwrap()).unwrap();
+            if expected != c {
+                return Err(ParsingError::Corrupt { illegal: c });
+            } else {
+                openings.pop_front();
+            }
+        }
+    }
+
+    if !openings.is_empty() {
+        Err(ParsingError::Incomplete { missing: openings })
+    } else {
+        Ok(())
+    }
+}
+
+fn syntax_error_score<T: AsRef<str>>(input: &[T]) -> usize {
+    let scores_corrupt = HashMap::from([
+        (')', 3),
+        (']', 57),
+        ('}', 1197),
+        ('>', 25137),
+    ]);
+
+    let mut score = 0;
+    for line in input {
+        if let Err(ParsingError::Corrupt { illegal }) = parse_line(line.as_ref()) {
+            score += scores_corrupt.get(&illegal).unwrap();
+        }
+    }
+    score
+}
+
+fn completion_error_score<T: AsRef<str>>(input: &[T]) -> usize {
+    let scores_incomplete = HashMap::from([
+        ('(', 1),
+        ('[', 2),
+        ('{', 3),
+        ('<', 4),
+    ]);
+
+    let mut scores = Vec::new();
+    for line in input {
+        if let Err(ParsingError::Incomplete { missing }) = parse_line(line.as_ref()) {
+            let mut score = 0;
+            for c in missing {
+                score *= 5;
+                score += scores_incomplete.get(&c).unwrap();
+            }
+            scores.push(score);
+        }
+    }
+    scores.sort_unstable();
+    scores[scores.len()/2]
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test() {
+        let input = [
+            "[({(<(())[]>[[{[]{<()<>>",
+            "[(()[<>])]({[<{<<[]>>(",
+            "{([(<{}[<>[]}>{[]{[(<()>",
+            "(((({<>}<{<{<>}{[]{[]{}",
+            "[[<[([]))<([[{}[[()]]]",
+            "[{[{({}]{}}([{[{{{}}([]",
+            "{<[[]]>}<{[{[{[]{()[[[]",
+            "[<(<(<(<{}))><([]([]()",
+            "<{([([[(<>()){}]>(<<{{",
+            "<{([{{}}[<[[[<>{}]]]>[]]",
+        ];
+        assert_eq!(syntax_error_score(&input), 26397);
+        assert_eq!(completion_error_score(&input), 288957);
+    }
+}