Solve 2021/10

2021/day10/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day10"
+version = "0.1.0"

2021/day10/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day10"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

2021/day10/README.md

@@ -0,0 +1,88 @@
+https://adventofcode.com/2021/day/10
+
+## \--- Day 10: Syntax Scoring ---
+
+You ask the submarine to determine the best route out of the deep-sea cave,
+but it only replies:
+
+[code]
+
+    Syntax error in navigation subsystem on line: all of them
+[/code]
+
+_All of them?!_ The damage is worse than you thought. You bring up a copy of
+the navigation subsystem (your puzzle input).
+
+The navigation subsystem syntax is made of several lines containing _chunks_.
+There are one or more chunks on each line, and chunks contain zero or more
+other chunks. Adjacent chunks are not separated by any delimiter; if one chunk
+stops, the next chunk (if any) can immediately start. Every chunk must _open_
+and _close_ with one of four legal pairs of matching characters:
+
+  * If a chunk opens with `(`, it must close with `)`.
+  * If a chunk opens with `[`, it must close with `]`.
+  * If a chunk opens with `{`, it must close with `}`.
+  * If a chunk opens with `<`, it must close with `>`.
+
+So, `()` is a legal chunk that contains no other chunks, as is `[]`. More
+complex but valid chunks include `([])`, `{()()()}`, `<([{}])>`,
+`[<>({}){}[([])<>]]`, and even `(((((((((())))))))))`.
+
+Some lines are _incomplete_ , but others are _corrupted_. Find and discard the
+corrupted lines first.
+
+A corrupted line is one where a chunk _closes with the wrong character_ \-
+that is, where the characters it opens and closes with do not form one of the
+four legal pairs listed above.
+
+Examples of corrupted chunks include `(]`, `{()()()>`, `(((()))}`, and
+`<([]){()}[{}])`. Such a chunk can appear anywhere within a line, and its
+presence causes the whole line to be considered corrupted.
+
+For example, consider the following navigation subsystem:
+
+[code]
+
+    [({(<(())[]>[[{[]{<()<>>
+    [(()[<>])]({[<{<<[]>>(
+    {([(<{}[<>[]}>{[]{[(<()>
+    (((({<>}<{<{<>}{[]{[]{}
+    [[<[([]))<([[{}[[()]]]
+    [{[{({}]{}}([{[{{{}}([]
+    {<[[]]>}<{[{[{[]{()[[[]
+    [<(<(<(<{}))><([]([]()
+    <{([([[(<>()){}]>(<<{{
+    <{([{{}}[<[[[<>{}]]]>[]]
+    
+[/code]
+
+Some of the lines aren't corrupted, just incomplete; you can ignore these
+lines for now. The remaining five lines are corrupted:
+
+  * `{([(<{}[<>[]}>{[]{[(<()>` \- Expected `]`, but found `}` instead.
+  * `[[<[([]))<([[{}[[()]]]` \- Expected `]`, but found `)` instead.
+  * `[{[{({}]{}}([{[{{{}}([]` \- Expected `)`, but found `]` instead.
+  * `[<(<(<(<{}))><([]([]()` \- Expected `>`, but found `)` instead.
+  * `<{([([[(<>()){}]>(<<{{` \- Expected `]`, but found `>` instead.
+
+Stop at the first incorrect closing character on each corrupted line.
+
+Did you know that syntax checkers actually have contests to see who can get
+the high score for syntax errors in a file? It's true! To calculate the syntax
+error score for a line, take the _first illegal character_ on the line and
+look it up in the following table:
+
+  * `)`: `3` points.
+  * `]`: `57` points.
+  * `}`: `1197` points.
+  * `>`: `25137` points.
+
+In the above example, an illegal `)` was found twice (`2*3 = _6_` points), an
+illegal `]` was found once (` _57_` points), an illegal `}` was found once (`
+_1197_` points), and an illegal `>` was found once (` _25137_` points). So,
+the total syntax error score for this file is `6+57+1197+25137 = _26397_`
+points!
+
+Find the first illegal character in each corrupted line of the navigation
+subsystem. _What is the total syntax error score for those errors?_
+

2021/day10/input/example0

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+Syntax error in navigation subsystem on line: all of them

2021/day10/input/example1

@@ -0,0 +1,10 @@
+[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]

2021/day10/input/input

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+([({<(({<[(<([{}<>])<(()<>){<>[]}>>[[{<>{}}[<>{}]][(<>[])<{}<>>]]){[{{[][]}[[]{}]}({{}[]}[{}<>])]({({}{})
+([{{[(<{[{{<[{{}[]}{(){}}]{[{}{})([]())}>}(({{{}}{<>{}}}{(()[])(()<>)}){<<{}()><[][]>>})}(<<<(<
+((<[[<([[({{[([]{})([][])]{({}())(()}}}({[[][]](()<>)}(<[]{}>[[]{}]))}<[[{()<>}<[][]>]]{{{
+{{[{{<[{[[(<((<>())(<><>))<<()[]>>>)<<<(<><>)[()()]><([])<[]>>>{{({}()){[][]}}<[[]]>}>]]<[
+[<{(<{<<[[[[(<{}()>{{}()})[[()()]<{}()>]]{{<<><>>({}<>)}(([]{})[{}<>]}}]{{({[]<>}{[][]})<[<>[]]<{}()>>}[{
+<<{<{<<{<<[(([<>()][<>{}])[<()<>>{()[]}])[<({})<<>[]>><<[][]>[[]<>]>]]>>((<<<(<>[])[{}{}]>[<[]{}>({})]>>)<
+<[[[(<{[{((<{(()[])[{}<>]}([[][]][()<>])>[(<[]())<<><>>){({}{}){<>[]}}]))}]}>{<([<<[<(()<>)
+({{{<<<{({[{[<()[]>({}())]{<{}()>({}{})}}]{([(<>)<[]<>>]{([]<>)(()())})(<<<><>>{{}{}}>[({}{})<()
+{{<<[<[{<(({{({}<>)<<>()>}{{{}<>}}}{<({}())({}<>)>([<><>]{()[]})}))<[<{<[]{}>([][])}((<>())({}[]
+[[<([({<<<<{<{<><>}{()<>}>}>{(([[]{}>[{}()])[[[][]]])(<[[]<>](())>(<()[]>({}<>)))}>{<[<{{}{}}
+<<<[[(<[<<<{([{}[]]<[][]>){{(){}}[<>{}]}}><([{<><>}<[]()>]<[[]()]<{}{}>>)>>{(<[[(){}]](<<>()>[<><>]
+<<[<[<{[<[(<[<()[]>]{[{}[]][[]<>]}>)[{{[()()]{{}()}}{{<>}{{}<>}}}<{(()[]]{[]<>}}([<>()]<[]()>)>]]><{{<
+([([(<([((<{<[[][]](()[])}{<[]()>[<>[]]}}{({(){}}[{}[]]){{<>[]}[()[]]}}>[<({[]()}<()<>>)(<[]{}>([])
+<<{{([<<[{({[<{}[]>{()()}](<<>()>)}[[<()<>>{{}{}}]((<>[]){[][]})])([{((){}){[]{}}>{[{}{}]<()<>>}
+[(<[[<{({{{{{{<>()}([]{})}([()()])}([[()()]([])](<<>()>({}[])))}[{[[()[]][()()]]{[{}<>]}}<{({}())<[]{}>}<<<>[
+[({{{[(<{[[(<[<>[]]<[]()>>{{[]<>}})]<{([[]<>]([][])){{()()}{{}{}}}}>]}{{{[<({}())>(([]()){
+<({([<[([<<(<<<>{}>>[{<>[]}])>><<<(((){})[<>{}])<(()[])<{}<>>>>>([[[()][()]]])>]{<([<{[]<>}[{}<>]>]<{[()
+[([[{<({(([[{{{}<>)[[]()]}(({}<>)[{}{}])]]<<{({}<>)(()())}>{[[(){}]({}[])]<{{}{}}>}>)<{([[
+<(<<[{<<((<(<{<>[]}>[([]{}){<><>}])[{([]<>)(<>[])}(<()[]><[]<>>)]>))><[(<[([<>[]]<<>[]>){<()()}<{}>}
+<{{<([<{[{({({<><>}({}()))<({}<>)<(){}>>}[(<(){}>[{}<>])<(<>[])([]())>])}[[{({()<>}({}<>)){(<>())<{}
+[[(<({{<(({[{<()[]>{()[]}}]<[<()[]>{<>[]}]{{()[]}[{}{}]}>}(({({}<>)[[]{}]}[[[]()](()<>}])({{{}{}}}
+({<<[[[<<[(<([()()]{(){}})>)]((([<()><(){}>]<{[]<>}[[]]>)<(<[]<>>(<>[]))>)({[(<><>)[<>]]{<()
+{[((<{{{<(<<{{()()}}<({}<>)<[]<>>>}{{<(){}><<>[]>}{[<>{}]<()<>>}}>{<[([])<(){}>]><{[()<>](<>{})
+({([{<<(<{[[{[{}()][()[]]}([()[]]((){}))]<([<><>}{{}<>}){<[]<>>(<>[])}>]}[<[({(){}}(<>()))]>]><<({({<>{}
+[<{([<{({{<[<<()[]>[(){}]>{{{}()}(<>[])}]>[{((<>{})<{}{}>){<{}[]>}}[(([]<>)(<>[])){({}())[{}<>]}]]}<[[[{{}()}
+([{{({{{[(<(({<>{}}<[]<>>))((<<><>>){<{}>{<><>}})><<[([][]){{}()}]([[]<>])><({()<>}[[]{}])<({
+(([[<[[[([<<(<<>()>{(){}})<([]())<<>[]>>>{[<<><>>[[]]]}>])({({[<[]{}>]<[(){}][[]()]>}([<[]()>[()
+(<[[<[({(({[{[[]()][[]()]}]}(<[(()<>)[<>]]{(()())[<>{}]}><{([]{}){{}()}}>)))})({[[<[[<<>()>(()())]{<()[]
+[[([<<[[<<<((((){}){{}[]}){<{}<>><{}{}>}){{<{}[]>[<>[]]}(<{}>(()()))}>[(<(<>{}){{}()}>(([])<()>)}<(<<>()>)<{[
+{({{[[({{{{<({[]()}<[][]>)>}{(({[][]}[()<>])<<[]{}><[]()>>)<([[]](()()))[{[]<>}(()[])]>}}}}((
+{[(([({[[(<{([[]][[]<>])<<<><>>[{}{}]>}{<({}{}>{{}()}>{(<>{})[[]<>]}}>)((([{{}()}({}[])])[[{<>{}}]([()()])]
+[[{(((<(<<<((((){})[()()])<[()()]{[]<>}>)>><<{([[]{}])}>[{({<>{}})((<>{})<[][]>)}({([][])[<
+{({{<[<{(([[<<<>{}><()<>>>{(()())([][])}]{{{(){}}[()<>]}(<<><>>{[][]})}]{[<[[]{}]<{}()>>((<><>)(()()))]<(<()<
+<[({(<[{(<([<<<><>>>{{()[]}<[]>}]<[(<>{})({}<>)]((()[]){[]{}})>)<<[[()()]]{<[]<>>(()())}>>}<[{([<>()]<(
+<([<{[(((<((<{[]<>}<[]<>>>{<(){}>}))([[{<><>}{<>{}}]])>)(([[[({}())<<><>>][<<>[]>(<>())]]<<<<>{})[[]
+<{<{[(<<[<<{{{()<>}(()[])}((()[]){(){}})}>[{({<>()}[[]<>])[{{}()}<()[]>]}{([()<>][[]{}]][[{}<>][(){}]
+{([[{<({{[[{<<{}{}>{[]}}[(()<>){{}<>}]}(({[][]}{[]<>})[(<>)[()()]])]](<(<{()()}[<>]><[<>()]>
+({<[[([{[{({[<()()>[<>{}]]{[<>[]]<{}<>>}})}[([<{[]}<<>{}>>[([]<>)]][[([]())<<><>>]])]]}])]{<([({[(
+{{{{[[[{[[{(({[]()})){{(()[])<[]<>>}{<()[]>(<>())}}}]<{{<[<><>][{}()]>}[<{[][]}(<>[])>({[]()}
+[<{{([(<<{[<[[{}()]]<{{}<>}<[]()>>>[<<()<>>[<>[]]>]][[{<<>()>[(){}]}[<{}>{{}{}}]](((()>{{}}){[[]<>][
+[(<((({(<{<(({[]{}}(<><>))({{}()}{{}<>}))[<[<>()][[]()]><{{}[]}([][])>]>((<[[][]]>({{}()}<[]
+<[{{<[({{<(<<<{}<>>{(){}}>{{<><>}{{}()}}){([{}[]](()[]))[{{}<>}[<><>]]})(<[[{}<>]{(){}}]<{()[]}[<><>]
+<<({{[(({<{{{((){})<()()>}{[<>{}]{{}<>>}}{({()<>})[([][])<{}[]>]}}[{{{()<>}<[]()>}[<[]{}>{[]{}}]}[[[()[]]][({
+{{[[([([[{<<{[[][]]}>{<<<><>>{()[]}>{[{}()][{}{}]}}>}][[<([{<>[]}{<>()}]{{()<>}({}[])>)(<<[]{}>{[]<>}
+[[(<<{<[<[[<({<>[]}([]<>)}{<()()>}>]]{{<([(){}]{<>()})<[[]()][(){}]>><{<[]()>[<><>]}{(<>[])(()[])}>}}>[{
+<([{{<<{<({[<[{}<>][{}()]>[[()[]]{{}{}}]]<({[]<>}([][]))([(){}](()<>))>}<<({<><>}<<>()>)>>){[[([()<>]<{}
+{<<[[[[{<(<[[(()())<(){}>](<()[]><[]<>>)]<(<()[]>[<>[]])(<{}[]>({}{}))>><{(([]{})[<>()])<<{}[]>>}>)<({<{{}{}}
+<(({{([{{<([({()()}{{}{}})({[]<>}{<>[]})][(({}()){[]{}})({[]{}})]){<([<>]{<><>})[{{}[]}]><[
+[[{<<<<[<(<<<<[][]>(<>()]>{[<>()]{(){}}}>>{[<<{}()><<>()>><{[]()}{{}[]}>]<(<{}[]><<>()>)({[][]}([]{
+{[([(([[{{{[{{<>[]}}(<[]{}>)]>(((<{}{}><(){}>)([[]{}]))(<[{}{}]{{}()}>{[[][]][(){}]}))}}]](<(((<{<<
+<{{([[((({{[[[[]<>]<<>{}>][{()<>}{(){}}]]}[<<<[]<>><<>[]>>>]}<{[(<<>[]>(<>{}))[<{}()>(<><>)]]([{{}[]}{{}[
+[<[[{{([<<<{{[(){}](<>[])]<<(){}>{{}[]}>}<[{()<>}{<>[]}][<{}>[[]]]>>{[[({}())]<<<><>>>][({{}[]}
+[[(<[{[(({{[<<<><>><{}()>>{({}[])<<>{}>}}}}[[[<[()()]<{}()>><((){})(()[])>]]{[{{<><>}<()[]>}[({}<>)<[][]>
+({{[[<([<[{<[([]<>){[][]}]<((){})<<>[]>>><<<{}<>>[()<>]><{<>{}}{<>[]}>>]](([[(()<>){(){}}]<[<><>][{}{
+{([([<{([{[[[{[][]}<()[]>]](<<<><>>>{<<>()>({})})]}[(<<[{}[]][[]()]>[<[]<>>([]<>)]>)<{[<()(
+<(({[[<{{{[({(<>){{}[]}}[({}()){[][]}])[[{()()}<[][]>][<()<>>([]<>)]])}{[<[(<>{}){()}][(()()){[]<>}]>(([
+[<<[[<([([[[([[]<>]<<>{}}){<[]{}>[{}<>]}]((({}{})){{[]<>}([][])})](([((){}){{}{}}]){({{}[]}<{
+[[{{<{[<<[({<<()()>[[]<>]>[(()<>){()()}]}[<<{}<>>([]())>{<()[]>[{}<>]}])]><[{{{{[]<>}(<>())}[(()())([
+{<([{{(<<{([{<()()>{<>[]}}]{((()[])([]()))})}>{(<({<{}<>>}{[[][]](<>[])})><{<[<>]>[{()[]}{()[]}]}{{
+({(<{<{[{<{{([()[]]([]{}))[(()){[]{}}]}({{[][]}([][])})}<<<(<>[])[[]{}]>{[<>()](()())}><<[
+{[[<[<<[[{({{{[][]}<[]()>}}([{[][]}(()<>)][[<>()](()[])]))}([[({{}<>}(()[])){{[]()}(<>{})}][{
+<{[({{[{[[[<<({}[])<()>>(({}{})[[]()])>]<({(()<>)]<[()[]]>)[(((){})){((){}){<>[]}}]>]]}][{[[[(<
+(<(<{(<{{[{{{[<><>][[]]}}{(((){})[<>{}])}}{{{<[]()><(){}>}(<[]>{()()})}[<([]<>)>]}]}[<((({(){}}<
+{<(((([[{{[<{[()[]]{<>[]}}[<{}<>>{()()}]>](([<[]{}>[{}{}]]{{()[]}{(){}}})<{({}[])[{}<>]}({<>[]}({}()))>
+[<<(<({[[<{([[<>{}]<{}<>>]{{<>{}}[[][]]})<(<(){}>{[]{}}){([]())[()()]}>}[<({<><>}[<>{}])[(<>())[<>{}]]
+(<{<{[[<(((<[{<>()}<{}()>]><[[[]{}]]({(){}}{<>()})>){<<[[]()]{<>[]}>>[[<<>[]><{}[]>][{[]{}}
+({[{(([[([[[[{()[]}]][{[()]}({[][]}([][]))]](<{<{}[]>((){})}{[()<>]<{}[]>}>[(([][]){[]<>})[(<>()
+{[{((<{<{[<[{[<><>](()())}]>(<(<()()>)>{(([])<[]()>)<<()<>>[<>[]]>})]([<([<>[]](<><>))((<><>))>])}
+<[<[[<<<{[[{((<>{})[<>()]){[<>[]]<{}<>>}}(<[(){}]{{}()}>{({}{}){{}{}}})]]([[[[()()](()[])][{(){}}(()()
+([{<[{<{<{<<<(())[<>()]>[<<><>>]>(<[<><>]<{}<>>><{{}{}}[()[]>>)>[<[[<>()][[]{}]]<[()()][<>[]]>>(<({}[])<{
+{[[{<{<<<(<[<(()())[<>[]]><[()[]]>>[<[(){}]<<>[]>>{<{}{}>[()<>]}]>)>>><<<[(<[<{}()>[<>()]]
+(<[[(({<<[((<(<>())>[[[]()]([])])<{[<>()]{<>[]}}[<<>[]>]>)(<<[<>{}]<[]()>>>[{{[]{}}<()<>>}{(
+{{<<[<<<[[{{{<<>()>(<>())}[<<>()><[]<>>]}<(<<>()>{(){}}){<<>()>}>}[<{(<>[]){{}<>}}[{(){}}[(){}]]>{
+([{<(<[{[([(<{{}[]}((){})>[<<>()>[()[]]])]({<([][]){{}<>}>})){[{({[]{}}([]<>))<[[]<>]>}]}]}[<[{[<[<>
+(<{{([<<<{([[<()>([]<>)]<[[]{}]>]){({<<>()><<>()>}[[[]<>><[]>])<{([])[[]<>]}<<<>{}>{[]()}>>}}><[(({{{}()}
+<{<<[[([(<(({[<>{}]<<>[]>}[([][])[[]()]])[{<<>[]}{[]()}}{[()()]([][])}])>[(<({<>[]}<(){}>)<<()<>>[[][]]
+((<([[[<<{{[<(()())>]}}[{<<{{}{}}{()[]}>{{<>{}}}>{([[]{}][()<>])({(){}}<<>[]>)]}{<<<<>()>><<(){}>{{}[]}
+[<<<{<{[[{{<<[[]](()[])>{({}{})[{}()]}>[([{}]([]())){(()[])<{}<>>}]){[{{[]}[[]]}<{[]{}}<()()>>]}
+[[(<((<{[<<[[[(){}]<()()>]{(<><>)[<>[]]}]>((<{()<>}[<>[]]>((()())<{}[]>)))>[([<<{}<>>({}[])>((()<>){[][
+[<(<(({[{<<<[({}[])[[]()]]>{<<<><>>[()()]><[[]()]{<><>})}>[[<([])(<>)>{[(){}](<>{})}][{[[]()][{}<>]}<
+([<{[{((<[([({{}[]}[{}[]])<{[]{}}<<><>>>]{<(<>{})[<><>]>({[][]}<()<>>)})[<(<{}[]>({}{})){{[]()}}>(
+[<[<({<({((<[{[]<>}({}{})](<{}()>{[]()})>{{[[][]][()()]}([[]()]([]{}))}){[<[[]()]>[<[]()>{()<>}]]})}<[[{{<[]
+<{[[[[[{(<((<{[]{}}({}[]]>(<()[]>))){[({<>[]}{{}()})<[[][]]<[]<>>>][{{()[]}(()<>)}{(<>{})<[]<>>}]}>({[([
+[(([[<[{<[[<{{()<>}[<>()]}(({}()){()<>})>]]<[{{{()[]}{<><>})[{[][]}]}]>>[[[{[{()<>}[<>()]]({
+([[([([<{{((([<><>]){[<>{}](()[])}){<<<>()>[{}()]>})[[<[{}()]([]{})>]]}{[{{([]()){(){}}}(<{}{}>)}{[<
+{{{{(<[(<(<[{([][])[<>()]}<{{}()}>][<(<><>)<[]<>>>{{<><>}[()()]>]>([({[]()}(()[]))[({}[])((){}
+<[<<<<({<[[{(<{}()>[[]])}]{<([{}()]>{<{}<>>[[]<>]}><(([]()){[][]})[(<>()){<>[]}]>}]({{<<()<>>(<>())>[({}
+[{(<<([[{(<{<[()[]][<>]>[{<>[]}<()[]>]}>[([{[]<>}{()<>}])({(<>())}{<{}[]>{[]()}})]){([[<[]<>>{{}{}}]([[]{}][[
+<[(<<<<<<{{([[<>()]{{}()}]<({}[])({}<>)>){{[[]<>]({}[])}}}({<(<>())(<>())><([]){[]<>}>})}{{(<({}{}
+[[<[{{<<<([[<{<><>}<()<>>>{{()}({}{})}]{[<{}[]>{[]{}}][{<><>}(<><>)]}](({<<>()>})[<<[][]>[<>()
+[[{<{((<((<([<[]<>>(<>())])(<[{}[]][()<>}>(((){}){[]()}))>[{(<<>[]>{<><>}){<(){}>}}[<(()[]){()}>]]){(({{{}[]}
+(({{{[{([<[<[{()()}][(()[])(<>())]>{{<[]<>>{[]()}}{[<>[]]<{}()>}}]<([{()()}<(){}>]{[<>[]}<()<>>})>>([<<{{}[]
+{<<({<[({{{(<({}{})<[]()>><({}[]){()[]}>)(((()<>)<{}{}>)({<>()}({}[])>)}{({<{}{}>{(){}}}(<[]{}>{<
+<<[<{<<[<{([([{}[]][(){}]){([]())[{}()]}])}>{{([{[()()]<[][]>}[({}[])((){})]]{({[]{}}[[]<>]){(()())({}[]
+[[({<{[(({<({<<>{}><[]{}>}[({}()){<>[]}])>})[[<([<[]>[{}<>]][([]{}){[]}])>(<[[<>()}{<>{}}][{()[]
+{[<[[[{[<[{{<{{}<>}{<>[]}>{([]<>){{}{}}]}}<{((<>{})[()()]){{<>()}<{}[]>}}<<<<>[]>>{[()[]][{}{}]}>>]{[({{<>()}
+[([[<<[([[<[{[<><>][()<>]}[[[]<>]<{}>]](([[]<>]<<>{}>))>(<{<[][]>{{}()}}{[[]()]{<>[]}}>[[<()<>>({}<>)]]
+[{<(({<[<[[[[{<>[]}]]([{()<>}<()[]>]([[]<>]<<><>>))][{<{[]}{[][]}>[[<>{}]<[][]]]}<[(<><>)[<
+<[[<{<<<(([([[{}{}](()<>)][([]<>)[<>()]])][<<({}())[[][]]>>])<<<[({}<>){()<>}]>[[[(){}][[]]]<<()<>>}]>[<(<<>{
+(({{((<{[{({(([]{})<()>>{{{}()}([]<>)}}){<((<>())(())){<()()>([]())}>}}[{(<<<>{}>>[<(){}>{()<>}])}
+<[<[(([{<[{(<<<>()>[{}<>]><<<>()>[{}{}]>)<({[]{}}[{}[]])[[()<>]({}<>)]>}<[<{[][]}<[][]>>[<<><>>]][{({}[])
+{[{<[([[[[({{[{}{}]{[]()}}<([][])[[][]]>}{({<>()}(<>[]))[({}<>)[<>{}]]})]]]{{{{[[[{}[]](()<>)][

2021/day10/src/main.rs

@@ -0,0 +1,92 @@
+use std::collections::HashMap;
+use std::collections::HashSet;
+use std::io::stdin;
+use std::io::BufRead;
+
+fn main() {
+    let arg = std::env::args().nth(1).unwrap_or("part2".to_string());
+    match arg.as_str() {
+        "part1" => part1(),
+        _ => part2(),
+    };
+}
+
+fn part1() {
+    println!("Part 1");
+
+    let opening_brackets = HashSet::from(['(', '[', '{', '<']);
+    let closing_brackets = HashSet::from([')', ']', '}', '>']);
+    let bracket_map = HashMap::from([('(', ')'), ('[', ']'), ('{', '}'), ('<', '>')]);
+    let score_map = HashMap::from([(')', 3), (']', 57), ('}', 1197), ('>', 25137)]);
+
+    let mut score = 0;
+
+    for line in stdin().lock().lines() {
+        let line = line.unwrap();
+        println!("{}", line);
+        let mut bracket_stack = Vec::new();
+        for bracket in line.chars() {
+            if opening_brackets.contains(&bracket) {
+                bracket_stack.push(bracket);
+            }
+            if closing_brackets.contains(&bracket) {
+                let opening = bracket_stack.pop().unwrap();
+                let expected = bracket_map.get(&opening).unwrap();
+                if bracket != *expected {
+                    println!("Error! Expected {}, but found {}", expected, bracket);
+                    score += score_map.get(&bracket).unwrap();
+                }
+            }
+        }
+    }
+    dbg!(score);
+}
+
+fn part2() {
+    println!("Part 2");
+
+    let opening_brackets = HashSet::from(['(', '[', '{', '<']);
+    let closing_brackets = HashSet::from([')', ']', '}', '>']);
+    let bracket_map = HashMap::from([('(', ')'), ('[', ']'), ('{', '}'), ('<', '>')]);
+    let score_map = HashMap::from([(')', 1), (']', 2), ('}', 3), ('>', 4)]);
+
+    let mut scores = Vec::new();
+
+    'outer: for line in stdin().lock().lines() {
+        let line = line.unwrap();
+        print!("{}", line);
+        let mut bracket_stack = Vec::new();
+        for bracket in line.chars() {
+            if opening_brackets.contains(&bracket) {
+                bracket_stack.push(bracket);
+            }
+            if closing_brackets.contains(&bracket) {
+                let opening = bracket_stack.pop().unwrap();
+                let expected = bracket_map.get(&opening).unwrap();
+                if bracket != *expected {
+                    println!(" Error!");
+                    continue 'outer;
+                }
+            }
+        }
+        bracket_stack = bracket_stack
+            .iter()
+            .rev()
+            .map(|bracket| *bracket_map.get(bracket).unwrap())
+            .collect();
+        print!(" Incomplete: add {:?}", bracket_stack);
+        let mut score: i64 = 0;
+
+        for bracket in bracket_stack {
+            score *= 5;
+            score += score_map.get(&bracket).unwrap();
+        }
+        println!(" Score {}", score);
+        scores.push(score);
+    }
+
+    scores.sort();
+    let median_idx = scores.len() / 2;
+    let final_score = scores.get(median_idx).unwrap();
+    dbg!(final_score);
+}