From 50cd6d817100ea765b7c5ee7fd3fdfb14080c2f9 Mon Sep 17 00:00:00 2001
From: Bert Peters <bert@bertptrs.nl>
Date: Fri, 10 Dec 2021 10:46:02 +0100
Subject: [PATCH] Implementation day 10 2021

---
 2021/inputs/10.txt      | 102 ++++++++++++++++++++++++++++++++++++++++
 2021/src/day10.rs       | 102 ++++++++++++++++++++++++++++++++++++++--
 2021/src/samples/10.txt |  10 ++++
 3 files changed, 210 insertions(+), 4 deletions(-)
 create mode 100644 2021/inputs/10.txt
 create mode 100644 2021/src/samples/10.txt

diff --git a/2021/inputs/10.txt b/2021/inputs/10.txt
new file mode 100644
index 0000000..3de0014
--- /dev/null
+++ b/2021/inputs/10.txt
@@ -0,0 +1,102 @@
+[(<[(({{<{{[{({})}{<{}{}><()<>>}]}[{[({}{})]([{}()](<>{}))}[<<[]()]>[<[]<>>{[]()}]]]}{[[[{[][]}{[]()}]
+(<<{((({<(<{([()[]]<[]<>>)}>({[{<>()}]<[<>()]({}())>})){{[(<<><>>{<>()})<{[]{}}>][{[[]()]<[]()>}
+{({([({[[([<{(())([][])}<(<>())[[][]]>>{{{{}{}}{<>{}}}({{}<>}<<>()>)}]<<((<><>))<<[]>((){})>>[<{{}{}}
+(<[{{{[[[<[[[([]<>)]{{()()}<()()>}][({()<>}(()()))[<[][]>[[]<>]]]]([{[(){}]}(<[]{}>{{}()))]<
+{(<<({<{<<[[<[[]{}]>]<[<{}{}>[{}[]]]{[<>{})({})}>]><([[{(){}}{()[]}]])>><{({<[{}()]<{}[]>>(<
+<<[[<<[({[<[{{[]()}[()()]}[<{}{}>[<>]]]><[[(<>[])]]{{{{}<>}[{}()]}{<()>[{}[]]}}>](({<((){}
+<{[[((<{{[[(([(){}][()<>]))[(<()()>[[]<>]){[(){}][()[]]}]]]<([<[{}{}]([]<>)><<{}<>>{{}{}}>]<({[]{}}[{}{}]
+<<<{<[[[[([<([[]<>])[[<>{}][[]<>]]>{{[{}{}]}[[[]()]]}][[<((){})<[]<>>>]<{[(){}][[]<>]}<<[][]](()())>>]){<((
+[<{{({<<[{{<<(()())[{}[]]>{[<>{}]<[]<>>}>{[([]<>)[{}<>]](({}<>)[(){}])}}}[[(<{()}{<>()}>)<{<{}{}>([
+<{<[{[[<[({{[[{}[]][()()>]((<><>)[[]{}])}{({{}{}}[()])<{<>{}}(<>[])>}}<<(<<>[]>[()])>>)]({{[([<>])(<{}[]>{
+(({<{<{[[([<<{{}{}}>(<<>{}><()()>)>]{{(<{}>{{}[]})}(<([][]][<>[]]>{{<>{}}[<><>]})})(<[{{<>()}({}{})}{{{}[]}{<
+{{[<<{{(({{{<{<>{}}{[]{}}>[<[]{}>{()()})}}(<({[]()}[()<>])[{<>()}<[]()>]>[[[{}[]][<>{}]]<{<
+{{{<<<[(<[({([()()]))[<[()<>]{()()}>((()[])([]()))])][([<{{}()}<[]<>>>](([<>]<<>{}>){({}<>){[]<>
+<<({{[([{{<[[<()()>{(){}}]{{()<>}[(){}]}]{[({}{})([]<>)]}>(<([{}()](()[]))({<>()}<<>[]>)>[<[()<>]<
+{(<{{([{<{<(<({}{})([]())>)>{[{{{}[]}(<>{})}{([])<{}<>>}]<{<{}()><()[]>}<{[]{}}<[]>>>>}>}<(<<([
+([([(<{<[(<[{<<><>>(()<>)}(([]{}))][<(<>{})<{}>>{[()[]](<><>)}]>[[[{[]{}}[[]{}]]]<{[()[]]}[[{}{}]<<><>>]>])
+{<<({({{{[({[[<>[]]({}())]{[{}()]}}({[()()]{[]<>}}((()<>)<[]{}>))){[{{{}()}{{}()}}]}]}<<<[[<[]()>][
+{{[[[{<<[(([{[<>{}]<<><>>}{{<>}{[]<>}}]<[<<>[]>({}{})]>)({<{()()}>{{()[]}({}())}})}]<([{[<[][]>{()[]}]}]
+(<<[<[[[<{{[{{()}[{}[]]}[<{}<>>{[]{}}]]{{[()[]]<(){}>}}}(((<{}{}>{()()}))[<{<>()}{()<>}><[
+[[{[<([([<<[[[()()]{()<>}]({<>{}}[<>[]])]>(<([<>()]<()<>>)[[{}()]]>)>])]){({{{[{<({}[]){[]()}><<[
+(<[<[(([({{[({<>[]}[<>[]])[([]{})[<>[]]]]([<{}}[{}<>]][(()()){{}()}])}([<({}())[[]<>]>([[]{}]
+{([[((<(<([{([<>[]]{()})[(()[])]}])(<[<{{}()}>]>)>)>)){{{<<[<[<(<><>){<>[]}>[[<>{}]]]({<<>{}>
+<<(((({<<[{([({}{})[<>()]]<<(){}>({})>)}{<<{[]{}}{<><>}><{<>{}}[()[]]>}<(([][])(<>[]))<[<>[
+{{{[{[[([({{{<{}{}>{()}}((()[]]<<>{}>)}}<[{[{}[]]<<>[]>}{[{}[]][()<>]}]<<({}[]){()()}><{<>{}}(<>[]
+[[([(([({<[<([<>()][[]()])>{{<[]{}>[<>()]>[([]{})<(){}>]}]({[(()<>){{}()}]}<{(<><>)({}{})}{[[]<>]{{}()}}>
+(<{([{{([<{<<<<>[]><[]()>>[(()[])[<>()]]>{({()<>}{(){}})<<{}<>>{<>{}}>}}[[{<{}()>}<(()<>)[()<>]>]{[[<>
+<[[{({[<<<{{<[<>{}]({}<>)>(<()[]><[]>)}(<{{}()}<{}{}>>{{()}<[][]>})}[{({[]{}}(()[]))<[[]{}][[]{}]>}<{{<>{
+{({[[<{<([<((({}{})[{}{}])){{[()<>]<<>()>}[(<><>){[]}]}><<<<()<>>(()<>)>>[{([]){<>{}}}]>]){({{[{{}
+(<<[{[<<({<{<[<>[]][{}<>]>([{}<>]<<>()>)}{(<{}{}>{{}()})<([])>}>{(({[]())(<>[])){[[]<>][<><>]}
+[({(((<(<<{({<()()>({}()>}((<>[])[[]]))}>{<(<({}<>)([]())>[{()<>}<<>>])<<([])<[]()>>{(<>{})[<>{}]}>>[[
+<<{[(({<<{[{{<<>()>{<>{}}}({[]}{()})}][<[[[]()]]<<{}{}}[<>()]>>]}[<(([{}{}]<()<>>){{()<>}[[]<>]})<{<[
+(<[[{{{<<(<<[<()[]>(()[])]<[()()]([][])>><{({}<>)[<><>]}>><[(({}){[][]})((()()))]>){{<[([]<>)[<><>]
+[[[[<[<[[[<(([<>{}]<<>()>)(<<>()>{{}{}}))[([()()]([]<>))]>(<[([]())<[]<>>]{<{}{}>{{}{}}}){(<()[]
+{[<(<[[<{<{[{({}[])[<>{}]}<[()<>]>][(<{}<>>(()[])){{()()}<()[]>}]}[<[(()[])]({{}{}}(<>{}))>]>}<{{[{([]{})<(){
+(<[{{{{{{[{[{(<><>)({}<>)}[(()[]){<>[]}]]}[{([{}<>])}]]}((([{[[]][[]{}]}({<>()}[()[]])][({[
+(<<<<[[{{<<((<{}()>[<><>]))<[<<><>>([][])]<{{}<>}([]<>)>}>{{[(<><>){<>{}}]{<<>()>(()())}}[<[<><>]{{}
+{({[[<({<{[[[[[]<>](<>{})]((<>{})<[]()>)]([<()[]>({}<>)][[[]{}>[{}()]])]{({<[][]><[]()>}<(<>{})>)((({})
+{[([[{<<[{<<[<()()>[{}[]]]>{(({}{})([]<>))[[{}()][()<>]]}>[<(([][])){[{}{}][{}{}]}>{{<(){}>([]<>)}
+([{<{{{(<[{[{{[]}[()<>]}(<[]{}>{()<>})][(<[]><{}<>>)<([]{})(<>[])>]}][[{[<[]{}>][[<>[]]{<>[]}]}<((()[])(
+<(({{<<[[<<[[(<>[]){[][]}]{({}())(()<>)}]{({{}<>})}><([<<>()><{}[]>][[<>{}]({}())])[(([][])({}<
+[<<{{{[[[((<{([][])<<>()>}((<><>)([]{}))>))[<(<[<>()]><([][])<<><>>>)>[[<<{}{}>(<><>)><{[]{}}>}{({
+<<{<<[[[(((({{[][]}[{}[]]}(<<>{}><{}<>>))[(([]<>)<()[]>)<[<><>]>]))<<(<<<>{}>>{(<>[])})<[<<
+[<<{({{<[<[<<({}[])(<><>)>(([]{})([]<>))>]>]{[(<<{(){}}[[]<>]>>){([<{}()>[()()]](([]())[<><>]))
+{({<[<[{(<{[([[]<>]{<>})<{<>[]}([])>]}<{((<>[])[{}[]}){{{}{}}<[]<>>}}<{[[]{}](()[])}<(()())
+(({{<{<[[(<[([<>()][[]()])<({}<>)(()())>]{<<<>[]>{(){}}>}>([{({}())}{<[]>(())}]{<<[][]>({}[])>}))]
+{{<{{(<[[[{<<<[][]><{}[]>><(())[{}[]]>>}][<(([[][]][<>{}])(<[][]>)){{([][])<{}{}>}[[[]{}]{[
+[([{<[[<[{([{<[]{}>(<>{})}]<{[[]()]}[<()<>>]>)}][([[[([])<<>()>]{<{}<>>[()<>]}}((<{}{}>(()<>))(<{}
+([<{(<({((<{<{()[]]{[]<>}>(<[][]>(()<>))}{<[()[]](()())>{([][])<<>>}}>))(<[(({[]()}(()[]))([(){}]{<>
+([{{[{(<[((<<[[]()](()())>{<{}()}{[]}}>{(({}<>))<<<>{}>[{}()]>})[[((<>)<[]<>>)([()()]{<>{}})]<{[(){}]{[
+<[<[<[[[({{{[[()<>]([]())]}}{({[()()]}{{<>[]}<<>{}>})[[{[]()}[{}{}]][{<>()}<{}{}>])}})<<{([{()[]}<[]
+<([[<{<<{(<(<{[]}[{}()]>({()}{<>()})){{[[]()](<>[])}(<{}{}>(<><>))}><{{{(){}}<<><>>}}>){(([[()<>]<<><>
+{(([(<[<{[[<{(()[])[{}<>]}<<{}()>>>([({}<>){<>{}}]([()[]]{{}()}))]({[[[][]]]})]}>][({[{<<([]<>){()<>}>({<><
+([<(((<[<({<[({}{})((){})]{{()<>}<[]<>>}>{[{()[]}<<><>>]({{}<>}[[]<>])}})[[{([[][]](()[]))({()[]})}((((
+{<[{[(([<(<{<[<>{}]>[((){})({}())]}{(<(){}>{[]<>})([()<>](()<>})}>[(<{[][]}{<>[]}>[<[]<>><<
+[<<{((<(<((<<{[]<>}{[]<>}>{[<><>](()())}>{([<><>])[([]{})(<>[])]))(<<{[][]}{{}()}>[<<>{}>{{}{}}]><[({}{
+(<([((({{([[<<{}()><()[]>>[{()<>}{{}{}}]]{<({}{})[[]<>]>{(()[]){<>}}}][{{({}{})}<([]<>)<()[]>>
+({([[<<[[[[([<()()>{{}<>}]({{}[]}))]<{(<(){}>[()()])}>]{{<([<><>]{[]{}})<<{}<>>[()<>]>>}{[
+<({{(<<((<<(<({}{})<{}()>>{{<>}})([[{}()]{{}()}][<<><>>])><{[<[]()>[()()]]<([]())>}>>[<<<{()}<
+[[[(<((({{{{<{[][]}{<>{}}><{[]{}}<()[]>>}<([{}{}]{{}<>})>}<({[[]<>][[]<>]}[[()<>]<(){}>])>}{{(
+(<<{({[{({[{(([]<>)({}[])}[<(){}>]}]})}][({(<<{(()())}[<(){}>(()[])]><({<>{}}<()()>){<[][]>[(){}]}>>
+([({{{{{([{[{([][])<[][]>}<{()<>}<{}<>>>]}{[{([][])}<<()()>[{}[]]>]{<[[][]]{[]<>}>}}]<[(<<[]<
+[([<({(<({[<{[{}<>]}>{[(()<>){<>()}]}](([([])[<>{}]])<[[()()]{[]}](((){}]{[]{}})>)}[<[<{<>[]
+[({<[(<<{<[{[[(){}]<<><>>][<(){}>[{}[]]]}(({{}()}<[]<>>){([]()){{}()}})]><<(<<<>[]>{<>}>(({}()){<>()}))[[(<
+{{{{<{{<<{[<([()[]][{}[]])[{<>{}}[(){}])><((()[]){()[]})[[{}[]](()<>)]>]}>>}}>{{[[{<(<(({}<>)[<>()]){[
+([<{[<<[{({([<(){}>([])][(()<>)<<>()>])}{[([[][]]{{}()})<[{}]({}<>]>](([[]()]<{}<>>){<{}()>[[]()]})})[<
+<((<{({[<(<(<<{}<>>{[]()}><<()<>>([][])>){<<[]{}>{<>[]}>{[<>[]][()()]}}>(({{()}{()<>}}({[]<>}(<>{})))
+<[(<{{{<[(([{{[]<>}{{}()}}<[<><>]<<>[]>>]({((){})}))<(([<>()]<[][]>)(<()<>>([]<>)))>)]>[[[[[{[
+(({{(([{{((<{<<><>><{}<>}}{{{}{}}{[]()}}>[[(<>[])[{}{}]]{<()[]>[[]{}]}])){{{{{()<>}<<><>>}{<[]<>>[[]<>]
+(<{(((<<(({{{{[]()}}<<()()>{[]>>}[<{<>{}}{<><>}><{{}()}({}<>)>]}))(([((<(){}>({}()))<{<><>}<[]()>>)<(
+<[[<[(<<{((<[<[]()>([]<>)]{(<>[])[<>()]}>[<(()<>){[]()}>{{[]<>}([][])}])[<(([]<>){<>()})([{}()]<[]{}>)>({
+<<[[({<<({<{[({}[])<()<>>][[(){}]{[]()}]}[{<(){}>[<>[]]}{(<>[]>({}<>)}]><<([[]<>]({}))<{[]{}}(<><>
+<(({([<<(({[{[[]<>]({}())}[{<><>}[[]()]]][(<{}()>)[{{}{}}[{}{}]]]}<{(<()<>>{()<>})<[()[]][{}{}]>}[[(<>[])
+[<{<({{(({(<[{(){}})(<<>()><<>()>)>)<{<({}<>)[{}[]]>(<()()>(<><>))}{([<>[]][()<>])[{[]()}{[]}]}>}))<(
+[<{<[[(<([<[<<{}<>>>{[<>[]]({}())}>{[(<>{})[(){}]]{[<>[]]}}>][{<{<[]()>{{}{}}}[[[]<>]<(){}>]>([<<><>>[{}{}
+<<(({[<<{<([[{[]()}{<>()}]<[[][]]>][(((){}){<>{}})([{}()]<[]<>>)])>}>([[<<(<[]<>><()()>)<[()(
+{<({[{<<<{[({<()[]>}[<<>()>[(){}]])<[(<>())<[][]>](<[]()>[{}<>])>]((<(<>{}){<>{}}>{{[]()}([])})[<{{}
+[<([(<[{(<([<(<>[])[()()]>{[()<>][<><>]}]<[{{}[])]((<>())[[][]])>)>({(({<><>}({}[]))<{{}<>}([]<>)>)
+{<[[({<[([{<{({}()){{}{}>}>{{[()[]]}[(<>[])<{}()>]}}])[[<(([<>]<{}<>>)([{}]{<>}))<({<><>}([]<>))<[<>[]][
+{(<[[([[([{{[((){})(()<>)]}}[<(([]<>){{}{}})>{<[[]{}]{()()}>({{}()}[<>])}]][[(<[[]<>]<<><>>>
+<{[<{{((<({{{[()[]]([]<>)}({{}<>}<{}()>)}(((()<>)[[]{}])[([]<>)<{}()>])]([[<()[]><<>()>]]<{{[][]}[[]]}>))>)<<
+{([([<<((([(<([]<>){[][]}><{[]()}<<>{}>>)(<[<>()]([]<>)>[[[][]]<<>()>])]))(((<{<[]()><()<>>}([[]][()[]])>)<(
+{<[(<<((<<({{[{}[]][<>[]]}[{{}<>}((){})]}<([()<>][{}[]])<{<>[]}({}())>>)(<[<(){}>]{{()[]}<()()>}>(<<()[]>
+<(<{[({{<<{[({<>()}{<><>})(<{}{}>(<><>))]{<<{}<>>({}{})>}}[({(<>{})({}{})}{<{}{}><{}{}>})]}[<(
+{<[([<(([([<(<()[]>(<>[]))[[()][<>()]]>[[{{}{}}(()())][<(){}><{}<>>]]]<((<()>((){}))<{{}{}}
+((({{(({{[<[<{<>}<[]{}>>{([]{})<{}<>>}](<{<>{}}<<>()>><{(){}}[[]()]>)>({<([][]}<<>{}>><<{}()><{}{}>>}
+[([{[<[[({[(<{<>[]}[{}[]]>(({}[]}{[]<>}))[<{<>{}}{<>()}>(([]<>))]][<(([])<{}()>)[<{}<>>{[]<
+([<{(<[<[{([<[()[]]<()<>>>]{[{[]{}}<<>()>]}){[[[<><>][<>[]]]<({}[])<[]()>>](([[][]]<{}()>)[[<>{}]{()[]}])}}{
+[[[([{{(({<[[<<>{}>(<>())][((){})]]]{((<()<>>{[][]})((<>())(()<>))){<<<><>>(<>[])>}}}(({<([]
+({{[(([<(<([<{(){}}({}())><[{}<>]>]{(<<>{}><(){}>)})>){[<[<(()()}[<>{}]>((<><>)<<>()>)][([{}{}]){(<>[])[[
+{([{((({(((([(()<>){[]()}](<{}[]>[{}{}]))<((()()){{}{}})[<[]()>]>)[((<<>[]>[()[]])(<{}<>><<
+([[{[[[{<{[{{([]<>){()[]}}}]{({(()<>)({}{})}[<{}()>{[]{}}])<{[<>{}]}>}}>}]]]{<[({(<[<([]()){
+((({[<<<{{(([({}<>)<[]<>>][{{}{}}])){([[()<>]]({(){}}[<><>]))((<()()>[{}<>]){{()<>}(()[])})}}<({((
+<<<(<{(<([<{[[{}{}]]<{(){}}({}())>}[<<{}()><{}{}>><(()()){()<>}>]>]]>{<[([<<()<>>((){})>][[[()[]]<{}[]>]<(<>{
+([{<[[[[[[{(<<()<>>([][]>>)({{()[]}<[][]>}((()()){()[]}))}((([{}<>]([]<>)){<<>()>{[][]}}))]<<[[[[]()][[][]]
+{<<[[{{[([<<<{()<>}>[((){}){[]{}}]><({<>[]}[{}])([[][]]({}{}))>>[(([[]<>]){<()<>>[<>{}]}){<<(){}>({}{})>[{
+<{(<(<([(<<([<[]<>>(<>{})][([]())<[][]>])([[<>()](()[])])>({(<{}<>>([][]))}[{[[][]]{(){}]}]
+{[({{{[([{<((({}()){(){}})((<>[]){<>{}}))<<([][]){{}[]})[{{}{}}{{}[]}]>>}[{[[[<>[]]([]{})]<[{}()]<<><>>>](<((
+[[{[(({<[[[({((){})<()<>>}{{<>{}}[()()]}){[([]{})([]<>)][{{}}<<>()>])][{([{}<>]({}())){([]{}){
+((<[{(({<{<(((<>)<{}[]>)([<>[]]{()()}))>}>}[[<[{({[]{}}{[][]})}(<{{}[]}(()[])>(({}()){<>[]}))]<<([{}][()[]])>
+<(({<[[<{{<<<[{}{}]{(){}}>{<()<>>[<>{}]}>>}[[{[([][])(()())]<[()<>]>}{<<(){}>[()[]]>([[]<>]<[][]>)}][{
+<{((<({{({<<{([]<>]{<><>}}((<>[]){<><>})>>{<{[{}{}][<>[]]}>({{<><>}[[]]}<{(){}}[<>{}]>)}})}})<((<{[(<<()(
+[(({({{([([{{<[]<>>([][])}<[()<>]>}{(({}())[<>()])}]<({{{}{}}}({{}<>}<[]{}>))>)(<[[<()>((){})]
diff --git a/2021/src/day10.rs b/2021/src/day10.rs
index 113ba49..22b39de 100644
--- a/2021/src/day10.rs
+++ b/2021/src/day10.rs
@@ -1,9 +1,103 @@
 use std::io::Read;
 
-pub fn part1(_input: &mut dyn Read) -> String {
-    todo!()
+use crate::common::LineIter;
+
+macro_rules! check_matching {
+    ($stack:ident, $total:ident, $match:literal, $score:literal) => {{
+        if let Some($match) = $stack.pop() {
+            continue;
+        } else {
+            $total += $score;
+            break;
+        }
+    }};
+    ($stack:ident, $match:literal) => {{
+        if let Some($match) = $stack.pop() {
+            continue;
+        } else {
+            $stack.clear();
+            break;
+        }
+    }};
 }
 
-pub fn part2(_input: &mut dyn Read) -> String {
-    todo!()
+pub fn part1(input: &mut dyn Read) -> String {
+    let mut reader = LineIter::new(input);
+
+    let mut stack = Vec::new();
+    let mut total = 0;
+
+    while let Some(line) = reader.next() {
+        stack.clear();
+
+        for &c in line.as_bytes() {
+            match c {
+                b'(' | b'[' | b'{' | b'<' => stack.push(c),
+                b')' => check_matching!(stack, total, b'(', 3),
+                b']' => check_matching!(stack, total, b'[', 57),
+                b'}' => check_matching!(stack, total, b'{', 1197),
+                b'>' => check_matching!(stack, total, b'<', 25137),
+                _ => panic!("Invalid bracket '{}'", char::from(c)),
+            }
+        }
+    }
+
+    total.to_string()
+}
+
+pub fn part2(input: &mut dyn Read) -> String {
+    let mut reader = LineIter::new(input);
+
+    let mut stack = Vec::new();
+    let mut scores = Vec::new();
+
+    while let Some(line) = reader.next() {
+        for &c in line.as_bytes() {
+            match c {
+                b'(' | b'[' | b'{' | b'<' => stack.push(c),
+                b')' => check_matching!(stack, b'('),
+                b']' => check_matching!(stack, b'['),
+                b'}' => check_matching!(stack, b'{'),
+                b'>' => check_matching!(stack, b'<'),
+                _ => panic!("Invalid bracket '{}'", char::from(c)),
+            }
+        }
+
+        if !stack.is_empty() {
+            let score = stack
+                .drain(..)
+                .rev()
+                .map(|c| match c {
+                    b'(' => 1,
+                    b'[' => 2,
+                    b'{' => 3,
+                    b'<' => 4,
+                    _ => 0,
+                })
+                .fold(0u64, |acc, s| 5 * acc + s);
+            scores.push(score);
+        }
+    }
+
+    scores.sort_unstable();
+    scores[scores.len() / 2].to_string()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use crate::test_implementation;
+
+    const SAMPLE: &[u8] = include_bytes!("samples/10.txt");
+
+    #[test]
+    fn sample_part1() {
+        test_implementation(part1, SAMPLE, 26397);
+    }
+
+    #[test]
+    fn sample_part2() {
+        test_implementation(part2, SAMPLE, 288957);
+    }
 }
diff --git a/2021/src/samples/10.txt b/2021/src/samples/10.txt
new file mode 100644
index 0000000..b1518d9
--- /dev/null
+++ b/2021/src/samples/10.txt
@@ -0,0 +1,10 @@
+[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]