diff --git a/2021/inputs/day10 b/2021/inputs/day10
new file mode 100644
index 0000000..adeda77
--- /dev/null
+++ b/2021/inputs/day10
@@ -0,0 +1,90 @@
+<[<<<<[{[<({{({}<>)<[]{}>}[<<>{}>{<>{}}]}{(({}<>){()<>}){{[]<>}{[]}}})>([{{(()[])[{}()]}}(<{{}<>}
+<<[<<{[<<<{{<(()[])>[({}{})]}}({{({}())[<>{}]}}{{(<><>)[<>()]}<<<>{}><<>()>>})>{[[<(<>[])[[]{}]>{{[]<>}<[]
+<[{<<(<([{<[<{()<>}<{}[]>>([<>()]{<>()})]{[([][])<{}<>>][<<><>>]}>}][[[<{{[]{}}[[][]]}([{}[]]<[]<>
+<{[(<<[({([{<[{}[]]{<>{}}>}[(({}()){[]<>])]]{{<<[]>([]<>)><<{}()>{<>[]}>}{({<><>}<<>{}>){(()[])<()<>>}}})
+[{<{[(({[[<<<<<>()>{(){}}>[{[]{}}(<><>)]>{[<[][]>(()<>)]<<[]()><()()>>}>])}(<{<[<<{}[]>>{[()[]]({}{})}]>{
+[<{<[[[<{[<<[{<>{}}<(){}>]{<{}{}><{}{}>}>{<(()<>){<><>}>}><[<{{}()}>{{<>()}{()<>}}]({<{}<>>}[{()<>}[()()]])
+(([(<({[<<({{<()()]{[]{}}}[{<>()}[[]()]]}({[<><>]}<[<>{}][()<>]>)){{[[[]<>]<<><>>](({}{}){{}()})}}>>]})>)<((
+(<<({((<<(<{([()]<()[]>)}[{(()<>)(()())}{{()<>}<()()>}]>)({[<(<>())((){})><{<><>}[{}<>]>][[[<>
+[(<([{[[[{{{([()()]([]()))[<[][]>[<><>]]}{(<[]>[(){}]){[<>{}]{{}()}}}>[<<[[][]][{}()]>[<<>{}>
+{<{[[[{<<([({[<><>][(){}]}({(){}}[{}<>]))<{[(){}][<>{}]}{(()()){{}[]}}>]{[((()[])<()[]>)<<(){}>{{
+[<[{{{({([({<<(){}>[{}<>]><{{}<>}[<><>]>}[[<(){}>([]{})]<{(){}}[{}[]]>])[<({<>{}}<{}<>>)({<><>})>]]){(<(({
+<<{[[{[[(<[{[[{}()][()[]]](<[]{}>(<>))}(([{}()])<[{}()](<>())))]><(<[[<>{}](<>())][[<>()][()]]>{<<<><>>[()[
+<<([<[{{[[({[{()}[{}<>]]({{}{}}{<><>})}<{{{}()}<()[]>}<<{}{}><[][]>>>)<{([[]<>]<{}()>)][([{}()
+[(<<[[{<<{<[[<()[]>({}<>)]<{[]<>}<{}<>>>]{<<()<>>[[]{}]>([{}()]{()()})}>[<{((){})[{}()]}[([]{})<()[
+[<<(<{[{{[<{(([])({}())){<<>>{()[]}}}{[(<><>)[[]()]]{<<><>><()<>>]}><((<<>()>{<>{}})){[{()()}][[()[]]([]{})
+((<[({<[(({[{(()())<(){}>}<[[]<>]{()()}>]({<()<>>(<>())})}<(<[[][]]{<>[]}><<[]<>>[{}[]]>)<{([]{})[{}()]}([[]
+[([{<[{(<<({[<{}()>([][])]{({}<>){{}[]}}}[<((){}){<>{}})[{(){}}]])({([{}<>]{<>{}})})>[<<{<{}<>><[
+[{{{[<({({{{[<{}()><[][]>]({{}{}}([]))}{<[<>{}]{{}{}>><{{}<>}>}}}[[[([{}()](()()))][({<>{}}{<>{}}){
+[<{[{{(<{[<[(<()()>{()[]}){{{}{}}(<><>)}]<<({}{}){{}()}>{([])(<><>)}>>[({{[]{}}})<{(<><>){(){}}}((()<
+<[<<[<(([<[{(<[][]>(<>[]}){{{}<>}[{}()]}}]<[[<{}{}>{()()}][[<>()]]]([<()>(()[])])>>][{[((<[
+[{({<[[{<<[<[(<>{})<[]{}>]<<[]{}>[<><>]>>{({()<>}[<><>])}]><{{{{[]()}{<>[]}}<((){})>}({<(){}>[
+{[<([[<(((<{<{[]<>}<[][]>>}>)))[<<{[([[]<>]([][]))(({}<>)<<><>>)]<{{{}{}}<<><>>}([()<>](()()>)>}>>]>{({<{
+{{{{(([<(<{({(()())([][])}{({}()){[]{}}})}({(((){})[{}[]])}{((<><>){<><>}>[<{}[]>{<>[]}]})><[{<(<>[
+<[<[<(<<<{(([[(){}]({}<>)]){<[()<>]{()()}>[[{}{}](<>)]})((((()<>)({}<>])[[{}<>][<><>]])(<<{}{}>(()()
+[[{(([<{<[[({{{}{}}<[]<>>}{([]){<>()}})[(<[]()>(<><>)){<<>()>{()[]}}]]]>(<[[{(()<>)[[]{}]}(([]())(()
+{<<(<<([(<(<({[]{}}{[]<>})>({([]<>)<[]{}>})){{([(){}]([]<>)){[[]()]}}}>{<{((()](<>()))}[(<{}<>>((){})
+[({{{{{(<{({[{<>())(()())][<[]<>><[][]>]}{<[<><>][()()]>[<()()>([]{})]})<[[([][])<[]()>]<([][])<()<>>>]
+[[[<([<[<(<{(([]<>)<{}<>>)<[{}[]]<()[]>>}{{([]()){()[]}}([{}{}](()()))}><{{<()<>><()()>}{<{}<>}{<>()}}}{{[[
+(<({({[[(<[{<{(){}}[{}{}]><{()()}>}[([<>()]({}<>)){<{}()>({}[])}]]>)[[(([(<>[])<()<>>]){[<
+({<[<{<<{{{({[()[]]})({[()()]{{}()}}(([]<>)<<>[]>))}}}>>(([({<[{[]}[[]()]][[<>[]]([]<>)]>({[<>()]{
+{{(<[{({<[{{[{{}()}(<>{})]{[()[]]([]{})}}{([[]()][[]])[[[]()][()[]]}}}[<[<{}()>[{}[]]]>({<[]()>([
+<(([(([[[[(([({}{}){()<>}]<{()[]}([]<>)]))]][{[({{<>()}<{}<>>})([[<>()]])](<[<<>()>]({()<>}{[]{}})>{[(()
+([<{[<<<(<[{(<{}<>>[<>()])[<(){}>]}[[[()[]][()<>]]<<[]{}><<>()>>]]<[<{{}<>}{()<>}>{{[]()}})(<<<><>>>{
+[{({{<(((({(<{(){}}>((())(()<>)))((<{}{}>((){}))<[[]]((){})>)})(<(([[]{}]<<><>>)<{()[]>(<>())>)>))))>}{{{({
+[{(<<{{(<[{({{{}{}}{<><>}})}(<{({}<>)[<>{}]}<[{}{}]{{}{}}>>)]>([[{(<[][])<[]<>>)<(()<>)[[][]]>}[({()<>
+<[([[((([{<[{(<>{}){<>()}}(({}[]])]([([]())<<>[]>])>[{<[{}<>](<>[])>}<[[(){}][{}()]]{{{}<>}[{}[]]}>]}])))][{(
+(<[[(({({{[<<[<>[]][<>{}]>[[<>{}]((){})]><<<{}<>>[<>{}]><{[]{}}[()<>]>>]([[[<>{}]{()()}]<<()<
+[{{{{<<{{{{<({<>()}((){}))(<[][]>{[][]})>{<(()<>)[()<>]><<{}{}>{{}[]}>}}<[[<{}{}>]{[<>()]<<><>>}]{<(()())<{}
+([(<<{[{(<{<(<{}{}><{}<>>)[(<>[]){(){}}]>({<[]()>(<>{})}<{[]{}}[(){}]>)}>([[<<[]()>(<>)>(<<>[
+<(<<{<{[{[<[{<()<>>([][])}]>]}]}><<<[([{(({}{})(()()))({()()}<<>>)}([(<>{})(<>[])][({}<>)[[]<>
+<([[((<[<[[((<{}<>><{}()>)<(<>{})<[]<>>>)[<{()}({}())>{[[]{}]{()[]}}]]<<[(()[])(<>())]{<[]<>>
+<<{{{<<({{<[<[<>()]{{}<>}>{<()<>>{[]{}}}]>}}{({[<[()[]][<>{}]>((()[])<{}()>)]}([{[[]{}]<[]<>>}{([]
+(({[(<({<{[[{<<><>>({}[])}(<<><>>[[]{}]))(<{<>{}}[[]{}]>[[<>{}]({}{})])][<[<()[]><()<>>]><[({}[])[<>()]]<([](
+([([[([(<{[<([<>{}][(){}]){<<>()><()<>>}>{[{()<>}[[][]]][[{}{}]<(){}>]}]([<[[]()]{{}[]}>[{<>[]}[[](
+({((<[(<(({{([{}[]](<>()))[({}())]}[{[<>{}]<<>()>}{[{}]}]}({{<[][])[{}[]]}}((<<>{}><<>{}>))))<[<{[(){}][{
+{([<{{(({[(<<{<>{}}[<><>]>{(<>[])({}())}>{((()[])[{}]){([][])((){})}})][<[<<[]()>{(){}}>]((<{}()>[{}()])<<{
+{{<<(<[<(((({{{}<>}{[]<>}}[(<><>){[]()}]))[<{([]<>)<[]()>}([[]{}]<()>)>{{[<>[]]({}<>)}{<<>[]>[<><>
+[<({{[{{[(<[[<[][]>{<>{}}][{{}[]}[(){}]]]>{{(<{}[]>(<>()))<((){})>}[{([])}]}){[<[{()<>}<[][]>][[
+({<{{{(({({<(<{}[]>[[]<>])>})}<{(([{<>{}}<<>()>](([]<>){()[]}))([({}{}]{{}{}}][{()[]}{()()}]
+((((<({[[<(<{(()[])((){})}>(([{}()]<<><>>)[{()[]]{{}}]))[[{(<>()){<><>}}{<<>[]>[[]<>]}][[{
+({<[<((<({<<((<><>)(<>[]))[{[]{}}{[]{}}]>{[[()()]{()()}]{[<>{}]}}><({[[][]][()<>]})>}([[[(
+({<(<<<<<(<[<[<>()](()>>][<<<>()>[{}[]]><(<><>)>]><({<<>{}>}[<<><>>{(){}}])[{{<>{}}<[]<>>}]>)(<{{{()()}
+[<<[{[<{([([{<()()>[{}[]]}<<()[]>{()()}>][<<{}>[[]<>]>{[()[]][[]()]}]){[((()<>)<{}[]>){[[]()][{
+[{[<{<{(({{<(({}[]))[[{}[]]{[][]}]>}}<([{(()[])}<[[]()]>]{<<<>()>[<>[]>>[[[]()][[][]]]})>){<<[<<{}()>(()
+<(({{<{{<[{(<[[]<>]><({}{}){[]{}}>){{[[]{}]({}<>)}<((){})<<><>>>}}{[(([]<>)[{}<>])({<><>})]<(<()<>>{(
+[[{[(<(<<[(<[[<>[]]((){})]{[<><>]<{}[]>}>)<[{{()[]>(<>{})}(({}[]){{}[]})]<<[{}{}]>{[{}{}]}>>][{([<()<>>({}
+[({<({[[<[{<<{{}[]}<(){}>><[[]()][{}{}]>><{([])([])}[({}<>){()()}]>}{[{<{}{}>[<>()]}]({({}[
+{{<[<[(([<{[{{[]{}}[[]{}]}]}>[[(<{[]()}(()())><{(){}}(<>())>)[<([]()){{}<>}>[<[]<>>{{}[]}]]](((({}
+{(<<[(({{[[{([[][]]{{}()})([()<>][{}{}])}]([[{[]<>}({}{}]][<{}[]>]](({{}[]}){<{}[]>((){})}))][<((
+{{{{({{({[{{([{}[]]<(){}>)<<[]()>([]<>)>>{[{{}()}]<[{}]<()()>>}}[[{<[][]>{[]{}}}({()[]}<[]()>)][<[{
+[{{[[({[[[[((<{}[]><{}[]>){[{}{}]{()[]}})({{(){}}([])}<<[]()>[{}{}]>)]}{{{({[]}({}))<((){}){{}<>}>}{{
+[<{([{(<{(((([()<>]<()<>>)[[<>()]([]{})])[(({}()))<<<>()><[]>>])[<{{<>{}}[()()]}(<[][]>{()()}
+({(({{<[{<{((<{}{}>{{}[]})<{{}()}{{}()}>)[[({}()){[]<>}]{<()>[{}<>]}]}><{[[(<>{})<[][]>]<{{}<>}{{
+(({{(({(<[[{[<<>{}>{[]()}][{[]{}]{(){}}]}(((()[]){{}{}})<(()())>)]([<[{}[]]>])][<{{[{}[]]<<><>>}{[[
+((<[[<<<[([<[<<><>>([][])](<[][]>{<><>})>((({}<>)((){})))>[[<[<><>]<{}<>>><({}[])([]{})>]])[{[{({}<>)[()[]
+[<((({{({(({<(()())<{}[]>>(<[]{}>({}{}))}))[<<[({}[])[{}[]]]<{{}{}}{[]}>>>]}[(<({<{}()>[<>()]}[<[]()>((){
+[[([(((<{[[[<[{}()}({}<>)>]]{<{{<><>}({}())}{{<><>}([]{})}>}]}[([{[{[][]}(()<>)]{{<>{}}[<>(
+<<([<{{<{<<(<([]<>)><(<><>){{}{}}>)<(<()<>>([]<>)){(<>{}><<>>}>>{(((()[]){{}[]})[[[][]][{}[]]])({([
+[<[{<[<<(([{({[]{}}([][]))<[()<>]{{}<>}>}]<<[<{}>[<>{}]][([]<>)(<>[])]>[{((){})(()())}<[{}()]{<>()}>]>){([
+[[[{[(({<<{{{((){})({})}{[<>()]([]<>)}}{[<<>{}>[{}[]]][[{}<>][()<>]]}}>{<{{([]{}){{}[]}}<{<>{
+{{{<{[[<[{[<[<<>()>{{}()}][[<>{}][[]<>]]>]<{<{(){}}({}{})><(<>())[{}()]>)<{[()()]}[<()<>>(<>)]>>}
+(([[<{(([<[((<(){}>[{}()]){([]{})[<>{}]})[[[<><>](<>[])]((()()))]][{{<()[]><<>{}>}}]>])<({[[({()<>}[<>{}])]]
+{{({[({[[<(((({}[])(()()))))(<<<{}()>[{}]>>(<[<>[]]{[]()}>{({}<>)([][])}))>]{({{<(<><>)>[{
+<<((({[([[{<<{<>{}}[[][]]><{()()}<{}<>>>>}[[[<<>()>([]())]({<><>}{{}[]})]<{<{}<>>[[]()]}{{(){}
+<[{(([<(<{{[[{{}()}([]<>)](<{}()>{[]{}})]}<[[<()[]>(()())]{([]{})[<>{}]}]<<{[][]}><<<>()>>>>
+<([(([{([([(<[{}[]][[]()]>(<{}[]>[<><>]))<<{{}()}<<>[]>>>])[[<[{<>()}[()()]]<[{}()]((){})>>]{[{(()[])<(
+((<([<[[{[{{[(<><>)<[]()>][(<><>)[<>{}]]}}<(([{}()]{<><>})<([])[()()]>)>]{(({[()[])[[]()]}[(<>)])[<{{}
+{<{<<{{[{<(([{(){}}<<>[]>]<{{}{}}{()[]}>)[<[[]{}><<><>>><[<>()]>])>{(<({{}{}}{<>{}})[<<>[]>]>)((<{
+[<<<(({{{[(<{([][])[{}<>]}<(()[])(()())>>[{{<>{}}({})}[<<>>[<>]]]){([{()()}[()[]]]{[()[]]<<>>
+<{{{<(<<{([[(<{}()>(<>{}))]](({[[][]]}({[]<>}{[]<>}))<([{}{}][[]])[<[]()><{}<>>]>))[<<<<()><[][]>>{(()())<[]
+{{[[{[[{{{[{([<>[]][<>[]>)[({}[]){{}{}}]}[(((){})[()])(({}[])[<>])]]}<[<{<[]{}>({}<>)}{[{}[]]((){}
+{([<([([{(((([()[]][[]<>])[<[]()><()>])({({}{})<[][]>}[([]<>){[]<>}])))<<{[[{}{}]][{(){}}{[]()}
+<<[(([{<((<[({<>{}})[(()){[][]}]]>))>}]<({((([{([][])({}<>)}<<()()>([]())>])){{{{[{}{}]<<>[]>}{(()[])
+[[{<([[{<{((({<>{}}[{}{}])([[]()]{{}[]}))({<[][]><<>{}>})){<(<<><>>({}<>))<([]){<>{}}>>(<<<
+([({<<{<(<((<(<>{})({})><[[][]](()())>)([[{}{}]([]())][<()[]>[{}[]]])){<[<{}{}]{<>()}][([]{}){<><>}]>}>)>{[[(
+{<(([<([(([(({[]<>}[{}<>])[(()<>){()[]}])<<{[][]}>({<>[]}{[]<>})>]{{{<(){}><()()>}({[]{}}{{}[]}))([([]())
+{[<([[{[({[<{{(){}}}{(()[])<()[]>}>]<<<{()[]}><{{}()}([]{})>>{{<<>()><<>[]>>{{<>[]}{<><>}}}>
+(<(<{[{[([[[([<><>])][({[]{}}({}[]))]]])[<[{({{}<>}([]()))(<{}><()()>)}(<<{}<>><<>()>)<<{}
+(<[(({{<[{({{<()[]>}{{<>}<<>[]]}}{[{<><>}[{}<>]]((<>))})([[[<>{}]]<([])>])}{<({<[]<>><<>()>}[({}())[<>
+{[({([(<{[[[<<<>[]>(()<>)>]<(([]{})[[][]])(<[]()><{}<>>)>](({{<><>}<()<>>}{[{}{}]([]<>)})[<{<>}[[]{}]
diff --git a/2021/src/bin/day10.rs b/2021/src/bin/day10.rs
new file mode 100644
index 0000000..87ae894
--- /dev/null
+++ b/2021/src/bin/day10.rs
@@ -0,0 +1,130 @@
+#![feature(test)]
+extern crate test;
+
+use aoc2021::common::*;
+
+const DAY: usize = 10;
+type Parsed<'a> = Vec<&'a str>;
+
+fn parse_input(raw: &str) -> Parsed {
+    raw.lines().collect()
+}
+
+fn solve(parsed: &Parsed) -> (usize, usize) {
+    let mut points = 0;
+    let mut p2_points = Vec::new();
+    for &line in parsed {
+        let mut stack = Vec::new();
+        let mut invalid = false;
+        for c in line.bytes() {
+            match c {
+                b'(' | b'[' | b'<' | b'{' => stack.push(c),
+                b')' if stack.last() == Some(&b'(') => {
+                    stack.pop();
+                }
+                b']' if stack.last() == Some(&b'[') => {
+                    stack.pop();
+                }
+                b'>' if stack.last() == Some(&b'<') => {
+                    stack.pop();
+                }
+                b'}' if stack.last() == Some(&b'{') => {
+                    stack.pop();
+                }
+                b')' => {
+                    points += 3;
+                    invalid = true;
+                    break;
+                }
+                b']' => {
+                    points += 57;
+                    invalid = true;
+                    break;
+                }
+                b'}' => {
+                    points += 1197;
+                    invalid = true;
+                    break;
+                }
+                b'>' => {
+                    points += 25137;
+                    invalid = true;
+                    break;
+                }
+                _ => unreachable!(),
+            }
+        }
+        if invalid {
+            continue;
+        }
+        p2_points.push(autocomplete_points(stack));
+    }
+    let p2_len = p2_points.len();
+    (points, *p2_points.select_nth_unstable(p2_len / 2).1)
+}
+
+fn autocomplete_points(stack: Vec<u8>) -> usize {
+    let mut points = 0;
+    for p in stack.into_iter().rev() {
+        points *= 5;
+        match p {
+            b'(' => points += 1,
+            b'[' => points += 2,
+            b'{' => points += 3,
+            b'<' => points += 4,
+            _ => unreachable!(),
+        }
+    }
+    points
+}
+
+fn main() {
+    let raw = read_file(DAY);
+    let input = parse_input(&raw);
+    let (p1, p2) = solve(&input);
+    println!("Part 1: {p1}");
+    println!("Part 2: {p2}");
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use aoc2021::*;
+
+    const TEST_INPUT: &str = "[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]";
+
+    #[test]
+    fn test_autocomplete_points() {
+        assert_eq!(autocomplete_points(vec![b'<', b'{', b'(', b'[']), 294);
+    }
+
+    #[test]
+    fn part1_test() {
+        let input = parse_input(TEST_INPUT);
+        assert_eq!(solve(&input).0, 26397);
+    }
+
+    #[test]
+    fn part2_test() {
+        let input = parse_input(TEST_INPUT);
+        assert_eq!(solve(&input).1, 288957);
+    }
+
+    #[bench]
+    fn bench_solution(b: &mut test::Bencher) {
+        let raw = read_file(DAY);
+        let input = parse_input(&raw);
+        b.iter(|| assert_eq!(solve(test::black_box(&input)), (358737, 4329504793)))
+    }
+
+    bench_input!(Vec::len => 90);
+}