4 files changed, 177 insertions, 0 deletions

diff --git a/2021/day10/Cargo.toml b/2021/day10/Cargo.toml
new file mode 100644
index 0000000..40d2066
--- /dev/null
+++ b/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]
diff --git a/2021/day10/input b/2021/day10/input
new file mode 100644
index 0000000..a529340
--- /dev/null
+++ b/2021/day10/input
@@ -0,0 +1,94 @@
+{[<<([{((((<[<[]{}><[]{}>]<<{}{}><[]<>>>><<([]<>)>[({}[])({}[])]>))([[({[]{}})<{{}{}}(())>][[{
+({[{({[<<<<<<(()())>>{{([]{}){{}[]}}{<(){}><<>[]>}}>{(<[[][]]{<><>}><<{}<>>{<>{}}>)}>>>]<[{<{<{[(){}]<()()>
+[{[{{{[<({<((<()()>[{}()])({<>[]}{[]()}))>[{{[[]()]<{}()>}[<[]<>>{<>{}}]}{[<{}<>>{<>()}][(()<>)[
+{([<(<{{([[{(((){})[<>[]])<[[]{}][{}<>]>}{[{<>{}}]{<[]()><()[]>}}]])}({[<{(<()<>>)({{}()}[
+<[{({{(({<[{{(<>()){[]{}}}[{[]{}}]}<{{{}{}}<{}()>}{<<><>>({}())}>](<{{[]()}[{}[]]}((()<>>([]<>)
+({[{[[[{{{{[<({}())[[]()]>({<><>}(<>()))]<((()())<{}<>>){{<><>}(()())}>}{<({[][]}<[]()>){{{}()}
+{((<<<<(([(((({}()))[[()()]{{}{}}])(<{{}}{()<>}>((<>[]){{}<>})))({<({}())[<>[]]>[{[]<>}]}[<[{}{}]<
+(({([{{{{([<{<{}[]>({}{})}[{<>{}>([]{})]>][(((()())<()[]>)(<(){}>[{}{}]))(({{}{}}({}()))({{}(
+{([<{{{{({{{([(){}])}[<<[]<>>([][])>({[]<>}{[]()})]}}{{[{(<>[]){(){}}}({[]()}{{}{}})]{{{{}()}([]<>)}}}{{
+(<<(<<{[<{((({[])<[]{}>){[[][]]}))[[<<<>{}>>][({{}()})([()[]]<[]<>>)]]}(({<[()()]{()[]}>([<>{
+({<[({[<{[{(<<()[]>(<><>)>{([][]){()<>}})[(<(){}><{}[]>)(<[]{}>[<>[]])]}]<(<[(()[])[{}[]]]>{[[(){}]([]
+<<<{{<([([<(<<{}{}>[<>[]]>(<{}()>[[][]])){<<<>{}>([]())>(([]{}){[]})}><{{{{}[]}<()()>}(<{}<>>{[]<>}
+<[[{{<(<[{[{{({}[]){()()}}((()())<()<>>)}][[{(<>[])(<><>)}(<()[]>{{}<>})]]}[{<<<{}<>>><{{}<>}[{}{}]>><
+[<{([<[<<<<[({<>[]}{()}){[(){}]{()[]}}]><[[[[][]]{<><>}]]<<{()<>}{<>{}}>(<()()>[{}()])>>)<<{{<<>
+[([(({([({{<<{<><>}>({{}{}}{(){}}))<[<{}{}>(()<>)]<<[]>>>}}{({<<{}<>>{[]()}>{[{}[]]{()[]}}
+{{<<(({{[[<({{(){}}}[<<>{}>{[][]}])<{<{}<>><{}{}>}{(<><>)((){})}>>{[{(<>[])([]{})}{<{}[]>}]}]<<[<((){})(<
+<{(<<([<[{<{{{()[]}<<>{}>}(({}<>)(<>()))}{{((){})([]<>)}<{()<>}[<>[]]>}>{[<{{}<>}>(<<>[]>[{}
+<{({(<{<<{(([(<>[]){<><>}]({[]{}}(()[]))))([[{{}()}{{}<>}][[[]()]{()}]])}(<[<<[]()>(<>{})){{{}()}<<>()>}
+<<([{((<({<[<({}[])({}[])>]<{[[]<>]<()[]>}[<{}<>>(()<>)]>>[[<[<>()]<()>>{(<><>]{[]<>}}][{<()<>>{[]<>}}
+[{<[<(<[(<{<({{}{}}[{}[]])><{(()<>){[]()}}{{[]()}[()()]}>}>[[[<({}[])>{<()<>>[<><>>}]]])]>(<{<<[<(
+[[(<<<{{[[<<<[[]<>][[]<>]>{{<>{}}}><<{[][]}{()}>>>]]}[([{<<[{}{}]<{}<>>>>[(<()[]>{()()})]}]([[(<
+<<<[<<[<[{<(({{}{}}<[]{}>){[{}{}]{{}{}}}}{<(<><>)[{}{}]>{[(){}][()<>]}}><(<{<>{}}(<>{})>{<{}<
+[({<[<(((<({[[{}{}](()[])]<<[][]}>}<{{[]{}}([]())}{(<>())<{}[]>}>)>))({<[<{(<>{})[<><>]}(<(){}
+<(({[<[<{{{<[[<>{}]]{((){}){<>[]}}>(([{}<>][{}<>])[[[]()]<()()>])}(<[<[]{}>{<>{}}]><<(<>()){<>()}>([()[]]{<>(
+<<<([(<(<(<[<{<><>}<()[]>>(((){})((){}))]<({()[]}({}<>)){<[]<>><<>()>>>>[<[[<><>]([]<>)]>[(({}{})<()
+(([[(<{[([({[[{}()]{[]{}}][{{}<>}<{}<>>]})([[[<><>]<<>>]][([[][]])])][<<[[()<>]{<>{}}]<[{}()](()())>>{[(
+[{{<<{<({({[(<<><>><<>[]>){[[]{}](()())}][((<><>){<>[]})(({}<>){[]()})]}<(({[]()})(<[]()><{}[]>))(<
+{(<{<[<[<[<[[<()[]>(<>{})]{(<>{})<<><>>}]>[({[<><>]})[<<{}<>>{<>{}}>]]]<[[<{{}()}(<>[])>]]<{{<()[]
+{[{((<<<<[<{({()<>})}>{<(({}<>)){{()()}{{}{}}}>[<[{}()][<>()]>[[<>{}]{[]()}]]}]({{[<<>{}>(<>[])
+(([[<<({{{[<<([]{}){(){}}>[({}<>)<{}<>>])(({[][]}){{<>{}}[[]()]})]}}})([((((({[]()}[()<>]))
+<<<{<<[[{({([{()()}(())])<<{[]<>}<()[]>><<()[]>[{}<>]>>})}<[[{([<>[]>(()())){([]{})<()[]>}}<[<(){
+{<{{{<[([[{[<(<>)<<><>>>{<<>{}>({}[])}](({()<>}({}))[(<>[])])}]<{[[<{}>(<>[])]{[[][]][<>[]]]]{((<><>)[(){
+<({({<<(({([[[()[]]{<><>}]{[[]<>]}]{[<<><>>[(){}]]({()[]){{}{}})})}<{<[[[][]]<<>{}>](({}<>)(()<>))>
+{{{[(((<{{(<({{}[]})><([{}{}])<([][])[<>[]]>>)<{[(()<>)[<>[]]]{[{}[]]<[]()>}}>)}{<<[<<[]{}>[{
+[({<{(([<<([([[]()]<{}[]>)<{{}()}<<>[]>>]{[{{}}<[]>]{{[][]}(<>())}})[[{<[]{}>{()<>}}<(<>{})(<>{})>][
+{<(<{[{[{(((<{{}[]}{[]()}>)[{{<>[]}{<>[]}}((()[])<<>()>)]))(({[{<><>}<[]{}>][{[]()}]}<<{<>}[<>()]>(<[][]>{[]{
+{{{([[{<<[{[{[[]()]{{}{}}}([{}]{()[]})][<<[][]>(<>{})>]}]{[<<[<>())(<><>)>[{<>{}}{[]<>}]>]
+{[<{{<[[<[[(<([][]){()}>[{{}<>}[[]<>]])<((<><>){<>{}})([<>{}]{{}[]})>](<[{()<>}[<>{}]]>{<<[]
+[<(((({[{((<{<{}{}><(){}>}][<(()<>)<[]{}>>(<()[]>[{}{}])]){[[[[]()]([]<>)]][<(()[])<<><>>><{[]<>}>]}
+({(<<(({{[{<<{{}()}{()<>}>({[][]}{<>{}})>}]([{{{[]{}}<{}()>}[(()[])({}())]><{[{}<>]<()<>>}[
+({(<<[({({<[<[()()]>{({}()){{}{}}}]>[<{(()<>)<{}{}>}{<{}{}>[<>[]]}]((<[]<>>)[[[]()]<<>[]>])]})[[[[[[
+{<(<<[[[<{({{{[][]}{()}}[{{}<>}{[]<>}]}<([[]{}]{[]()})[(()<>)([][])]>)}>]]]>>[<{[<{[<[([{}{}]([]<>))[[
+{<({{<{<(<[{[[{}()](<>{})]<{<>()}{<>[]}>}{{[{}{}]}<<{}{}>({}[])>}]({[{()()}[()[]]]}[<{()()}{{}{}}>[<()[]
+{[[{(([({([([{<>()}[<>{}]])]<<[((){})({}<>)]><[[[]<>](<>[])][<()>[[]()]]>>)})])<[{<[<<<[[]]>{<<><
+{<[[<[<<{[{<({[][]}[(){}]){<()<>>[{}<>]}><([[]{}][()[]])[<()()><()[]>]>}({[{[][]}][[{}{}]]}[[{(){}}<<>[]>
+({(<{[[{<<<(([{}()]<(){}>)[[{}<>]<<>[]>]){<{[]<>}(()<>)>}><{({[][]}(())){<()()>(<><>)}}>>([<([{}[]][<>()
+<{<(([(<({[<{((){})<{}()>}[[[]<>]{[]()}]>({({}[])<(){}>})]{[{[()]{{}[]}}<[{}()][[]{}]>]}})>)[<<([({<
+[(({{{(<{{{[<<[]()><[]<>>>{((){})}]}{{{<()<>><[][]>}}}}{[<(<[]<>>[{}[]])[{()()]]><[([]())[{}[]]]({{}[]}(()[
+[[(<<<{{<{<<([<>()]{{}{}})[[<><>][<>[]]]>>[[([<>[]][[]{}])({[]{}})]<[<{}{}>[()<>]]>]}{(<[{{}[]}{
+{{{(<[(<{(<[{{<>()}{[]<>}}]>)<[{([[]()]<{}<>>)[{<><>}([]<>)])(<{()}(()<>)>([{}<>](<>[])))]<[<<<>><<><>
+<[[(([(<<[{[<<()[]><<>()>>{[{}[]][()[]]}]{[<()[]>{()<>}](<()()><{}[]>)}}{({[[]](()<>]}({[][
+<[<{{<([<{<{[{[]}({}<>)][(<>())]}<<[()[]](()[])>{<{}()>[()[]]}>>(<{((){})[{}()]}>((((){})((){
+([<{<{[<[[<<{(<>[])}[<<>[]>{[][]}]>>]<({<(()())([]())>(({}<>)<[]()>)}{({(){}}([]{}))[{<><>}<<><
+{{(([({({{<(({{}()}{[]{}})<([]{})>)>[[[[{}<>]](((){})[()<>])][(({}{})({}[]))<[[][]]<<>{}>>]]}))}){{<
+[{{<{{<<{({{<[{}[]][[]()]>[<<><>><{}{}>]}{[<()[]><[][]>]({{}()}(<>{}))}}<<([<><>][[]<>]){(<>}(<>())}
+{[<({<[[[[{<{<<>{}><<><>>}{[<><>]({}<>)}>((((){})[{}<>])[{()<>}{{}[]}])}({(<[]()><{}()>)}{(
+[((((({{<[{({[{}[]]{{}()}}{(<>())[[]<>]})}(<{<()[]><[]{}>}>{<[[]()]<(){}>><{[]}{[][]}>})][<{((
+{[(((([[[([{<{()[]}(()[])>((()<>)[<><>])}]([([{}()][[]()])[{{}<>}{(){}}]]({({}{})<{}{}>}<{{}[]}<{}<>>>)
+[(<([{{[(<({{[<>]<()<>>}{[[]{}][[]{}]}}]>)]}}<{(([[{({[]()}({}[]))<[()<>]{(){}}>}]{({(<>[]
+(<([([<([<{{{{<><>}<()()>}{({}()]<[]<>>}}}>]([({<((){}){{}[]}>}([{()()}{<>{}}]<{[]<>}{(){}}>)){{[<[](
+[{<({{([(<[(<{{}()}{<>()}>((<>())<<>()>))<<[{}[]]><({}())[<><>]>>]<{{[{}{}]{[]()}}<(()<>}<()[]>>}<<({}()
+[<<(([<{<{[[{{[]<>}{{}()}}<[<>()]<<><>>>]({({}())(())}([{}{}]<{}()>))]{<((<><>){<><>}){(()())}>}}({{([
+{{{([{{[<{(<{<<>{}><<>()>}<{()<>}{<>[]}>>)[[<[<>{}]<{}{}>><{()[]}>][(({}())([]{}))[[{}[]][{}()>]]]}[
+({<(({<<(<<[{<<>{}>{<><>}}((())<{}[]>)]><{((<>{})<<>()>)}>))>(<[<[{[<>{}][[]()]}[({}{}){<>()
+[{{<[<<({([{{{()[]}(<><>)}([<><>]<<><>>)}[({<>{}}((){}))]][[(<<>{}>[{}()])<([]())([]()>>]{
+({([<[((([{([<()()>[()<>]])(<{[][]}<{}[]>><[()<>]{<>[]}>)}({[{<>{}}{[]{}}][([][])]}[{{<><>}}<[{}{
+{[{(<[[[{<([({{}()}(<>[]))<[[]<>][[]<>]>][<(<><>)<<>{}>><[[]{}]{<>{}}>])(([<[][]>{{}()}]<{
+{<<(<<{<<([{[<{}[]><{}[]>]{{{}{}}{[]()}}}(<[[]{}][[]<>]><[()()]>)]){(([(<><>)([][])](<{}()>)){([<>{}](<>
+(([[{{[[{{{<{{<>[]}{()[]}}(<()<>})>({[[]()]{[]()}}<(<>())>)}[[([{}](()[]))<<<>{}>{<>{}}>]{{({}<>
+[<([(<<{({<[<[(){}]{(){}}><<{}[]>(<>())>]>({([<><>]({}<>)){([])[{}[]]}}[[<[]><{}>]])}){<{<<{[]<>}[{}[]]>>}{((
+((<<({({({[[[<{}[]>{[][]}]<{[][]}[<>{}]>]{[([]{}><[]{}>]}]((<{()[]}[<>[]]>{(<>[]){()<>}}))}[[[
+(((<<{{([{{(([[]<>]<[][]>)({[]{}}[()<>]))[<({}{})<[]{}>>{{{}()}[()<>)}]}}[{<{<(){}>[()]}{(<>{}){()[]}}>
+([([<<<[[[[<{{[]()}}[[<>()][[]()]]>{({{}{}}<[]()>)}]]][({([({}{})[{}<>]])[{<[]>{()()}}{(()[])
+{[<(({((<{([{(<>[])}]{{{<>}[[][]]}((())<[]{}>)})}>[{([[<{}<>>([]{})]))[{<{{}<>}[()[]]><{[][]}
+<[[<{[<[{{{[<(()())}([[][]]<<>{}>)]{<{[]}<{}[]>><[{}{}](<>{})>}}}}({(<(([]()){[]()})><{({}<
+[(({({[(<({(((()[])))})>[[{(([[]()](()<>)){{{}<>}<{}()>}){[<(){}><[]()>]<({}<>)[()()>>}}[[<<()()>{()[]}>
+{<[({([[(({[{[<>{}]{<>{}}}{[<>()]}][<[{}[]]<()<>>>{<{}()><{}{}>})}(<{[<><>][<><>]}>([(<>{})<{}()>
+[{<{<{{([[[[[([])({})](([]()){<>{}})]<[{{}{}}[{}{}]][<()()>(<>{})]>]]]([([<[{}[]]<()>>[({}[])(<>())]](
+<(<{({{((<<[({[][]}[<><>])]><<{[{}]<[]<>>}[<[]<>>]>([{{}[]}({}<>)][[[][]]{[]()}])>>((([{(){}}[(){}]])({<()<>
+<{(<<(<({[<{([{}]{[]{}})[<()[]><{}[]>]}>(([({}[])]<(()<>)[()()]>)<[{[]()}<<>()>](<(){}>[{}{}])>)]}<{({[{[]<>}
+[(({([({[<[{({[][]}<()()>)<(<>{})[{}()]>}{<{{}<>}<{}[]>>([<>()](<>))}]>[[((<[]>[[]<>]){({}())((){})})][([[(
+({[[(<<{{{<[[[()<>]{{}<>}]{<()[]>({}())}]<[[{}[]]{<>{}}][[<>{}]{[][]}]>>}}}]>[<{{<{[[<<>[]>({}{
+((<[{[{{[<<{<{{}<>}<()<>>>[<{}<>>(()())]}(<<{}()><[]()>>(<{}{}>{(){}}))>([({<><>}<{}()))[{[
+([{{[{[{[(([[(()[])[<><>]](<{}()>([]<>))]))(({[{()}]<(<>[]){()<>]>}[({()[]}[{}()])]))]}][<(<{<<[[]<>]<(){}
+{{<{([{<[([<{(<>[])<{}{}>}[{(){}}(<>())]>[(<{}<>>[{}<>])((<><>)[()[]])]]<(({{}{}}<{}[]>)<[{}
+{{{{({<[{({{[[<>{}][[][]]]<<()<>>{[]}>}})]]>}){[<[<({((<{}[]>({}()))((()<>)))((<[]<>>))})>[([{[<{}()>(<>{})]<
+{(((((({((([{((){})([]<>)}(<{}{}>(<>()))]<<{<>[]}<<>()>>>){{<([]())[{}{}]>[(()())<(){}>]}<<{{
+{[[{<{(([{[[{(()[]){[][]}}(<()<>){{}()})]]}<(<([(){}])[[{}[]]{<>()}]>){{<[[]()]>(([]<>)[[]<>])}{(<{}<>>[(){}
+<<[<{<[[({(<<(()()){{}{}}>>[{<(){}>({}())}{<{}()>[[]<>]}])[{{({}<>)<<>()>}<{{}()}<{}<>>>}[{[{}{}]
+([([{{[[([<[[<<>{}>[[]()]]{[[]<>]<[]<>>}]({[<><>][<>{}]}{[[]()]{<><>}})}<(<<<>[]>{{}()}>{<()[]>
+[[[[([<<{[{({[{}<>][{}<>]}([()[]]<[][]>))(<([])>)}{{({<><>}[{}()])(<<>()><[]()>)}{((<>[])<
+[(<[([<<({[<<({}[])(()[])><{<>()}{{}<>}>>(<{[]<>}{{}[]}>{[()()]<[][]>})][[{<{}[]>(()[]>}<<{}[]
+[{[<<({([{<[({[][]})]>{({{()<>}{{}[]}}[(<><>){[][]}])}>]<[<<<<[]()>(()[])>{[[]()]([]<>)}>>(<
+<[(({<[({<[{{{()()}<<>[]}}({<>[]}<[]<>>)}]{[<<[]()><()()>>[({}<>){[]{}}]][<<()()>[<>]>{{()<>}}]}>})]>}))({
diff --git a/2021/day10/input.example b/2021/day10/input.example
new file mode 100644
index 0000000..b1518d9
--- /dev/null
+++ b/2021/day10/input.example
@@ -0,0 +1,10 @@
+[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]
diff --git a/2021/day10/src/main.rs b/2021/day10/src/main.rs
new file mode 100644
index 0000000..dcb44a8
--- /dev/null
+++ b/2021/day10/src/main.rs
@@ -0,0 +1,65 @@
+use std::collections::HashMap;
+use std::env;
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+
+fn main() {
+    let reader = open_file();
+    let points = HashMap::from([(')', 3), (']', 57), ('}', 1197), ('>', 25137)]);
+    let comp_points = HashMap::from([(')', 1), (']', 2), ('}', 3), ('>', 4)]);
+    let pairs = HashMap::from([('(', ')'), ('[', ']'), ('{', '}'), ('<', '>')]);
+    let opening = vec!['(', '[', '{', '<'];
+    let closing = vec![')', ']', '}', '>'];
+    let mut final_scores = Vec::new();
+
+    let mut score = 0;
+
+    for line in reader.lines() {
+        let mut stack: Vec<char> = Vec::new();
+        let mut flag = false;
+        if let Ok(ln) = line {
+            for char in ln.chars() {
+                if opening.contains(&char) {
+                    stack.push(char);
+                } else if closing.contains(&char) {
+                    let t = stack.pop().unwrap();
+                    if char == *pairs.get(&t).unwrap() {
+                    } else {
+                        score += points.get(&char).unwrap();
+                        flag = true;
+                        break;
+                    }
+                }
+            }
+            if !flag {
+                let mut score: u64 = 0;
+                stack.reverse();
+                for c in &stack {
+                    score *= 5;
+                    score += comp_points.get(pairs.get(c).unwrap()).unwrap();
+                }
+                final_scores.push(score);
+            }
+        }
+    }
+
+    final_scores.sort_unstable();
+    let idx = final_scores.len() / 2;
+
+    println!("part 1: {}", score);
+    println!("part 2: {}", final_scores[idx]);
+}
+
+fn open_file() -> BufReader<File> {
+    let args: Vec<String> = env::args().collect();
+
+    if args.len() != 2 {
+        eprintln!("Usage: {} <filename>", args[0]);
+        std::process::exit(1);
+    }
+
+    let filename = &args[1];
+
+    let file = File::open(filename).unwrap_or_else(|_| panic!("No such file: {}", filename));
+    BufReader::new(file)
+}