advent-of-code

Perserverance, or the lack thereof

git clone git://git.shimmy1996.com/advent-of-code.git
commit fe3669a04ddea58eaef3c57e676126c0f314561e
parent 6625751d3b1f1d8952e8028d19c689bcff96748c
Author: Shimmy Xu <shimmy.xu@shimmy1996.com>
Date:   Fri, 10 Dec 2021 22:49:47 -0600

Add 2021 day 10

Diffstat:
A2021/day10/input.txt | 94+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A2021/day10/main.rs | 90+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 184 insertions(+), 0 deletions(-)
diff --git a/2021/day10/input.txt b/2021/day10/input.txt
@@ -0,0 +1,94 @@
+{[<<([{((((<[<[]{}><[]{}>]<<{}{}><[]<>>>><<([]<>)>[({}[])({}[])]>))([[({[]{}})<{{}{}}(())>][[{
+({[{({[<<<<<<(()())>>{{([]{}){{}[]}}{<(){}><<>[]>}}>{(<[[][]]{<><>}><<{}<>>{<>{}}>)}>>>]<[{<{<{[(){}]<()()>
+[{[{{{[<({<((<()()>[{}()])({<>[]}{[]()}))>[{{[[]()]<{}()>}[<[]<>>{<>{}}]}{[<{}<>>{<>()}][(()<>)[
+{([<(<{{([[{(((){})[<>[]])<[[]{}][{}<>]>}{[{<>{}}]{<[]()><()[]>}}]])}({[<{(<()<>>)({{}()}[
+<[{({{(({<[{{(<>()){[]{}}}[{[]{}}]}<{{{}{}}<{}()>}{<<><>>({}())}>](<{{[]()}[{}[]]}((()<>>([]<>)
+({[{[[[{{{{[<({}())[[]()]>({<><>}(<>()))]<((()())<{}<>>){{<><>}(()())}>}{<({[][]}<[]()>){{{}()}
+{((<<<<(([(((({}()))[[()()]{{}{}}])(<{{}}{()<>}>((<>[]){{}<>})))({<({}())[<>[]]>[{[]<>}]}[<[{}{}]<
+(({([{{{{([<{<{}[]>({}{})}[{<>{}>([]{})]>][(((()())<()[]>)(<(){}>[{}{}]))(({{}{}}({}()))({{}(
+{([<{{{{({{{([(){}])}[<<[]<>>([][])>({[]<>}{[]()})]}}{{[{(<>[]){(){}}}({[]()}{{}{}})]{{{{}()}([]<>)}}}{{
+(<<(<<{[<{((({[])<[]{}>){[[][]]}))[[<<<>{}>>][({{}()})([()[]]<[]<>>)]]}(({<[()()]{()[]}>([<>{
+({<[({[<{[{(<<()[]>(<><>)>{([][]){()<>}})[(<(){}><{}[]>)(<[]{}>[<>[]])]}]<(<[(()[])[{}[]]]>{[[(){}]([]
+<<<{{<([([<(<<{}{}>[<>[]]>(<{}()>[[][]])){<<<>{}>([]())>(([]{}){[]})}><{{{{}[]}<()()>}(<{}<>>{[]<>}
+<[[{{<(<[{[{{({}[]){()()}}((()())<()<>>)}][[{(<>[])(<><>)}(<()[]>{{}<>})]]}[{<<<{}<>>><{{}<>}[{}{}]>><
+[<{([<[<<<<[({<>[]}{()}){[(){}]{()[]}}]><[[[[][]]{<><>}]]<<{()<>}{<>{}}>(<()()>[{}()])>>)<<{{<<>
+[([(({([({{<<{<><>}>({{}{}}{(){}}))<[<{}{}>(()<>)]<<[]>>>}}{({<<{}<>>{[]()}>{[{}[]]{()[]}}
+{{<<(({{[[<({{(){}}}[<<>{}>{[][]}])<{<{}<>><{}{}>}{(<><>)((){})}>>{[{(<>[])([]{})}{<{}[]>}]}]<<[<((){})(<
+<{(<<([<[{<{{{()[]}<<>{}>}(({}<>)(<>()))}{{((){})([]<>)}<{()<>}[<>[]]>}>{[<{{}<>}>(<<>[]>[{}
+<{({(<{<<{(([(<>[]){<><>}]({[]{}}(()[]))))([[{{}()}{{}<>}][[[]()]{()}]])}(<[<<[]()>(<>{})){{{}()}<<>()>}
+<<([{((<({<[<({}[])({}[])>]<{[[]<>]<()[]>}[<{}<>>(()<>)]>>[[<[<>()]<()>>{(<><>]{[]<>}}][{<()<>>{[]<>}}
+[{<[<(<[(<{<({{}{}}[{}[]])><{(()<>){[]()}}{{[]()}[()()]}>}>[[[<({}[])>{<()<>>[<><>>}]]])]>(<{<<[<(
+[[(<<<{{[[<<<[[]<>][[]<>]>{{<>{}}}><<{[][]}{()}>>>]]}[([{<<[{}{}]<{}<>>>>[(<()[]>{()()})]}]([[(<
+<<<[<<[<[{<(({{}{}}<[]{}>){[{}{}]{{}{}}}}{<(<><>)[{}{}]>{[(){}][()<>]}}><(<{<>{}}(<>{})>{<{}<
+[({<[<(((<({[[{}{}](()[])]<<[][]}>}<{{[]{}}([]())}{(<>())<{}[]>}>)>))({<[<{(<>{})[<><>]}(<(){}
+<(({[<[<{{{<[[<>{}]]{((){}){<>[]}}>(([{}<>][{}<>])[[[]()]<()()>])}(<[<[]{}>{<>{}}]><<(<>()){<>()}>([()[]]{<>(
+<<<([(<(<(<[<{<><>}<()[]>>(((){})((){}))]<({()[]}({}<>)){<[]<>><<>()>>>>[<[[<><>]([]<>)]>[(({}{})<()
+(([[(<{[([({[[{}()]{[]{}}][{{}<>}<{}<>>]})([[[<><>]<<>>]][([[][]])])][<<[[()<>]{<>{}}]<[{}()](()())>>{[(
+[{{<<{<({({[(<<><>><<>[]>){[[]{}](()())}][((<><>){<>[]})(({}<>){[]()})]}<(({[]()})(<[]()><{}[]>))(<
+{(<{<[<[<[<[[<()[]>(<>{})]{(<>{})<<><>>}]>[({[<><>]})[<<{}<>>{<>{}}>]]]<[[<{{}()}(<>[])>]]<{{<()[]
+{[{((<<<<[<{({()<>})}>{<(({}<>)){{()()}{{}{}}}>[<[{}()][<>()]>[[<>{}]{[]()}]]}]({{[<<>{}>(<>[])
+(([[<<({{{[<<([]{}){(){}}>[({}<>)<{}<>>])(({[][]}){{<>{}}[[]()]})]}}})([((((({[]()}[()<>]))
+<<<{<<[[{({([{()()}(())])<<{[]<>}<()[]>><<()[]>[{}<>]>>})}<[[{([<>[]>(()())){([]{})<()[]>}}<[<(){
+{<{{{<[([[{[<(<>)<<><>>>{<<>{}>({}[])}](({()<>}({}))[(<>[])])}]<{[[<{}>(<>[])]{[[][]][<>[]]]]{((<><>)[(){
+<({({<<(({([[[()[]]{<><>}]{[[]<>]}]{[<<><>>[(){}]]({()[]){{}{}})})}<{<[[[][]]<<>{}>](({}<>)(()<>))>
+{{{[(((<{{(<({{}[]})><([{}{}])<([][])[<>[]]>>)<{[(()<>)[<>[]]]{[{}[]]<[]()>}}>)}{<<[<<[]{}>[{
+[({<{(([<<([([[]()]<{}[]>)<{{}()}<<>[]>>]{[{{}}<[]>]{{[][]}(<>())}})[[{<[]{}>{()<>}}<(<>{})(<>{})>][
+{<(<{[{[{(((<{{}[]}{[]()}>)[{{<>[]}{<>[]}}((()[])<<>()>)]))(({[{<><>}<[]{}>][{[]()}]}<<{<>}[<>()]>(<[][]>{[]{
+{{{([[{<<[{[{[[]()]{{}{}}}([{}]{()[]})][<<[][]>(<>{})>]}]{[<<[<>())(<><>)>[{<>{}}{[]<>}]>]
+{[<{{<[[<[[(<([][]){()}>[{{}<>}[[]<>]])<((<><>){<>{}})([<>{}]{{}[]})>](<[{()<>}[<>{}]]>{<<[]
+[<(((({[{((<{<{}{}><(){}>}][<(()<>)<[]{}>>(<()[]>[{}{}])]){[[[[]()]([]<>)]][<(()[])<<><>>><{[]<>}>]}
+({(<<(({{[{<<{{}()}{()<>}>({[][]}{<>{}})>}]([{{{[]{}}<{}()>}[(()[])({}())]><{[{}<>]<()<>>}[
+({(<<[({({<[<[()()]>{({}()){{}{}}}]>[<{(()<>)<{}{}>}{<{}{}>[<>[]]}]((<[]<>>)[[[]()]<<>[]>])]})[[[[[[
+{<(<<[[[<{({{{[][]}{()}}[{{}<>}{[]<>}]}<([[]{}]{[]()})[(()<>)([][])]>)}>]]]>>[<{[<{[<[([{}{}]([]<>))[[
+{<({{<{<(<[{[[{}()](<>{})]<{<>()}{<>[]}>}{{[{}{}]}<<{}{}>({}[])>}]({[{()()}[()[]]]}[<{()()}{{}{}}>[<()[]
+{[[{(([({([([{<>()}[<>{}]])]<<[((){})({}<>)]><[[[]<>](<>[])][<()>[[]()]]>>)})])<[{<[<<<[[]]>{<<><
+{<[[<[<<{[{<({[][]}[(){}]){<()<>>[{}<>]}><([[]{}][()[]])[<()()><()[]>]>}({[{[][]}][[{}{}]]}[[{(){}}<<>[]>
+({(<{[[{<<<(([{}()]<(){}>)[[{}<>]<<>[]>]){<{[]<>}(()<>)>}><{({[][]}(())){<()()>(<><>)}}>>([<([{}[]][<>()
+<{<(([(<({[<{((){})<{}()>}[[[]<>]{[]()}]>({({}[])<(){}>})]{[{[()]{{}[]}}<[{}()][[]{}]>]}})>)[<<([({<
+[(({{{(<{{{[<<[]()><[]<>>>{((){})}]}{{{<()<>><[][]>}}}}{[<(<[]<>>[{}[]])[{()()]]><[([]())[{}[]]]({{}[]}(()[
+[[(<<<{{<{<<([<>()]{{}{}})[[<><>][<>[]]]>>[[([<>[]][[]{}])({[]{}})]<[<{}{}>[()<>]]>]}{(<[{{}[]}{
+{{{(<[(<{(<[{{<>()}{[]<>}}]>)<[{([[]()]<{}<>>)[{<><>}([]<>)])(<{()}(()<>)>([{}<>](<>[])))]<[<<<>><<><>
+<[[(([(<<[{[<<()[]><<>()>>{[{}[]][()[]]}]{[<()[]>{()<>}](<()()><{}[]>)}}{({[[]](()<>]}({[][
+<[<{{<([<{<{[{[]}({}<>)][(<>())]}<<[()[]](()[])>{<{}()>[()[]]}>>(<{((){})[{}()]}>((((){})((){
+([<{<{[<[[<<{(<>[])}[<<>[]>{[][]}]>>]<({<(()())([]())>(({}<>)<[]()>)}{({(){}}([]{}))[{<><>}<<><
+{{(([({({{<(({{}()}{[]{}})<([]{})>)>[[[[{}<>]](((){})[()<>])][(({}{})({}[]))<[[][]]<<>{}>>]]}))}){{<
+[{{<{{<<{({{<[{}[]][[]()]>[<<><>><{}{}>]}{[<()[]><[][]>]({{}()}(<>{}))}}<<([<><>][[]<>]){(<>}(<>())}
+{[<({<[[[[{<{<<>{}><<><>>}{[<><>]({}<>)}>((((){})[{}<>])[{()<>}{{}[]}])}({(<[]()><{}()>)}{(
+[((((({{<[{({[{}[]]{{}()}}{(<>())[[]<>]})}(<{<()[]><[]{}>}>{<[[]()]<(){}>><{[]}{[][]}>})][<{((
+{[(((([[[([{<{()[]}(()[])>((()<>)[<><>])}]([([{}()][[]()])[{{}<>}{(){}}]]({({}{})<{}{}>}<{{}[]}<{}<>>>)
+[(<([{{[(<({{[<>]<()<>>}{[[]{}][[]{}]}}]>)]}}<{(([[{({[]()}({}[]))<[()<>]{(){}}>}]{({(<>[]
+(<([([<([<{{{{<><>}<()()>}{({}()]<[]<>>}}}>]([({<((){}){{}[]}>}([{()()}{<>{}}]<{[]<>}{(){}}>)){{[<[](
+[{<({{([(<[(<{{}()}{<>()}>((<>())<<>()>))<<[{}[]]><({}())[<><>]>>]<{{[{}{}]{[]()}}<(()<>}<()[]>>}<<({}()
+[<<(([<{<{[[{{[]<>}{{}()}}<[<>()]<<><>>>]({({}())(())}([{}{}]<{}()>))]{<((<><>){<><>}){(()())}>}}({{([
+{{{([{{[<{(<{<<>{}><<>()>}<{()<>}{<>[]}>>)[[<[<>{}]<{}{}>><{()[]}>][(({}())([]{}))[[{}[]][{}()>]]]}[
+({<(({<<(<<[{<<>{}>{<><>}}((())<{}[]>)]><{((<>{})<<>()>)}>))>(<[<[{[<>{}][[]()]}[({}{}){<>()
+[{{<[<<({([{{{()[]}(<><>)}([<><>]<<><>>)}[({<>{}}((){}))]][[(<<>{}>[{}()])<([]())([]()>>]{
+({([<[((([{([<()()>[()<>]])(<{[][]}<{}[]>><[()<>]{<>[]}>)}({[{<>{}}{[]{}}][([][])]}[{{<><>}}<[{}{
+{[{(<[[[{<([({{}()}(<>[]))<[[]<>][[]<>]>][<(<><>)<<>{}>><[[]{}]{<>{}}>])(([<[][]>{{}()}]<{
+{<<(<<{<<([{[<{}[]><{}[]>]{{{}{}}{[]()}}}(<[[]{}][[]<>]><[()()]>)]){(([(<><>)([][])](<{}()>)){([<>{}](<>
+(([[{{[[{{{<{{<>[]}{()[]}}(<()<>})>({[[]()]{[]()}}<(<>())>)}[[([{}](()[]))<<<>{}>{<>{}}>]{{({}<>
+[<([(<<{({<[<[(){}]{(){}}><<{}[]>(<>())>]>({([<><>]({}<>)){([])[{}[]]}}[[<[]><{}>]])}){<{<<{[]<>}[{}[]]>>}{((
+((<<({({({[[[<{}[]>{[][]}]<{[][]}[<>{}]>]{[([]{}><[]{}>]}]((<{()[]}[<>[]]>{(<>[]){()<>}}))}[[[
+(((<<{{([{{(([[]<>]<[][]>)({[]{}}[()<>]))[<({}{})<[]{}>>{{{}()}[()<>)}]}}[{<{<(){}>[()]}{(<>{}){()[]}}>
+([([<<<[[[[<{{[]()}}[[<>()][[]()]]>{({{}{}}<[]()>)}]]][({([({}{})[{}<>]])[{<[]>{()()}}{(()[])
+{[<(({((<{([{(<>[])}]{{{<>}[[][]]}((())<[]{}>)})}>[{([[<{}<>>([]{})]))[{<{{}<>}[()[]]><{[][]}
+<[[<{[<[{{{[<(()())}([[][]]<<>{}>)]{<{[]}<{}[]>><[{}{}](<>{})>}}}}({(<(([]()){[]()})><{({}<
+[(({({[(<({(((()[])))})>[[{(([[]()](()<>)){{{}<>}<{}()>}){[<(){}><[]()>]<({}<>)[()()>>}}[[<<()()>{()[]}>
+{<[({([[(({[{[<>{}]{<>{}}}{[<>()]}][<[{}[]]<()<>>>{<{}()><{}{}>})}(<{[<><>][<><>]}>([(<>{})<{}()>
+[{<{<{{([[[[[([])({})](([]()){<>{}})]<[{{}{}}[{}{}]][<()()>(<>{})]>]]]([([<[{}[]]<()>>[({}[])(<>())]](
+<(<{({{((<<[({[][]}[<><>])]><<{[{}]<[]<>>}[<[]<>>]>([{{}[]}({}<>)][[[][]]{[]()}])>>((([{(){}}[(){}]])({<()<>
+<{(<<(<({[<{([{}]{[]{}})[<()[]><{}[]>]}>(([({}[])]<(()<>)[()()]>)<[{[]()}<<>()>](<(){}>[{}{}])>)]}<{({[{[]<>}
+[(({([({[<[{({[][]}<()()>)<(<>{})[{}()]>}{<{{}<>}<{}[]>>([<>()](<>))}]>[[((<[]>[[]<>]){({}())((){})})][([[(
+({[[(<<{{{<[[[()<>]{{}<>}]{<()[]>({}())}]<[[{}[]]{<>{}}][[<>{}]{[][]}]>>}}}]>[<{{<{[[<<>[]>({}{
+((<[{[{{[<<{<{{}<>}<()<>>>[<{}<>>(()())]}(<<{}()><[]()>>(<{}{}>{(){}}))>([({<><>}<{}()))[{[
+([{{[{[{[(([[(()[])[<><>]](<{}()>([]<>))]))(({[{()}]<(<>[]){()<>]>}[({()[]}[{}()])]))]}][<(<{<<[[]<>]<(){}
+{{<{([{<[([<{(<>[])<{}{}>}[{(){}}(<>())]>[(<{}<>>[{}<>])((<><>)[()[]])]]<(({{}{}}<{}[]>)<[{}
+{{{{({<[{({{[[<>{}][[][]]]<<()<>>{[]}>}})]]>}){[<[<({((<{}[]>({}()))((()<>)))((<[]<>>))})>[([{[<{}()>(<>{})]<
+{(((((({((([{((){})([]<>)}(<{}{}>(<>()))]<<{<>[]}<<>()>>>){{<([]())[{}{}]>[(()())<(){}>]}<<{{
+{[[{<{(([{[[{(()[]){[][]}}(<()<>){{}()})]]}<(<([(){}])[[{}[]]{<>()}]>){{<[[]()]>(([]<>)[[]<>])}{(<{}<>>[(){}
+<<[<{<[[({(<<(()()){{}{}}>>[{<(){}>({}())}{<{}()>[[]<>]}])[{{({}<>)<<>()>}<{{}()}<{}<>>>}[{[{}{}]
+([([{{[[([<[[<<>{}>[[]()]]{[[]<>]<[]<>>}]({[<><>][<>{}]}{[[]()]{<><>}})}<(<<<>[]>{{}()}>{<()[]>
+[[[[([<<{[{({[{}<>][{}<>]}([()[]]<[][]>))(<([])>)}{{({<><>}[{}()])(<<>()><[]()>)}{((<>[])<
+[(<[([<<({[<<({}[])(()[])><{<>()}{{}<>}>>(<{[]<>}{{}[]}>{[()()]<[][]>})][[{<{}[]>(()[]>}<<{}[]
+[{[<<({([{<[({[][]})]>{({{()<>}{{}[]}}[(<><>){[][]}])}>]<[<<<<[]()>(()[])>{[[]()]([]<>)}>>(<
+<[(({<[({<[{{{()()}<<>[]}}({<>[]}<[]<>>)}]{[<<[]()><()()>>[({}<>){[]{}}]][<<()()>[<>]>{{()<>}}]}>})]>}))({
diff --git a/2021/day10/main.rs b/2021/day10/main.rs
@@ -0,0 +1,90 @@
+fn main() {
+    let input = std::fs::read_to_string("input.txt")
+        .unwrap()
+        .trim()
+        .split('\n')
+        .map(|s| s.to_string())
+        .collect::<Vec<_>>();
+    // 311895
+    println!("Part 1: {}", part_1(&input));
+    // 2904180541
+    println!("Part 2: {}", part_2(&input));
+}
+
+enum MatchResult {
+    Pair,
+    Stack,
+    Illegal(u64),
+}
+
+fn check_match(a: Option<&char>, b: char) -> MatchResult {
+    match (a, b) {
+        (Some('('), ')') | (Some('['), ']') | (Some('{'), '}') | (Some('<'), '>') => {
+            MatchResult::Pair
+        }
+        (None | Some('(' | '[' | '{' | '<'), '(' | '[' | '{' | '<') => MatchResult::Stack,
+        _ => MatchResult::Illegal(match b {
+            ')' => 3,
+            ']' => 57,
+            '}' => 1197,
+            '>' => 25137,
+            _ => unreachable!(),
+        }),
+    }
+}
+
+fn part_1(input: &Vec<String>) -> u64 {
+    let mut tot_score = 0;
+    for line in input {
+        let mut stack = std::collections::VecDeque::<char>::new();
+        for ch in line.chars() {
+            match check_match(stack.back(), ch) {
+                MatchResult::Pair => {
+                    stack.pop_back();
+                }
+                MatchResult::Stack => {
+                    stack.push_back(ch);
+                }
+                MatchResult::Illegal(score) => {
+                    tot_score += score;
+                    break;
+                }
+            }
+        }
+    }
+    tot_score
+}
+
+fn part_2(input: &Vec<String>) -> u64 {
+    let mut scores = Vec::<u64>::new();
+    'next_line: for line in input {
+        let mut stack = std::collections::VecDeque::<char>::new();
+        for ch in line.chars() {
+            match check_match(stack.back(), ch) {
+                MatchResult::Pair => {
+                    stack.pop_back();
+                }
+                MatchResult::Stack => {
+                    stack.push_back(ch);
+                }
+                MatchResult::Illegal(_) => {
+                    continue 'next_line;
+                }
+            }
+        }
+        let mut score = 0;
+        for ch in stack.iter().rev() {
+            score = score * 5
+                + match ch {
+                    '(' => 1,
+                    '[' => 2,
+                    '{' => 3,
+                    '<' => 4,
+                    _ => unreachable!(),
+                };
+        }
+        scores.push(score);
+    }
+    scores.sort();
+    scores[scores.len() / 2]
+}