From 92bf39eabf48265ea38b13064ea799d41196bda0 Mon Sep 17 00:00:00 2001
From: Justin Wernick <justin@worthe-it.co.za>
Date: Fri, 10 Dec 2021 22:31:54 +0200
Subject: Day 10

---
 inputs/day_10.txt |  94 +++++++++++++++++++++++++++++++++++++++++
 src/bin/day_10.rs | 124 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 218 insertions(+)
 create mode 100644 inputs/day_10.txt
 create mode 100644 src/bin/day_10.rs

diff --git a/inputs/day_10.txt b/inputs/day_10.txt
new file mode 100644
index 0000000..661c46a
--- /dev/null
+++ b/inputs/day_10.txt
@@ -0,0 +1,94 @@
+{[<([<[[(<[({<<><>><()[]>}<(()())(())>)<(([]())){<()()><{}<>)}>][(((()<>)[{}{}]){<[]<>>({}{})})]>)[(({([{}[]]
+{{[[(<[[[<[<<{()()}(<>{})>[<<><>>[[]]]>[{{[]<>}[[]]}<<[]{}>[<>[]]>]]([[[{}<>]]<<()[]>{()<>}>]([<<
+([<{[[{{((([(<[]<>>{[]<>})<([]){<>{}}>][([<>[]][[]{}])])[[{{()[]}<()[]>}<{(){}}>]]]<{(<[{}<
+(({(<{(([<[({([]())(<>())}{([]{})[{}{}]})]{(({{}()}{<>()}](<[]<>>(()[])))({[[]{}]<[]<>>})}>[[[{<<>[]>(()
+[([<([{({{[{[([]{})[{}[]]][[{}{})]}<([<>{}]<<>()>)>]}([<{[()<>]{()<>}}[[{}{}]<(){}>]><{{{}[]}[()<>]}[{{
+<(([<{{<(<[(<{()()}>(({}()){()[]}))<[<[]()>[[]()]]<{[]()}<<>{}>>>](<[([]())]>(([()()][()<>])({()<>}<[]<>>))
+[{({<(<[{({{{[()[]](<>[])}{([]{})<<>{}>}}}{{<<{}[]>(<>)><(<><>)([]())>}<{({}<>)(<><>)}{[{}{}
+([(<{<[<{[({[<[]{}><<><>>]<({}[])({}<>)>}([{{}<>}<[]()>]<<<><>>>)){({<<><>>[[]{}]}(<()<>>{()}))<{<[
+({{([(<{{{{{{([]{}){<>{}}}}{<<()>{{}{}}>[({}())(()<>)]}}[[[[{}{}](<><>)]{<()[]><[][]>}](([[]](()()))<[[]
+(<<[<{{{({{<{{(){}}{<>()}}<({}{}){[][]}>>[{<[]{}>{<>()}}<{[]<>}[()<>]>]}}({([({}[])(<>{})][{<>}])[{[()<>]<{}
+{[(<<((<[[<{<{<>()}[{}[]]>}{{((){})[()<>]}<{(){})[{}{}]>}>]({((<<>()>){[<>()]{{}()}}){{[()()][<><>]}
+{(((([[(<[({({{}()}[<>[]])<(<><>)([]())>}{<[[]<>]><<()<>><()<>>>})<[[<[]{}><<>{}>]]>]<<{{[
+[{(<[[(<(<[{<({}[])<{}{}>>(<[]<>>)}]<{(<[]()>[()()])}>>{({<{{}()}[<>()]>})<[[(<>())(<>{})]{{{}[]}}][({{}[]}
+{[[<([{[(<<[<<()()>[[]]>[{()()}]](<[()]<()[]>><<{}()>{()()}>)>><[[([{}<>]{{}()})<{{}[]}<()[]>>]]})[([{{{<>()}
+((({[(<<{(((<<{}()>><{<><>}>)))[[{<({}[])[{}[]]>}(<[<><>][()()]><[[][]]<{}[]>>)]]}((({<(<>())>[({}{
+{<{{[(<<{(<{[({}<>)<{}[]>]([(){}](<>[]))}<(({}()){[][]}}[<()[]><{}()>]>>)}<<{(<[{}()]{<>{}}>[[[]()](()
+{(<<({{([<[<[<{}<>>{[][]}]<[<><>][()[]]>>{(({}{})){<()><()()>}}]>(<({{()()}({}<>)}<([]<>){[]{}}>){([[]<>
+<(<({{{([({{<<{}<>><()[]>>[{()<>}[<>{}]]}})({([{()[]}{(){}}]<(()<>)<{}<>>>)}<{{<{}<>>[[][]]}}<[{<>}[<>
+{({{(<<([({{[(()<>)[[]<>]][(<>{})({}())]}})]{(<[<(<>()){<><>}><<{}()>[[]]>][{{<>()}{[]()}}{[()<>]{<>()}}]>)
+([<({{{([[<<[[()[]][<><>]]<<<>[]><()()>>>(<{()<>}<()[]>><{<>()}<[]{}>>)>({(<()[]]<()()>)<[<>()][{}]>
+{[{<((<[<<({<{[]{}}[()()>>({[][]}[[]()])})(([{()}{{}()}]<<{}()>{{}{}}>)<([<>()])(<{}<>><{}[]>)>)>{[{
+{{([([{(<[[{[{()<>}({}())][[[]<>]<{}{}>]}]<<[({}[])(()<>)]({(){}}[()()])>{{(())<(){}>}}>]{[<{[[]()]{<>[]}}
+<(<({<{<<<([<([]<>)([]<>)>]<{{{}{}}<<>()>}>)<<{[[]()](<>{})}(([]())<[]()>)><[{<>{}}[(){}]]>>>>>(<{<[[[{
+(([({<{(<{[<({<><>}){{[][]}}>{<([]()){{}{}}>[([][])<{}{}>]}]}[((<{()<>}>)[{{()<>}{[][]}}])]
+(<<<(({{{([[<{(){}}>{(()())(()[])}]{({{}[]}<[][]>]<{{}<>}{()}>}])<(({[[][]]{{}{}}}(([][])<(){}>)
+{<{{[[({<<{{({{}()}({}{})><[()<>][<>{}]>}([<()[]>({}())][{()<>}[()]])}{<[{(){}}<[]{}>][[[]<>][[][]]]>([[<>]
+{{{[(<([[[[{[[(){}}<{}>]<{<>[]}{{}{}}>}]<[[(<>())((){})]((<>()))]{(<[]{}>([][])){<[]<>>(()[])}}>]
+(<{[([[<(<[<{[<>{}]}(<[]<>>{{}<>})>[{(())}]]>){<{(<(<>())<{}()>>]}({<<[]<>>[[]<>]>((()<>)[<><>])}
+[<{[[(({([((({[]{}}[()()])))]>[((<<[<><>][[]()]>{[()<>][()()]}>({{<>[]}({}<>)})))]})){((<[<[<[<>()]>
+<({[{{{<{[<[({[]{}}<[]>)(({}[])({}<>))]><{((()()))[[()<>]{<>[]}]}(<((){})<{}{}>><({}[])>)]][([<{
+<(<<<<<[(<<[{{[][]}{{}{}}}{{[][]}<()>}](<([]{})[()[]]>[[{}{}]{<>()}])>([{[[]()]<<>[]>}[<<>{}>{<>
+<(<[[<[[[<<(<(()[])<{}()>><(<>{})>)[([{}{}]([]{}))]><<<[<>[]]{<>[]}>{(()<>)({}[])}>>><[[[{<
+([[{[({<({(([<(){}><[]<>>]<{()<>}({})>))([([{}<>][{}[]]){[<>[]]({}<>)}][[({}[]){[]()}]])})>[({{(<(()[]){<>
+<[<{<[{(<<[[{{(){}}({}<>)}<(()[])>]<<<()()>(()<>)>({{}})>]({[(<>{})<{}()>]{<{}<>><<><>>}}<<{()<>}
+{[{({[[(({{{{<()()>{[]{}}}{[<>[]]<()<>>}}(<<<>()><{}<>>>({()<>}[()<>])}}{<{[()[]]{(){}}}>[<<[]{}>>[((){})<(
+{{(<[<(<(<{{(<[]()><()<>>)}{((<><>))[<<>{}>{()[]}]}}>{{<({{}{}}[()<>])[<(){}>(<>[])]><<(<>{}}[{}
+[{{{[[[[{(<{<[<>[]](()[])]{{<>{}}}}{[(()()){[][]}]{([][])}}><<{<<>()>([])}[[[]{}]<{}{}>]>(([{}<>]<[]()>)
+{[[(<([[[[((({<>{}}(<>())){<{}[]>})[([<>[]](<>[])}[({}[])([]())]])([<{{}()}(<>())><[[][]][<>()]>][([()()]<<>[
+<[{[{({(<(((<<<>{}><[]()>][{{}()}{[][]}])[(((){})([][]))[[()<>][[]{}]]])[[(((){})[()])[[(){}]<{}
+[{[[<[<{{(({([(){}]<()()>](([]<>)[()[]])}<<{[][]}([][])>>)<[[([]())<{}[]>]]>){[[[{{}()}[<>[]]]{<[]{}>
+[[<([([[<<<{{[{}[]][<><>]}}{{{{}{}}}}>>>[([[(<<>[]>({}<>))<([]())<<><>>>]{{<<>[]>{<>()}}}][<{{[
+({[<<<((<<<<<<[]{}>[()()]>{[()[]]{()<>}}>[((<>()){()()}){<[][]]<{}{}>}]>{{[[{}{}]<{}[]>]([[]<>])}((
+({<<[[{{<{[[{<()><<>>}<<()[]>([][])>]]([[({}<>)[()[]]](([]{})<<>[]])]<[([]<>){[]}]>)}(((<<{}[
+<(<(<(([([[[{{[]()}{<>()}}{<{}[]>[{}()]}]{{[{}{}]<()[]>}({<>()}<(){}>)}][[{<{}()><[][]>}](<[
+[[<{<[<[<({<<{[]}<()<>>>({<><>}{[]<>})><([<>()]([][]))>}[({[{}{}]<{}[]>})({[<><>]})])>]([[{<({
+<([{[[<<[({<<[{}()]({}[])>{<[][]>{()()}}>{<(<>[])([]{})>([{}[]}[<>])}}{{[<<>[]>{[]<>}][([][]){{}{}}]
+[([({((<[{{{[<{}><<>()>]<<()[]>>}<[{{}{}}([][])]{{()<>}<(){}>}>}<{<[[][]]>({{}<>}{()[]})}>
+[[[{([({{{<{[[[][]]{()()}]}{{<<>[]>[{}[]]}[[[]()]<<>>]}>({{(<>[])[{}[]]}({<>()}[{}[]])}{{(()<
+{<{{{<[{[<{(<{[]{}}{[][]}>{{[]<>}}}}[{((()[])<()()>)[<<>[]><{}()>]}<[{<>{}}[()<>]]<[<>[]][<>{}]>>]>[<[
+<[<{[[<{<[([{({}[])(()<>)}[[<>()]{()[]}]])][[<{[<>[]][<>[]]}<{<>{}}{<>{}}>>{<<()()><()<>>>{([]()
+<[{{({<[<([[[([]{})({}())]]<[{{}}[()<>]]<{<>{}}{()}>>])<[<[<<>()>]{<{}{}>[[]<>]}><({[]()}<<><>>)[(()<>)(<>())
+{<[[[<(<[<{<({<>{}}[<><>])([{}<>]<[][]>)><<[(){}](<>[])>[({}[])<<>[]}]>}{{{(<>())(<>{})}}<((<>())
+<{(<<[{[{<{<<((){})[[]{}]><([]<>)<{}[]>>>{[[[][]]<()()>]}}{({{<>()}<<>()>}{<{}<>><()[]>})}>}<[<([<()()>{()()
+{{([<{[[((<<{<<>()><<>[]>}<(()<>)>>><<[<[][]><{}<>>]>{<([]()){[]<>}>}>))]<{(((<[[]<>]([]<>)>[{{}()}<<
+([{{({{<[[(((<[][]>{<>{}}){<()[]>{[]()}})(<({}<>)([]<>)>(([])[()<>])))(([([][]){()<>}]{{[]<>}{[](
+[{{<{({[<{<{((<>())({}[]))<{<>()}({}[])>}(<[{}()]<{}<>>>({[][]}{()<>}))}{([({}[]){{}[]}]<([][])>)}}{<{({{}(
+[{(([[[([<<(<([]()){<>}>(({}<>)(()())))[((<>{})){[()<>]<<>{}>}]>>][<{{[<()<>>{{}[]}]<<{}[]><{}[]>]}[
+{<<<(<[<[{<[<({}[])>(([])<[]<>>)]<<<{}{}>({}())>{[<>{}}<[][]>}>>[{[<<>()><()()>]{[<>[]]<[]>}}[<<<>[]>{[]()
+([(((<<(<[[<[<{}<>>(<><>)]>([<{}[]>{<>{}}]({<>{}}[()()]))]](<({<<>[]>({}[])}<[[]<>]{<>[]}>)(<{
+([{({{{[(((<<{[]()}<{}<>>>((<><>){[]()>)>({<{}()><(){}>}<[<>()]>))){((([[][]]{<>{}})[([]<>){<>[]}]
+<(({{{[(([<[{<(){}>([]<>)}(<[]><()<>>)]><<([()[]]([]()))>{[(()<>}<{}>]}>]){{[{(({}{})<(){}>){[[]]{[]
+[<{(<({<{((<<<[]<>>([]())>(((){})[[]()])>{[[<>]<{}<>>]}){[<[<>[]]({}())]{{()[]}<()>}]})<([[([]())<<
+[[<<[<{{[{({<[()<>]{<>[]}>{([][]){<><>}}}<[[{}()]][<<><>>{{}[]}]>)}{<{{({}<>)(()())}[{{}{}}[{}()]]
+({<({[{[{(([<<()()>{<>[]}>[([]<>)<()<>>]]{<{<>()}[{}{}]>((<>{}){<>{}})})([<([][])[[]{}]>(<[]()>{<>
+{[[((<{[[<<({<[]<>>[()<>]}{[()]{<>}})>[<{<<>()><()[]>}{{()[]}<()<>>}>(([{}[]]))]>[[{({<><>})}
+{{(<[{{[{<[({(()){{}<>}}(<{}[]>[[]()]))]>}({(<((()[])((){}))<{<><>}[<>()]>>)}(<<[(())<{}<>>]{[[]]<{}
+<{{([<<<<[([<[<><>][[]]><<(){}>[()()]>]<{(<><>)<<><>>}([{}{}])>)][[([<()()><<>()>])(({[]<>}([]{}]){<[]><[]
+{(<<[[<{{((([<[]<>>[{}<>]][([][]){{}{}}>)(<<<><>><[]{}>>{{(){}}[<>{}]}))({<(())[<>()]><{<>{}}(<>[])>}(({
+[[[([({([<<[[[<>{}]{<>{}}]<[<><>]{{}<>}>]>[({[()()]<<>()>}{[()()][{}()]}){({{}()}[(){}))}]>[(<{[()<>
+[{{(<<<[{(((<<()<>>([])>({<>{}}<()[]>)))[{(([]){()<>})(({}[])<{}})}<{([]{})({}())}<(<>[])<<>[]>>>
+{<<<<[{[{({{[<<>()><{}[]>]<[[]{}][{}{}]>}(<({}{})<()<>>>{{()<>}})}{[[{{}{}}[{}{}]]<[<><>](<>{})>]})(([{[<>()
+<(<[<{(<{[{<{[[]{}]{{}[]}}>[{[[]<>][{}{}]}(([]())(<>))]}<{{[{}{}]([]{})}[({}())]}{<<<>()>>([(
+<{{[{[<{[[<[{<[]{}><<>{}>}]{({()<>}(<><>)){[<>[]]}}>{([[<>{}]({}{})](({}{})<[]{}>))<{[{}<>
+{{<<{<<<[{[[([[]()][()()])(({}()))][[({}[])<()()>]]]{<[<{}[]>{{}{}}]>}}[[[[([]())]([<>[]][[]{}]>]]
+[[<<[({{{(<[(<()<>>[<>])]([(()<>){<>())]([<>[]][[]<>]))>{{[[[]()]([]())]{<[]{}>{()<>}}}[<([]<>)<()>>({<>{}}[<
+([[([<{<[<((<(<>[])(<>[])>(<<><>><{}[]>)){<<{}<>>>({{}{}}<()[]>)}>[{{(<><>)(()<>)}[<<>[]>]}]>]<{{
+{{{((<<{[[{<([[]{}][{}<>])>}<[((()())<()<>>)[[[]{}]{[][]}]]<<<[]{}>{{}[]}>(<<>()><(){}>)>>](<
+{(([[{{<[[<{(({}<>)[<>[]])}<{({}{}){{}}}[[()[]](()())]>>]([<[{()[]})({<>}[<>{}])>{[{{}{}}{(){}}]{<{}{}>}}])
+{([(<{<<({[<[{()()}<[]<>>]{<[]{}>}><[[<>][()<>]]>]{<{{[]{}}<(){}>}[({})]>{{<{}{}><()<>>}([{}
+{{[[({{({[(([{{}()}[{}]]({{}<>}([][]))){({{}<>}[[]{}])<<()<>>>})]{(<[<{}{}>{<>()}](({}())((){
+{<({{<<{{([{{{[]<>}{<>{}}}((<><>)<()<>>)}[<[{}<>][()[]]><[<>()][<><>]>]]{{[[()<>]<<>[]>]<(<><>)
+<(<[(<<[[<<<[({}())<[][]>](({}<>)[{}<>])>>[<{{{}}<()<>>}<(()<>){{}{}}>>]>({{<[<><>](<><>)>[(<>{}
+[((<{[{{(<{[({{}[]}((){}))([[][]]{<>[]})]<{<{}[]>[{}<>]}[<{}()><{}<>>]>]>)}}]}{{{(<[(<{{()()}}>{[<{}<>><<>[]>
+{([<<{(<([[({{{}<>}<(){}>}<<()[]>{<>{}}>)((<[][]>[<><>])<<[][]>{<>()}>)]((<{<>[]}{[][]}>[[<>()]{<>[]}]]{{[
+[<{(<{([{{(([<<>()>]{<(){}><()<>>}){(([]{}>)<(<><>)>})}({({[<>]{<>[]}}[[{}<>]])}[{<[()[]]<{}<>
+{[(<(<{(<<[{[<[]()>(<>[])][{{}}[()[]]]}{{[[]{}]{()()}}<<<>>[[]()]>}]>{{<[<{}()>([]())]({(){}}(()<>))>([(<>(
+{{([[([[[<(({<{}<>>[<>[]]}{([]<>)<<>{}>})<{{[]<>}{{}<>}}([()()]<<>[]>>>){{[[()<>]]<((){})<[]{}>>}{<<[]<>><()
+<({([[[[[({[[{{}<>}({}<>)]({<>[]}[<>{}])][([<>[]](<>()))<([]())[{}{}]>]}(((({}[])[()[]])[{{}{}}(<>)])(<<<>
+[({{<{[([(((<{[]{}}{<>()}><[{}<>>{<>[]}>)){([<{}{}><()[]>]<([]{})[{}{}]>){{[[]]<[]{}>}((()[])[(
+(({<[<<{{[[<{(<>{})([]())}([[]{}]{{}()})><[<{}()><{}{}>]<<<>()>[[]()]>>]<[<<()[]><<>()>>[{{}<>}[<>]]]>]
+((<[[<{{{[({<(()[])<()<>>>})]{<(([()()][[]]))({[[]()]{[]<>}}{[<>()]})><<(({}[])[{}{}])>>}}}[[[{{{{[]{}}({}[
+([<[<{{{{[<<{{<>[]}([]<>)}><{{()[]}[<><>]}{<[]>[()<>]}>><{[{[][]}<()[]>]({[][]}(()<>))}<{(<>())(
+{((<(([[<[(<[{()[]}([]())>>[<[<>()]<[]{}>>(<()<>><[]>)])<(<{()}>(([]<>){<>{}}))<[[[]<>]{[]()}
+[(<[([([{{{<([[]<>]<<>>)[{<>[]}{{}<>}]}({(())[{}()]}[<{}<>>{<>()}])}([<[(){}]([][])><(()())
diff --git a/src/bin/day_10.rs b/src/bin/day_10.rs
new file mode 100644
index 0000000..a9a9f75
--- /dev/null
+++ b/src/bin/day_10.rs
@@ -0,0 +1,124 @@
+use nom::{
+    branch::alt, character::complete::char as nom_char, combinator::map, multi::many0, IResult,
+};
+use std::fs;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let input = fs::read_to_string("inputs/day_10.txt")?;
+
+    let mut syntax_error_score = 0;
+    let mut autocomplete_scores = Vec::new();
+    for line in input.split("\n") {
+        match parse_lisp(line) {
+            Ok(_) => {
+                // boring
+            }
+            Err(nom::Err::Failure(ParseError::MismatchedExpectation(_, actual))) => {
+                syntax_error_score += match actual {
+                    ')' => 3,
+                    ']' => 57,
+                    '}' => 1197,
+                    '>' => 25137,
+                    _ => 0,
+                }
+            }
+            Err(nom::Err::Failure(ParseError::EndOfInput(_))) => {
+                let mut line = line.to_owned();
+                let mut autocomplete_score = 0u64;
+                while let Err(nom::Err::Failure(ParseError::EndOfInput(expected))) =
+                    parse_lisp(&line)
+                {
+                    autocomplete_score *= 5;
+                    autocomplete_score += match expected {
+                        ')' => 1,
+                        ']' => 2,
+                        '}' => 3,
+                        '>' => 4,
+                        _ => 0,
+                    };
+                    line.push(expected);
+                }
+                autocomplete_scores.push(autocomplete_score);
+            }
+            Err(_) => panic!("Unexpected nom error type"),
+        }
+    }
+    dbg!(syntax_error_score);
+    autocomplete_scores.sort();
+    dbg!(autocomplete_scores[autocomplete_scores.len() / 2]);
+
+    Ok(())
+}
+
+#[derive(Debug)]
+enum ParseError<'a> {
+    MismatchedExpectation(char, char),
+    EndOfInput(char),
+    Other(nom::error::Error<&'a str>),
+}
+
+impl<'a> From<nom::error::Error<&'a str>> for ParseError<'a> {
+    fn from(e: nom::error::Error<&'a str>) -> Self {
+        ParseError::Other(e)
+    }
+}
+
+impl<'a> nom::error::ParseError<&'a str> for ParseError<'a> {
+    fn from_error_kind(input: &'a str, kind: nom::error::ErrorKind) -> Self {
+        nom::error::Error::from_error_kind(input, kind).into()
+    }
+
+    fn append(_input: &'a str, _kind: nom::error::ErrorKind, other: Self) -> Self {
+        other
+    }
+
+    fn from_char(input: &'a str, c: char) -> Self {
+        nom::error::Error::from_char(input, c).into()
+    }
+}
+
+#[derive(Debug)]
+struct Lisp {
+    blocks: Vec<Block>,
+}
+
+#[derive(Debug)]
+struct Block {
+    opening: char,
+    blocks: Vec<Block>,
+}
+
+fn parse_lisp(input: &str) -> IResult<&str, Lisp, ParseError> {
+    map(parse_blocks, |blocks| Lisp { blocks })(input)
+}
+
+fn parse_blocks(input: &str) -> IResult<&str, Vec<Block>, ParseError> {
+    many0(parse_block)(input)
+}
+
+fn parse_block(input: &str) -> IResult<&str, Block, ParseError> {
+    alt((
+        block('{', '}'),
+        block('[', ']'),
+        block('(', ')'),
+        block('<', '>'),
+    ))(input)
+}
+
+fn block(opening: char, closing: char) -> impl Fn(&str) -> IResult<&str, Block, ParseError> {
+    move |input: &str| {
+        let (input, _) = nom_char(opening)(input)?;
+        let (input, blocks) = parse_blocks(input)?;
+        let (input, _) = match nom_char(closing)(input) {
+            Ok((input, closing)) => (input, closing),
+            Err(nom::Err::Error(_)) => {
+                return Err(nom::Err::Failure(match input.chars().next() {
+                    Some(actual) => ParseError::MismatchedExpectation(closing, actual),
+                    None => ParseError::EndOfInput(closing),
+                }))
+            }
+            Err(e) => return Err(e),
+        };
+        Ok((input, Block { opening, blocks }))
+    }
+}
-- 
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