Added Solution for 2021 day 10

2021/day10_syntax_scoring/Cargo.toml

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+[package]
+name = "day10_syntax_scoring"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

2021/day10_syntax_scoring/challenge.txt

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+You ask the submarine to determine the best route out of the deep-sea cave, but it only replies:
+
+```
+Syntax error in navigation subsystem on line: all of them
+```
+
+*All of them?!* The damage is worse than you thought. You bring up a copy of the navigation subsystem (your puzzle input).
+
+The navigation subsystem syntax is made of several lines containing *chunks*. There are one or more chunks on each line, and chunks contain zero or more other chunks. Adjacent chunks are not separated by any delimiter; if one chunk stops, the next chunk (if any) can immediately start. Every chunk must *open* and *close* with one of four legal pairs of matching characters:
+
+* If a chunk opens with `(`, it must close with `)`.
+* If a chunk opens with `[`, it must close with `]`.
+* If a chunk opens with `{`, it must close with `}`.
+* If a chunk opens with `<`, it must close with `>`.
+
+So, `()` is a legal chunk that contains no other chunks, as is `[]`. More complex but valid chunks include `([])`, `{()()()}`, `<([{}])>`, `[<>({}){}[([])<>]]`, and even `(((((((((())))))))))`.
+
+Some lines are *incomplete*, but others are *corrupted*. Find and discard the corrupted lines first.
+
+A corrupted line is one where a chunk *closes with the wrong character* - that is, where the characters it opens and closes with do not form one of the four legal pairs listed above.
+
+Examples of corrupted chunks include `(]`, `{()()()>`, `(((()))}`, and `<([]){()}[{}])`. Such a chunk can appear anywhere within a line, and its presence causes the whole line to be considered corrupted.
+
+For example, consider the following navigation subsystem:
+
+```
+[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]
+
+```
+
+Some of the lines aren't corrupted, just incomplete; you can ignore these lines for now. The remaining five lines are corrupted:
+
+* `{([(<{}[<>[]}>{[]{[(<()>` - Expected `]`, but found `}` instead.
+* `[[<[([]))<([[{}[[()]]]` - Expected `]`, but found `)` instead.
+* `[{[{({}]{}}([{[{{{}}([]` - Expected `)`, but found `]` instead.
+* `[<(<(<(<{}))><([]([]()` - Expected `>`, but found `)` instead.
+* `<{([([[(<>()){}]>(<<{{` - Expected `]`, but found `>` instead.
+
+Stop at the first incorrect closing character on each corrupted line.
+
+Did you know that syntax checkers actually have contests to see who can get the high score for syntax errors in a file? It's true! To calculate the syntax error score for a line, take the *first illegal character* on the line and look it up in the following table:
+
+* `)`: `3` points.
+* `]`: `57` points.
+* `}`: `1197` points.
+* `>`: `25137` points.
+
+In the above example, an illegal `)` was found twice (`2*3 = *6*` points), an illegal `]` was found once (`*57*` points), an illegal `}` was found once (`*1197*` points), and an illegal `>` was found once (`*25137*` points). So, the total syntax error score for this file is `6+57+1197+25137 = *26397*` points!
+
+Find the first illegal character in each corrupted line of the navigation subsystem. *What is the total syntax error score for those errors?*
+
+To begin, [get your puzzle input](10/input).
+
+Answer:

2021/day10_syntax_scoring/src/lib.rs

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+use core::fmt::Display;
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum ParseError {
+    InvalidChar(char),
+}
+
+impl Display for ParseError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::InvalidChar(c) => write!(f, "Encountered invalid Character: {c}"),
+        }
+    }
+}
+
+#[derive(PartialEq)]
+enum Bracket {
+    Round,
+    Square,
+    Curly,
+    Angle,
+}
+
+impl Bracket {
+    fn from(c: char) -> Self {
+        match c {
+            '(' | ')' => Self::Round,
+            '[' | ']' => Self::Square,
+            '{' | '}' => Self::Curly,
+            '<' | '>' => Self::Angle,
+            _ => panic!("Tried to cast Unexpected character {c} into Bracket."),
+        }
+    }
+
+    fn corrupt_score(&self) -> usize {
+        match self {
+            Self::Round => 3,
+            Self::Square => 57,
+            Self::Curly => 1197,
+            Self::Angle => 25137,
+        }
+    }
+
+    fn incomplete_score(&self) -> usize {
+        match self {
+            Self::Round => 1,
+            Self::Square => 2,
+            Self::Curly => 3,
+            Self::Angle => 4,
+        }
+    }
+}
+
+pub fn run(input: &str) -> Result<(usize, usize), ParseError> {
+    let first = input.lines().map(|line| corrupted_score(line)).sum::<Result<usize, ParseError>>()?;
+    let mut incomplete: Vec<_> = input.lines().map(|line| incomplete_score(line)).filter(|score| *score != Ok(0)).collect::<Result<Vec<_>, ParseError>>()?;
+    incomplete.sort();
+    let second = incomplete[incomplete.len()/2];
+    Ok((first, second))
+}
+
+fn corrupted_score(line: &str) -> Result<usize, ParseError> {
+    let mut to_close = Vec::new();
+
+    for c in line.chars() {
+        match c {
+            o if is_opening(o) => to_close.push(Bracket::from(o)),
+            c if is_closing(c) => {
+                let c = Bracket::from(c);
+                if let Some(o) = to_close.pop() {
+                    if o != c {
+                        return Ok(c.corrupt_score());
+                    }
+                } else {
+                    return Ok(c.corrupt_score());
+                }
+            },
+            e => return Err(ParseError::InvalidChar(e)),
+        }
+    }
+    Ok(0)
+}
+
+fn incomplete_score(line: &str) -> Result<usize, ParseError> {
+    let mut to_close = Vec::new();
+
+    for c in line.chars() {
+        match c {
+            o if is_opening(o) => to_close.push(Bracket::from(o)),
+            c if is_closing(c) => {
+                let c = Bracket::from(c);
+                if let Some(o) = to_close.pop() {
+                    if o != c {
+                        return Ok(0);
+                    }
+                } else {
+                    return Ok(0);
+                }
+            },
+            e => return Err(ParseError::InvalidChar(e)),
+        }
+    }
+    let mut score = 0;
+    while let Some(o) = to_close.pop() {
+        score *= 5;
+        score += o.incomplete_score();
+    }
+    Ok(score)
+}
+
+fn is_opening(c: char) -> bool {
+    ['(', '[', '{', '<'].contains(&c)
+}
+
+fn is_closing(c: char) -> bool {
+    [')', ']', '}', '>'].contains(&c)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::fs::read_to_string;
+
+    fn read_file(name: &str) -> String {
+        read_to_string(name).expect(&format!("Unable to read file: {name}")[..]).trim().to_string()
+    }
+
+    #[test]
+    fn test_sample() {
+        let sample_input = read_file("tests/sample_input");
+        assert_eq!(run(&sample_input), Ok((26397, 288957)));
+    }
+
+    #[test]
+    fn test_challenge() {
+        let challenge_input = read_file("tests/challenge_input");
+        assert_eq!(run(&challenge_input), Ok((392367, 2192104158)));
+    }
+}

2021/day10_syntax_scoring/tests/challenge_input

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+{[[<{(<{[{{[{[[]{}]{<>{}}}({<>()}{{}{}})]}{({[<>{}]({}[])})[{[{}[]](()<>)}<[{}{}]{()<>}>]}}]<(({{{(){}}{[][]
+<<<({((<{<([([<>{}]<{}<>>]{<{}<>>({}<>)}])>}{({(([()[]]{[]()})({{}<>}<(){}>))[(<<><>>[()[]]){{()[]}<
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+({({([{{[[[{(<(){}><[]{}>)}]]][(<<([()[]](()[]))>[[[{}[]]{[]<>}](<()>[()<>]]]>(<(({}<>){<>[]}){<[]()>}>{[{(
+[([{(<[<<[({<[()<>][{}]>({{}{}})}({[<>{}][()()]}[([][]){()[]}]))]>>]>)<<[((([[{{()()}(<>{})}[(<>(
+{[[{<[[[[([[{[()[]]<[]()>}<({}())<[]<>>>]({<{}[]>}<<{}<>>>)](([(<>{}){[][]}]<[(){}]({}{})>)[((()){[]})<{{}
+{{<<((({(<[({<<>[]><{}{}>}((<>[])([]())))[((()[]){[]{}})]]{<([{}[]]<<>[]>)(({}[]}{[][]})><<([][])([][])>>}
+([[(<({[[{[{<[<><>]({}())>}](<[[{}[]](<><>)]{{()<>}[{}]}>{((<><>]<()()>)([(){}]<()>)})}{[<{({}())<<><>>}[(()
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2021/day10_syntax_scoring/tests/sample_input

@@ -0,0 +1,10 @@
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