2021: day10: part 1

This commit is contained in:
Antoine Martin 2021-12-10 14:13:20 +01:00
parent 4cf5c2c6b0
commit 6c7b3d9cc6
5 changed files with 248 additions and 0 deletions

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aoc2021/input/day10.txt Normal file
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<{[[({([{<[[([()<>]<<><>>)<[[]()]{<>()}>][<(()[])<()<>>>]]<(<(<><>)(())>)[<([]()){<><>}>{{()<>}<{}>}]>>[({
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@ -0,0 +1,10 @@
[({(<(())[]>[[{[]{<()<>>
[(()[<>])]({[<{<<[]>>(
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(((({<>}<{<{<>}{[]{[]{}
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<{([{{}}[<[[[<>{}]]]>[]]

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aoc2021/src/day10.rs Normal file
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use std::fmt::Write;
use anyhow::{bail, Result};
const INPUT: &str = include_str!("../input/day10.txt");
pub fn run() -> Result<String> {
let mut res = String::with_capacity(128);
writeln!(res, "part 1: {}", part1(INPUT)?)?;
Ok(res)
}
fn part1(input: &str) -> Result<u64> {
let lines = input
.lines()
.map(str::parse::<Line>)
.collect::<Result<Vec<_>>>()?;
Ok(lines.iter().map(Line::corrupt_score).sum())
}
enum SymbolState {
Open(Symbol),
Close(Symbol),
}
impl TryFrom<char> for SymbolState {
type Error = anyhow::Error;
fn try_from(value: char) -> Result<Self> {
match value {
'(' | '[' | '{' | '<' => Ok(SymbolState::Open(value.try_into().unwrap())),
')' | ']' | '}' | '>' => Ok(SymbolState::Close(value.try_into().unwrap())),
_ => bail!("invalid char for symbol"),
}
}
}
#[derive(PartialEq, Eq)]
enum Symbol {
Parenthesis, // ()
Bracket, // []
Brace, // {}
AngleBracket, // <>
}
impl Symbol {
fn score(&self) -> u64 {
match self {
Symbol::Parenthesis => 3,
Symbol::Bracket => 57,
Symbol::Brace => 1197,
Symbol::AngleBracket => 25137,
}
}
}
impl TryFrom<char> for Symbol {
type Error = anyhow::Error;
fn try_from(value: char) -> Result<Self> {
match value {
'(' | ')' => Ok(Symbol::Parenthesis),
'[' | ']' => Ok(Symbol::Bracket),
'{' | '}' => Ok(Symbol::Brace),
'<' | '>' => Ok(Symbol::AngleBracket),
_ => bail!("invalid char for symbol"),
}
}
}
struct Line {
symbols: Vec<SymbolState>,
}
impl Line {
fn corrupt_score(&self) -> u64 {
let mut stack = Vec::new();
for state in &self.symbols {
match state {
SymbolState::Open(symbol) => stack.push(symbol),
SymbolState::Close(symbol) => match stack.pop() {
Some(other_symbol) if symbol == other_symbol => continue,
_ => return symbol.score(),
},
}
}
0
}
}
impl std::str::FromStr for Line {
type Err = anyhow::Error;
fn from_str(s: &str) -> Result<Self> {
Ok(Line {
symbols: s
.trim()
.chars()
.map(TryFrom::try_from)
.collect::<Result<Vec<_>>>()?,
})
}
}
#[cfg(test)]
mod tests {
use super::*;
const PROVIDED: &str = include_str!("../input/day10_provided.txt");
#[test]
fn part1_provided() {
assert_eq!(part1(PROVIDED).unwrap(), 26397);
}
#[test]
fn part1_real() {
assert_eq!(part1(INPUT).unwrap(), 394647);
}
}

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@ -9,3 +9,4 @@ pub mod day06;
pub mod day07;
pub mod day08;
pub mod day09;
pub mod day10;

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@ -11,6 +11,7 @@ use aoc2021::day06;
use aoc2021::day07;
use aoc2021::day08;
use aoc2021::day09;
use aoc2021::day10;
fn main() -> Result<()> {
let days: &[DayFunc] = &[
@ -23,6 +24,7 @@ fn main() -> Result<()> {
day07::run,
day08::run,
day09::run,
day10::run,
];
aoc::run(days)