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aoc2021
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Added Day 10 Part 2

This commit is contained in:
Ishan Jain 2021-12-10 11:58:11 +05:30
parent a1d1ff08c1
commit 67f7049ced
1 changed files with 27 additions and 19 deletions
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46
src/main.rs
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@ -11,43 +11,51 @@ fn parse_input(input: &'static str) -> impl Iterator<Item = &'static str> {
}
fn solution(input: impl Iterator<Item = &'static str>) -> u64 {
let mut score = 0;
for line in input {
let mut candidates = vec![];
'outer: for line in input {
let mut stack = Vec::with_capacity(line.len());
for c in line.chars() {
match c {
'{' | '(' | '<' | '[' => stack.push(c),
'}' => {
if stack.pop() != Some('{') {
score += 1197
'}' | ']' | '>' => {
if stack.pop() != Some((c as u8 - 2) as char) {
continue 'outer;
}
}
')' => {
if stack.pop() != Some('(') {
score += 3
}
}
'>' => {
if stack.pop() != Some('<') {
score += 25137
}
}
']' => {
if stack.pop() != Some('[') {
score += 57
continue 'outer;
}
}
_ => unreachable!(),
}
}
let mut score = 0;
while let Some(v) = stack.pop() {
score *= 5;
match v {
'(' => score += 1,
'[' => score += 2,
'{' => score += 3,
'<' => score += 4,
_ => unreachable!(),
}
}
candidates.push(score);
}
score
let l = candidates.len();
candidates.select_nth_unstable(l / 2);
candidates[candidates.len() / 2]
}
fn main() {