Refactor day 10
This commit is contained in:
parent
2103005872
commit
6d9fbe0edf
|
@ -1,71 +1,46 @@
|
||||||
#![feature(test)]
|
#![feature(test)]
|
||||||
extern crate test;
|
extern crate test;
|
||||||
|
|
||||||
use aoc2021::common::*;
|
use aoc2021::common::*;
|
||||||
|
|
||||||
const DAY: usize = 10;
|
const DAY: usize = 10;
|
||||||
type Parsed<'a> = Vec<&'a str>;
|
|
||||||
|
|
||||||
fn parse_input(raw: &str) -> Parsed {
|
fn solve(input: &str) -> (usize, usize) {
|
||||||
raw.lines().collect()
|
let mut p1_score = 0;
|
||||||
}
|
let mut p2_scores = Vec::new();
|
||||||
|
let mut stack = Vec::new();
|
||||||
fn solve(parsed: &Parsed) -> (usize, usize) {
|
for line in input.lines() {
|
||||||
let mut points = 0;
|
match is_well_formed(line, &mut stack) {
|
||||||
let mut p2_points = Vec::new();
|
Ok(s) => p2_scores.push(autocomplete_points(s)), // <- clears the stack internally
|
||||||
for &line in parsed {
|
Err(p) => {
|
||||||
let mut stack = Vec::new();
|
p1_score += p;
|
||||||
let mut invalid = false;
|
stack.clear();
|
||||||
for c in line.bytes() {
|
|
||||||
match c {
|
|
||||||
b'(' | b'[' | b'<' | b'{' => stack.push(c),
|
|
||||||
b')' if stack.last() == Some(&b'(') => {
|
|
||||||
stack.pop();
|
|
||||||
}
|
|
||||||
b']' if stack.last() == Some(&b'[') => {
|
|
||||||
stack.pop();
|
|
||||||
}
|
|
||||||
b'>' if stack.last() == Some(&b'<') => {
|
|
||||||
stack.pop();
|
|
||||||
}
|
|
||||||
b'}' if stack.last() == Some(&b'{') => {
|
|
||||||
stack.pop();
|
|
||||||
}
|
|
||||||
b')' => {
|
|
||||||
points += 3;
|
|
||||||
invalid = true;
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
b']' => {
|
|
||||||
points += 57;
|
|
||||||
invalid = true;
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
b'}' => {
|
|
||||||
points += 1197;
|
|
||||||
invalid = true;
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
b'>' => {
|
|
||||||
points += 25137;
|
|
||||||
invalid = true;
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
_ => unreachable!(),
|
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
if invalid {
|
|
||||||
continue;
|
|
||||||
}
|
|
||||||
p2_points.push(autocomplete_points(stack));
|
|
||||||
}
|
}
|
||||||
let p2_len = p2_points.len();
|
let p2_len = p2_scores.len();
|
||||||
(points, *p2_points.select_nth_unstable(p2_len / 2).1)
|
(p1_score, *p2_scores.select_nth_unstable(p2_len / 2).1)
|
||||||
}
|
}
|
||||||
|
|
||||||
fn autocomplete_points(stack: Vec<u8>) -> usize {
|
fn is_well_formed<'a>(line: &str, stack: &'a mut Vec<u8>) -> Result<&'a mut Vec<u8>, usize> {
|
||||||
|
for c in line.bytes() {
|
||||||
|
match (stack.last(), c) {
|
||||||
|
(_, b'(' | b'[' | b'<' | b'{') => stack.push(c),
|
||||||
|
(Some(b'('), b')') | (Some(b'['), b']') | (Some(b'{'), b'}') | (Some(b'<'), b'>') => {
|
||||||
|
stack.pop();
|
||||||
|
}
|
||||||
|
(_, b')') => return Err(3),
|
||||||
|
(_, b']') => return Err(57),
|
||||||
|
(_, b'}') => return Err(1197),
|
||||||
|
(_, b'>') => return Err(25137),
|
||||||
|
_ => unreachable!(),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
Ok(stack)
|
||||||
|
}
|
||||||
|
|
||||||
|
fn autocomplete_points(stack: &mut Vec<u8>) -> usize {
|
||||||
let mut points = 0;
|
let mut points = 0;
|
||||||
for p in stack.into_iter().rev() {
|
for p in stack.drain(..).rev() {
|
||||||
points *= 5;
|
points *= 5;
|
||||||
match p {
|
match p {
|
||||||
b'(' => points += 1,
|
b'(' => points += 1,
|
||||||
|
@ -80,8 +55,7 @@ fn autocomplete_points(stack: Vec<u8>) -> usize {
|
||||||
|
|
||||||
fn main() {
|
fn main() {
|
||||||
let raw = read_file(DAY);
|
let raw = read_file(DAY);
|
||||||
let input = parse_input(&raw);
|
let (p1, p2) = solve(&raw);
|
||||||
let (p1, p2) = solve(&input);
|
|
||||||
println!("Part 1: {p1}");
|
println!("Part 1: {p1}");
|
||||||
println!("Part 2: {p2}");
|
println!("Part 2: {p2}");
|
||||||
}
|
}
|
||||||
|
@ -102,29 +76,25 @@ mod tests {
|
||||||
<{([([[(<>()){}]>(<<{{
|
<{([([[(<>()){}]>(<<{{
|
||||||
<{([{{}}[<[[[<>{}]]]>[]]";
|
<{([{{}}[<[[[<>{}]]]>[]]";
|
||||||
|
|
||||||
#[test]
|
#[bench]
|
||||||
fn test_autocomplete_points() {
|
fn bench_autocomplete_points(b: &mut test::Bencher) {
|
||||||
assert_eq!(autocomplete_points(vec![b'<', b'{', b'(', b'[']), 294);
|
let sample_stack = vec![b'<', b'{', b'(', b'['];
|
||||||
|
b.iter(|| assert_eq!(autocomplete_points(test::black_box(&mut sample_stack.clone())), 294));
|
||||||
}
|
}
|
||||||
|
|
||||||
#[test]
|
#[test]
|
||||||
fn part1_test() {
|
fn part1_test() {
|
||||||
let input = parse_input(TEST_INPUT);
|
assert_eq!(solve(TEST_INPUT).0, 26397);
|
||||||
assert_eq!(solve(&input).0, 26397);
|
|
||||||
}
|
}
|
||||||
|
|
||||||
#[test]
|
#[test]
|
||||||
fn part2_test() {
|
fn part2_test() {
|
||||||
let input = parse_input(TEST_INPUT);
|
assert_eq!(solve(TEST_INPUT).1, 288957);
|
||||||
assert_eq!(solve(&input).1, 288957);
|
|
||||||
}
|
}
|
||||||
|
|
||||||
#[bench]
|
#[bench]
|
||||||
fn bench_solution(b: &mut test::Bencher) {
|
fn bench_solution(b: &mut test::Bencher) {
|
||||||
let raw = read_file(DAY);
|
let raw = read_file(DAY);
|
||||||
let input = parse_input(&raw);
|
b.iter(|| assert_eq!(solve(test::black_box(&raw)), (358737, 4329504793)))
|
||||||
b.iter(|| assert_eq!(solve(test::black_box(&input)), (358737, 4329504793)))
|
|
||||||
}
|
}
|
||||||
|
|
||||||
bench_input!(Vec::len => 90);
|
|
||||||
}
|
}
|
||||||
|
|
Loading…
Reference in New Issue
Block a user