/
day07.rs
57 lines (49 loc) · 1.54 KB
/
day07.rs
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use std::str::FromStr;
fn parse_listing(input: &str) -> Vec<i32> {
let lines: Vec<&str> = input.lines().collect();
let mut current: Vec<i32> = vec![];
let mut done: Vec<i32> = vec![];
for line in lines {
if line.starts_with("$ cd") {
if line.contains("..") {
done.push(current.pop().unwrap());
}
else {
current.push(0);
}
}
else if !line.starts_with("$ ls") && !line.starts_with("dir") {
let num = i32::from_str(line.split_once(' ').expect("Line should have a space").0).unwrap();
for i in &mut current {
*i += num;
}
}
}
done.extend(¤t);
done
}
pub fn solve_part1(input: &str) -> usize {
let listing: Vec<i32> = parse_listing(input);
listing.iter().filter(|n| **n <= 100000).sum::<i32>() as usize
}
pub fn solve_part2(input: &str) -> i32 {
let listing: Vec<i32> = parse_listing(input);
let max = listing.iter().max().unwrap();
let unused = 70000000 - max;
let required = 30000000 - unused;
listing.iter().filter(|n| **n >= required).min().copied().unwrap()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_part_one() {
let input = crate::common::input::read_file(2022, 7, "testinput");
assert_eq!(solve_part1(&input), 95437);
}
#[test]
fn test_part_two() {
let input = crate::common::input::read_file(2022, 7, "testinput");
assert_eq!(solve_part2(&input), 24933642);
}
}