47 lines
877 B
Rust
47 lines
877 B
Rust
use itertools::Itertools;
|
|
use std::fs::read_to_string;
|
|
|
|
fn main() {
|
|
let input = read_to_string("input/day01.txt").unwrap();
|
|
let part1 = part1(&input);
|
|
println!("part1: {}", part1);
|
|
}
|
|
|
|
type Int = i32;
|
|
|
|
fn part1(input: &str) -> Int {
|
|
let (mut l, mut r) = input
|
|
.trim()
|
|
.lines()
|
|
.map(|line| line.split_ascii_whitespace().collect_tuple().unwrap())
|
|
.map(|(x, y)| (x.parse::<Int>().unwrap(), y.parse::<Int>().unwrap()))
|
|
.fold((vec![], vec![]), |(mut v1, mut v2), (a, b)| {
|
|
v1.push(a);
|
|
v2.push(b);
|
|
(v1, v2)
|
|
});
|
|
|
|
l.sort();
|
|
r.sort();
|
|
|
|
l.into_iter()
|
|
.zip(r.into_iter())
|
|
.map(|(l, r)| (l - r).abs())
|
|
.sum()
|
|
}
|
|
|
|
#[cfg(test)]
|
|
const TEST_INPUT: &str = r"
|
|
3 4
|
|
4 3
|
|
2 5
|
|
1 3
|
|
3 9
|
|
3 3
|
|
";
|
|
|
|
#[test]
|
|
fn test() {
|
|
assert_eq!(part1(TEST_INPUT), 11);
|
|
}
|