48 lines
984 B
Rust
48 lines
984 B
Rust
use std::{env, io};
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use aoc_2022_09::{parse_input, Rope, Visited};
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fn main() -> io::Result<()> {
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let infile_path = env::args().nth(1).expect("input file");
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let result = solve(&infile_path)?;
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println!("{result}");
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Ok(())
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}
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fn solve(path: &str) -> io::Result<usize> {
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let directions = parse_input(path)?;
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let mut rope = Rope::new(10);
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let mut tail_visited = Visited::new();
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tail_visited.insert(rope.tail().unwrap().clone());
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for direction in directions {
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direction.apply_to_rope(&mut rope, &mut tail_visited);
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}
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Ok(tail_visited.len())
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn sample() {
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let result = solve("inputs/test.txt").unwrap();
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assert_eq!(1, result);
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let result = solve("inputs/test2.txt").unwrap();
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assert_eq!(36, result);
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}
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#[test]
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fn puzzle() {
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let result = solve("inputs/puzzle.txt").unwrap();
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assert_eq!(2273, result);
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}
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}
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