32 lines
721 B
Rust
32 lines
721 B
Rust
use std::collections::HashSet;
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use aoc_libs::points::Point;
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use crate::{parse::Direction, rope::Rope};
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pub fn part2(input: &Vec<Direction>) -> usize {
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let mut visited: HashSet<Point> = HashSet::new();
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let mut rope: Rope<10> = Rope::new();
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visited.insert(*rope.get_tail_pos());
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for direction in input {
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rope.update_rope(direction);
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visited.insert(*rope.get_tail_pos());
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}
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visited.len()
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}
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#[cfg(test)]
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mod tests {
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use crate::parse::parse;
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use super::*;
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#[test]
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fn test_part2() {
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let input = parse(concat!(
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"R 5\n", "U 8\n", "L 8\n", "D 3\n", "R 17\n", "D 10\n", "L 25\n", "U 20\n",
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));
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assert_eq!(part2(&input), 36);
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}
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}
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