day 09.
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parent
dfc41a1167
commit
3b18b90bda
2
Cargo.lock
generated
2
Cargo.lock
generated
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@ -65,6 +65,8 @@ name = "day09"
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version = "0.1.0"
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version = "0.1.0"
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dependencies = [
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dependencies = [
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"aoc_libs",
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"aoc_libs",
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"once_cell",
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"regex",
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]
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]
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[[package]]
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[[package]]
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@ -7,3 +7,5 @@ edition.workspace = true
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[dependencies]
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[dependencies]
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aoc_libs.workspace = true
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aoc_libs.workspace = true
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regex.workspace = true
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once_cell.workspace = true
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@ -12,6 +12,6 @@ fn main() {
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println!("Part One");
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println!("Part One");
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println!("Result: {}", part1::part1(&structured_input));
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println!("Result: {}", part1::part1(&structured_input));
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// println!("Part Two");
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println!("Part Two");
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// println!("Result: {}", part2::part2(&structured_input));
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println!("Result: {}", part2::part2(&structured_input));
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}
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}
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@ -1,3 +1,6 @@
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use once_cell::sync::Lazy;
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use regex::Regex;
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum Direction {
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pub enum Direction {
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Up,
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Up,
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@ -6,18 +9,25 @@ pub enum Direction {
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Left,
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Left,
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}
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}
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static PARSE_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"^([URDL]) (\d+)$").unwrap());
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pub fn parse(input: &str) -> Vec<Direction> {
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pub fn parse(input: &str) -> Vec<Direction> {
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let mut ret = Vec::new();
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let mut ret = Vec::new();
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for line in input.lines() {
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for line in input.lines() {
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let mut chars = line.chars();
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let captures = PARSE_REGEX
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let dir = match chars.next().unwrap() {
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.captures(line)
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'U' => Direction::Up,
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.unwrap_or_else(|| panic!("invalid line {}", line));
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'R' => Direction::Right,
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let dir = match &captures[1] {
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'D' => Direction::Down,
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"U" => Direction::Up,
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'L' => Direction::Left,
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"R" => Direction::Right,
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"D" => Direction::Down,
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"L" => Direction::Left,
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_ => panic!("invalid direction char"),
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_ => panic!("invalid direction char"),
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};
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};
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for _ in 0..chars.nth(1).unwrap().to_digit(10).unwrap() {
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for _ in 0..captures[2]
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.parse()
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.unwrap_or_else(|_| panic!("invalid line {}", line))
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{
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ret.push(dir)
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ret.push(dir)
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}
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}
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}
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}
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@ -2,25 +2,30 @@ use std::collections::HashSet;
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use aoc_libs::points::Point;
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use aoc_libs::points::Point;
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use crate::{rope::Rope, parse::Direction};
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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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pub fn part2(input: &Vec<Direction>) -> usize {
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let mut visited: HashSet<Point> = HashSet::new();
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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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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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for direction in input {
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visited.insert(*rope.get_tail_pos());
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rope.update_rope(direction);
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rope.update_rope(direction);
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println!("{}", rope)
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visited.insert(*rope.get_tail_pos());
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}
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}
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visited.len()
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visited.len()
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}
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}
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#[cfg(test)]
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#[cfg(test)]
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mod tests {
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mod tests {
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use crate::parse::parse;
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use super::*;
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use super::*;
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#[test]
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#[test]
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fn test_part2() {
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fn test_part2() {
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assert_eq!(0, 0);
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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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}
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}
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@ -23,14 +23,12 @@ impl<const L: usize> Rope<L> {
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Direction::Down => Point { x: 0, y: -1 },
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Direction::Down => Point { x: 0, y: -1 },
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Direction::Left => Point { x: -1, y: 0 },
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Direction::Left => Point { x: -1, y: 0 },
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};
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};
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println!("direction is {:?}", direction);
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for segment in 1..self.segments.len() {
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for segment in 1..self.segments.len() {
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self.segments[segment] += Rope::<L>::update_single_segment_pair(
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self.segments[segment] += Rope::<L>::update_single_segment_pair(
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&self.segments[segment - 1],
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&self.segments[segment - 1],
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&self.segments[segment],
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&self.segments[segment],
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)
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)
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}
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}
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println!("{}", self);
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}
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}
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pub fn get_tail_pos(&self) -> &Point {
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pub fn get_tail_pos(&self) -> &Point {
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@ -77,7 +75,7 @@ impl<const L: usize> Display for Rope<{ L }> {
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}
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}
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for segment in self.segments.iter().skip(1) {
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for segment in self.segments.iter().skip(1) {
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let delta = *segment-self.segments[0];
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let delta = *segment - self.segments[0];
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let upoint = delta.to_upoint(&zero_point).unwrap();
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let upoint = delta.to_upoint(&zero_point).unwrap();
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grid[upoint.y][upoint.x] = 'T'
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grid[upoint.y][upoint.x] = 'T'
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}
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}
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@ -138,9 +136,11 @@ mod tests {
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let mut visited: HashSet<Point> = HashSet::new();
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let mut visited: HashSet<Point> = HashSet::new();
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let mut rope: Rope<2> = Rope::new();
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let mut rope: Rope<2> = Rope::new();
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visited.insert(*rope.get_tail_pos());
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visited.insert(*rope.get_tail_pos());
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println!("{}", rope);
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for direction in input {
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for direction in input {
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rope.update_rope(&direction);
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rope.update_rope(&direction);
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visited.insert(*rope.get_tail_pos());
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visited.insert(*rope.get_tail_pos());
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println!("{}", rope);
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}
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}
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// let mut graph = [
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// let mut graph = [
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// ['.', '.', '.', '.', '.', '.'],
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// ['.', '.', '.', '.', '.', '.'],
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