101 lines
2.7 KiB
Rust
101 lines
2.7 KiB
Rust
use grid::*;
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use intcode::*;
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use std::char;
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use std::collections::HashMap;
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use std::fmt;
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#[derive(Debug, PartialEq)]
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struct Movement {
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rotation: i8,
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distance: u8,
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}
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impl fmt::Display for Movement {
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fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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let dir_char = if self.rotation == 1 { 'R' } else { 'L' };
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write!(f, "{}{}", dir_char, self.distance)
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}
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}
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#[rustfmt::skip]
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fn find_commands(field: &HashMap<Position2D, char>) -> Vec<Movement> {
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let mut robot_position = field.iter().find(|(_, c)| *c == &'^').unwrap().0.to_owned();
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let mut robot_direction = Direction::Up;
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let mut commands = Vec::new();
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loop {
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let mut steps = 0;
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let turn = if field.get(&(robot_position + (robot_direction + 1))) == Some(&'#') {
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1
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} else {
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-1
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};
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robot_direction += turn;
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while field.get(&(robot_position + robot_direction)) == Some(&'#') {
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robot_position += robot_direction;
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steps += 1;
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}
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commands.push(Movement {
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distance: steps,
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rotation: turn,
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});
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if robot_position.neighbors().iter().filter(|(_, p)| field.get(p) == Some(&'#')).count() == 1 {
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break;
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}
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}
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commands
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}
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fn test_input() -> HashMap<Position2D, char> {
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"#######...#####
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#.....#...#...#
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#.....#...#...#
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......#...#...#
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......#...###.#
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......#.....#.#
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^########...#.#
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......#.#...#.#
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......#########
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........#...#..
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....#########..
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....#...#......
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....#...#......
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....#...#......
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....#####......"
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.lines()
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.enumerate()
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.flat_map(move |(y, s)| s.chars().enumerate().map(move |(x, c)| ((x, y).into(), c)))
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.collect()
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}
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fn main() {
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// The main reason I use a hashmap here (instead of a 2D vector) is that my abstractions for
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// ascii stuff all use maps ヽ( ﾟヮ・)ノ
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let field: HashMap<Position2D, char> = IntComputer::without_params(read_input())
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.get_all_outputs()
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.iter()
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.map(|n| char::from_u32(*n as u32).unwrap())
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.collect::<String>()
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.lines()
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.enumerate()
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.flat_map(move |(y, s)| s.chars().enumerate().map(move |(x, c)| ((x, y).into(), c)))
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.collect();
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// let field = test_input();
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let p1 = field
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.iter()
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.filter(|(pos, obj)| {
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*obj == &'#'
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&& pos
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.neighbors()
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.iter()
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.all(|(_, p)| field.get(&p) == Some(&'#'))
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})
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.fold(0, |acc, (pos, _)| acc + pos.x * pos.y);
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println!("Part 1: {}", p1);
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println!("{}", draw_ascii(&field, '.'));
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let commands = find_commands(&field);
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for c in &commands {
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print!("{}", c);
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}
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}
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