219 lines
6.6 KiB
Rust
219 lines
6.6 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, HashSet};
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use std::fmt;
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use itertools::Itertools;
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#[derive(Debug, PartialEq, Eq, Hash, Clone)]
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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 = ((field.get(&(robot_position + (robot_direction + 1))) == Some(&'#')) as i8) * 2 - 1;
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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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.rev()
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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 mut input = read_input();
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let field: HashMap<Position2D, char> = IntComputer::without_params(input.clone())
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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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// this rev breaks part 1 but is necessary for part 2
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.rev()
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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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println!("Commands: {}", commands.len());
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for c in commands.iter() {
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println!("{}", c);
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}
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let mut pos = 0;
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let mut segments = Vec::new();
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/*let segments = vec![
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vec![
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Movement{ rotation: -1, distance: 8 },
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Movement{ rotation: 1, distance: 12 },
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Movement{ rotation: 1, distance: 12 },
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Movement{ rotation: 1, distance: 10 },
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],
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vec![
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Movement{ rotation: 1, distance: 10 },
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Movement{ rotation: 1, distance: 12 },
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Movement{ rotation: 1, distance: 10 },
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],
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vec![
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Movement{ rotation: -1, distance: 10 },
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Movement{ rotation: 1, distance: 10 },
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Movement{ rotation: -1, distance: 6 },
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]
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];*/
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while pos < commands.len() - 4 {
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if let Some((n, mov)) = (2..=4)
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.filter_map(|i| {
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let reference = commands[pos..].windows(i).next();
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if segments.contains(&reference.unwrap()) {
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Some(((i, 99), reference))
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} else {
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let dupes = commands[pos..]
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.windows(i)
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.filter(|&w| Some(w) == reference)
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.count();
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if dupes > 0 {
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Some(((i, dupes), reference))
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} else {
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None
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}
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}
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})
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.inspect(|_| println!("hit for {}", pos))
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.max_by_key(|((x, y), _)| x * y)
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{
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pos += n.0;
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segments.push(mov.unwrap());
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} else {
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//panic!("nothing found at position {}", pos);
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}
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}
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let filtered: HashSet<_> = segments
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.clone()
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.into_iter()
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/*
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.map(|mut curr| {
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for s in &segments {
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if curr.len() <= s.len() {
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continue;
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}
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let index_after = curr.len() - s.len();
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if s == &&curr[index_after..] {
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curr = &curr[..index_after];
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}
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if s == &&curr[..index_after] {
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curr = &curr[index_after..];
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}
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}
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curr
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})
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.filter(|s| !s.is_empty())
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*/
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.collect();
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let mut filtered: Vec<_> = filtered
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.into_iter()
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.zip(['A', 'B', 'C'].iter())
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.collect();
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filtered.sort_by_key(|(_, c)| c.to_owned());
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dbg!(&segments, segments.len());
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dbg!(filtered.len());
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println!(
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"{}",
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filtered
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.iter()
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.map(|s| s.0.iter().map(|m| m.to_string()).collect::<String>() + "\n")
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.collect::<String>()
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);
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//let filtered = segments;
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let mut instructions = Vec::new();
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let mut pos = 0;
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while pos < commands.len() {
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println!("searching");
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for i in 1.. {
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if filtered.iter().any(|(c, _)| c == &&commands[pos..pos + i]) {
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instructions.push(&commands[pos..pos + i]);
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pos += i;
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println!("match for {}..{}", pos, i);
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break;
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} else {
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println!("no match for {}..{}", pos, i);
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}
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}
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}
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fn dir(rotation: i8) -> char {
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if rotation == 1 { 'R' } else { 'L' }
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}
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input[0] = 2;
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let raw_path = (instructions.iter().map(|i| filtered.iter().find(|(f, c)| i == f).unwrap().1).join(",")
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+ "\n"
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+ &filtered.into_iter().map(|(f, _)| f.iter().map(|m| format!("{},{}", dir(m.rotation), m.distance)).join(",")).join("\n")
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+ "\nn\n");
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let path: Vec<i64> = raw_path
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.chars()
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.map(|c| c as i64)
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.rev()
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.collect();
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println!(
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"Part 2: {:?}",
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IntComputer::new(input, 0, path).get_all_outputs().pop()
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);
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}
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