Added Solution for 2023 day 23
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5 changed files with 548 additions and 0 deletions
15
2023/day23_a_long_walk/Cargo.toml
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15
2023/day23_a_long_walk/Cargo.toml
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[package]
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name = "day23_a_long_walk"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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[dev-dependencies]
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criterion = "0.5.1"
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[[bench]]
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name = "test_benchmark"
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harness = false
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119
2023/day23_a_long_walk/challenge.txt
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119
2023/day23_a_long_walk/challenge.txt
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The Elves resume water filtering operations! Clean water starts flowing over the edge of Island Island.
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They offer to help *you* go over the edge of Island Island, too! Just hold on tight to one end of this impossibly long rope and they'll lower you down a safe distance from the massive waterfall you just created.
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As you finally reach Snow Island, you see that the water isn't really reaching the ground: it's being *absorbed by the air* itself. It looks like you'll finally have a little downtime while the moisture builds up to snow-producing levels. Snow Island is pretty scenic, even without any snow; why not take a walk?
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There's a map of nearby hiking trails (your puzzle input) that indicates *paths* (`.`), *forest* (`#`), and steep *slopes* (`^`, `>`, `v`, and `<`).
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For example:
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```
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#.#####################
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#.......#########...###
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#######.#########.#.###
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###.....#.>.>.###.#.###
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###v#####.#v#.###.#.###
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###.>...#.#.#.....#...#
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###v###.#.#.#########.#
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###...#.#.#.......#...#
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#####.#.#.#######.#.###
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#.....#.#.#.......#...#
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#.#####.#.#.#########v#
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#.#...#...#...###...>.#
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#.#.#v#######v###.###v#
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#...#.>.#...>.>.#.###.#
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#####v#.#.###v#.#.###.#
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#.....#...#...#.#.#...#
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#.#########.###.#.#.###
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#...###...#...#...#.###
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###.###.#.###v#####v###
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#...#...#.#.>.>.#.>.###
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#.###.###.#.###.#.#v###
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#.....###...###...#...#
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#####################.#
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```
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You're currently on the single path tile in the top row; your goal is to reach the single path tile in the bottom row. Because of all the mist from the waterfall, the slopes are probably quite *icy*; if you step onto a slope tile, your next step must be *downhill* (in the direction the arrow is pointing). To make sure you have the most scenic hike possible, *never step onto the same tile twice*. What is the longest hike you can take?
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In the example above, the longest hike you can take is marked with `O`, and your starting position is marked `S`:
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```
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#S#####################
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#OOOOOOO#########...###
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#######O#########.#.###
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###OOOOO#OOO>.###.#.###
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###O#####O#O#.###.#.###
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###OOOOO#O#O#.....#...#
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###v###O#O#O#########.#
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###...#O#O#OOOOOOO#...#
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#####.#O#O#######O#.###
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#.....#O#O#OOOOOOO#...#
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#.#####O#O#O#########v#
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#.#...#OOO#OOO###OOOOO#
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#.#.#v#######O###O###O#
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#...#.>.#...>OOO#O###O#
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#####v#.#.###v#O#O###O#
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#.....#...#...#O#O#OOO#
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#.#########.###O#O#O###
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#...###...#...#OOO#O###
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###.###.#.###v#####O###
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#...#...#.#.>.>.#.>O###
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#.###.###.#.###.#.#O###
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#.....###...###...#OOO#
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#####################O#
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```
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This hike contains `*94*` steps. (The other possible hikes you could have taken were `90`, `86`, `82`, `82`, and `74` steps long.)
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Find the longest hike you can take through the hiking trails listed on your map. *How many steps long is the longest hike?*
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Your puzzle answer was `2222`.
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\--- Part Two ---
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----------
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As you reach the trailhead, you realize that the ground isn't as slippery as you expected; you'll have *no problem* climbing up the steep slopes.
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Now, treat all *slopes* as if they were normal *paths* (`.`). You still want to make sure you have the most scenic hike possible, so continue to ensure that you *never step onto the same tile twice*. What is the longest hike you can take?
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In the example above, this increases the longest hike to `*154*` steps:
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```
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#S#####################
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#OOOOOOO#########OOO###
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#######O#########O#O###
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###OOOOO#.>OOO###O#O###
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###O#####.#O#O###O#O###
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###O>...#.#O#OOOOO#OOO#
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###O###.#.#O#########O#
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###OOO#.#.#OOOOOOO#OOO#
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#####O#.#.#######O#O###
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#OOOOO#.#.#OOOOOOO#OOO#
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#O#####.#.#O#########O#
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#O#OOO#...#OOO###...>O#
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#O#O#O#######O###.###O#
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#OOO#O>.#...>O>.#.###O#
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#####O#.#.###O#.#.###O#
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#OOOOO#...#OOO#.#.#OOO#
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#O#########O###.#.#O###
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#OOO###OOO#OOO#...#O###
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###O###O#O###O#####O###
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#OOO#OOO#O#OOO>.#.>O###
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#O###O###O#O###.#.#O###
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#OOOOO###OOO###...#OOO#
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#####################O#
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```
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Find the longest hike you can take through the surprisingly dry hiking trails listed on your map. *How many steps long is the longest hike?*
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Your puzzle answer was `6590`.
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Both parts of this puzzle are complete! They provide two gold stars: \*\*
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At this point, you should [return to your Advent calendar](/2023) and try another puzzle.
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If you still want to see it, you can [get your puzzle input](23/input).
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250
2023/day23_a_long_walk/src/lib.rs
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2023/day23_a_long_walk/src/lib.rs
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use core::fmt::Display;
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use std::{num::ParseIntError, collections::{HashSet, BinaryHeap, HashMap}};
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#[derive(Debug, PartialEq, Eq)]
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pub enum ParseError<'a> {
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InvalidChar(char),
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LineMalformed(&'a str),
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NoDestError,
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NoStartError,
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NoUniqueDestError,
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NoUniqueStartError,
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ParseIntError(std::num::ParseIntError),
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}
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impl From<ParseIntError> for ParseError<'_> {
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fn from(value: ParseIntError) -> Self {
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Self::ParseIntError(value)
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}
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}
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impl Display for ParseError<'_> {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match self {
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Self::InvalidChar(c) => write!(f, "Invalid Character detected: \"{c}\" is not a valid map item."),
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Self::LineMalformed(v) => write!(f, "Line is malformed: {v}"),
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Self::NoDestError => write!(f, "Input does not contain a \".\" in its last line"),
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Self::NoStartError => write!(f, "Input does not contain a \".\" in its first line"),
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Self::NoUniqueDestError => write!(f, "Input contains more than one \".\" in its last line"),
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Self::NoUniqueStartError => write!(f, "Input contains more than one \".\" in its first line"),
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Self::ParseIntError(e) => write!(f, "Unable to parse into integer: {e}"),
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}
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}
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}
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#[derive(PartialEq, Eq, Hash, Clone, Copy)]
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struct Coordinate(usize, usize);
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#[derive(PartialEq, Eq, Hash)]
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enum Direction { North, West, East, South, }
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struct Map{
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path: HashSet<Coordinate>,
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slopes: HashSet<(Coordinate, Direction)>,
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start: Coordinate,
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dest: Coordinate,
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}
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impl<'a> TryFrom<&'a str> for Map {
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type Error = ParseError<'a>;
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fn try_from(value: &'a str) -> Result<Self, Self::Error> {
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let mut path = HashSet::new();
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let mut slopes = HashSet::new();
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for (y, line) in value.lines().enumerate() {
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for (x, c) in line.chars().enumerate() {
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match c {
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'#' => (),
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'.' => _ = path.insert(Coordinate(x, y)),
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'^' => _ = slopes.insert((Coordinate(x, y), Direction::North)),
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'<' => _ = slopes.insert((Coordinate(x, y), Direction::East)),
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'>' => _ = slopes.insert((Coordinate(x, y), Direction::West)),
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'v' => _ = slopes.insert((Coordinate(x, y), Direction::South)),
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e => return Err(Self::Error::InvalidChar(e)),
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}
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}
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}
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let first: Vec<_> = path.iter().filter(|c| c.1 == 0).collect();
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let start = match first.len() {
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0 => Err(Self::Error::NoStartError),
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1 => Ok(*first[0]),
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_ => Err(Self::Error::NoUniqueStartError),
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}?;
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let last: Vec<_> = path.iter().filter(|c| c.1 == value.lines().count()-1).collect();
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let dest = match last.len() {
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0 => Err(Self::Error::NoDestError),
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1 => Ok(*last[0]),
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_ => Err(Self::Error::NoUniqueDestError),
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}?;
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Ok(Self{ path, slopes, start, dest })
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}
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}
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impl Map {
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fn longest_route(&self, steep_slopes: bool) -> usize {
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let mut open_set = BinaryHeap::from([SearchState{ len: 0, pos: self.start, visited: HashSet::from([self.start]), }]);
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// let mut longest = HashMap::new();
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let mut longest_so_far = 0;
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// let mut coming_from = HashMap::new();
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while let Some(state) = open_set.pop() {
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let (len, pos, vis) = (state.len, state.pos, state.visited, );
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if pos == self.dest {
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longest_so_far = longest_so_far.max(len);
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}
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for neighbour in self.neighbours(pos, steep_slopes) {
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// if !path_contains(&coming_from, pos, neighbour.0) && !open_set.iter().any(|p| p.len >= len+neighbour.1 && p.pos == neighbour.0)
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if !vis.contains(&neighbour.0) { // && *longest.get(&(pos, neighbour.0)).unwrap_or(&0) <= len+neighbour.1
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let mut visited = vis.clone();
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visited.insert(neighbour.0);
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open_set.push(SearchState { len: len+neighbour.1, pos: neighbour.0, visited });
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// longest.insert((pos, neighbour.0), len+neighbour.1);
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// coming_from.insert(neighbour.0, pos);
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}
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}
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}
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longest_so_far
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}
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fn distances(&self) -> Vec<Vec<(usize, usize)>> {
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let mut res = Vec::new();
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let mut nodes = vec![self.start, self.dest];
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self.path.iter().filter(|n| self.neighbours(**n, false).len() > 2).for_each(|n| nodes.push(*n));
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self.slopes.iter().for_each(|s| nodes.push(s.0));
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nodes.iter().for_each(|from_node| {
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let mut this = Vec::new();
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self.neighbours(*from_node, false).iter().for_each(|n| {
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let mut prev = *from_node;
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let mut curr = n.0;
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let mut len = 1;
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loop {
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if let Some(to_idx) = nodes.iter().position(|n| n == &curr) {
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this.push((to_idx, len));
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break;
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}
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if let Some(&(next, _)) = self.neighbours(curr, false).iter().find(|&&(next, _)| next != prev) {
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len += 1;
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prev = curr;
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curr = next;
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} else {
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break;
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}
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}
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});
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res.push(this);
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});
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res
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}
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fn neighbours(&self, pos: Coordinate, steep_slopes: bool) -> Vec<(Coordinate, usize)> {
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let mut res = Vec::new();
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if pos.0 > 0 && self.path.contains(&Coordinate(pos.0-1, pos.1)) { res.push((Coordinate(pos.0-1, pos.1), 1)); }
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if pos.1 > 0 && self.path.contains(&Coordinate(pos.0, pos.1-1)) { res.push((Coordinate(pos.0, pos.1-1), 1)); }
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if self.path.contains(&Coordinate(pos.0+1, pos.1)) { res.push((Coordinate(pos.0+1, pos.1), 1)); }
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if self.path.contains(&Coordinate(pos.0, pos.1+1)) { res.push((Coordinate(pos.0, pos.1+1), 1)); }
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if steep_slopes {
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if pos.0 > 0 && self.slopes.contains(&(Coordinate(pos.0-1, pos.1), Direction::East)) { res.push((Coordinate(pos.0-2, pos.1), 2)); }
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if pos.1 > 0 && self.slopes.contains(&(Coordinate(pos.0, pos.1-1), Direction::North)) { res.push((Coordinate(pos.0, pos.1-2), 2)); }
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if self.slopes.contains(&(Coordinate(pos.0+1, pos.1), Direction::West)) { res.push((Coordinate(pos.0+2, pos.1), 2)); }
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if self.slopes.contains(&(Coordinate(pos.0, pos.1+1), Direction::South)) { res.push((Coordinate(pos.0, pos.1+2), 2)); }
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} else {
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if pos.0 > 0 && self.slopes.iter().any(|(p, _)| p == &Coordinate(pos.0-1, pos.1)) { res.push((Coordinate(pos.0-1, pos.1), 1)); }
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if pos.1 > 0 && self.slopes.iter().any(|(p, _)| p == &Coordinate(pos.0, pos.1-1)) { res.push((Coordinate(pos.0, pos.1-1), 1)); }
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if self.slopes.iter().any(|(p, _)| p == &Coordinate(pos.0+1, pos.1)) { res.push((Coordinate(pos.0+1, pos.1), 1)); }
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if self.slopes.iter().any(|(p, _)| p == &Coordinate(pos.0, pos.1+1)) { res.push((Coordinate(pos.0, pos.1+1), 1)); }
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}
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res
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}
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}
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#[derive(PartialEq, Eq)]
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struct SearchState {
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len: usize,
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pos: Coordinate,
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visited: HashSet<Coordinate>,
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}
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impl PartialOrd for SearchState {
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fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
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Some(self.cmp(other))
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}
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}
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impl Ord for SearchState {
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fn cmp(&self, other: &Self) -> std::cmp::Ordering {
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self.len.cmp(&other.len)
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}
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}
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pub fn run(input: &str) -> Result<(usize, usize), ParseError> {
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let map = Map::try_from(input)?;
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let first = map.longest_route(true);
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let distances = map.distances();
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let second = longest_route(&distances);
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Ok((first, second))
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}
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fn longest_route(distances: &[Vec<(usize, usize)>]) -> usize {
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||||||
|
let mut longest_so_far = 0;
|
||||||
|
let mut open_set = vec![vec![0]];
|
||||||
|
while let Some(path) = open_set.pop() {
|
||||||
|
let curr = *path.last().unwrap();
|
||||||
|
if curr == 1 {
|
||||||
|
let len = path.windows(2).map(|w| distances[w[0]].iter().find(|&&(to, _len)| to == w[1]).unwrap().1).sum();
|
||||||
|
if len > longest_so_far {
|
||||||
|
longest_so_far = len;
|
||||||
|
}
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
distances[curr].iter().filter(|(n, _)| !path.contains(n)).for_each(|(next, _len)| {
|
||||||
|
let mut new = path.to_vec();
|
||||||
|
new.push(*next);
|
||||||
|
open_set.push(new);
|
||||||
|
});
|
||||||
|
}
|
||||||
|
longest_so_far
|
||||||
|
}
|
||||||
|
|
||||||
|
fn path_contains(path: &HashMap<Coordinate, Coordinate>, dest: Coordinate, query: Coordinate) -> bool {
|
||||||
|
if let Some(&prev) = path.get(&dest) {
|
||||||
|
if prev == query {
|
||||||
|
false
|
||||||
|
} else {
|
||||||
|
path_contains(path, prev, query)
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
true
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[cfg(test)]
|
||||||
|
mod tests {
|
||||||
|
use super::*;
|
||||||
|
use std::fs::read_to_string;
|
||||||
|
|
||||||
|
fn read_file(name: &str) -> String {
|
||||||
|
read_to_string(name).expect(&format!("Unable to read file: {name}")[..]).trim().to_string()
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn test_sample() {
|
||||||
|
let sample_input = read_file("tests/sample_input");
|
||||||
|
assert_eq!(run(&sample_input), Ok((94, 154)));
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn test_challenge() {
|
||||||
|
let challenge_input = read_file("tests/challenge_input");
|
||||||
|
assert_eq!(run(&challenge_input), Ok((2222, 6590))); // >6066
|
||||||
|
}
|
||||||
|
}
|
141
2023/day23_a_long_walk/tests/challenge_input
Normal file
141
2023/day23_a_long_walk/tests/challenge_input
Normal file
|
@ -0,0 +1,141 @@
|
||||||
|
#.###########################################################################################################################################
|
||||||
|
#...###...#...#...#...###.....#...#...#.................#...#.......#.......###.....#.......#...#.....#####...#...#.....#.....###.....#.....#
|
||||||
|
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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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|
||||||
|
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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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|
||||||
|
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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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|
||||||
|
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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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|
||||||
|
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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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|
||||||
|
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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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|
||||||
|
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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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||||||
|
#...#...#...###...#...#.........#.......#...#...#.....###...#...#...#.....###.....#...#...###...###...###.....###...#####...................#
|
||||||
|
###########################################################################################################################################.#
|
23
2023/day23_a_long_walk/tests/sample_input
Normal file
23
2023/day23_a_long_walk/tests/sample_input
Normal file
|
@ -0,0 +1,23 @@
|
||||||
|
#.#####################
|
||||||
|
#.......#########...###
|
||||||
|
#######.#########.#.###
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|
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|
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||||||
|
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|
||||||
|
#.....###...###...#...#
|
||||||
|
#####################.#
|
Loading…
Add table
Add a link
Reference in a new issue