This commit is contained in:
Max Nuding 2022-12-12 06:21:55 +00:00
parent 8a2aa96881
commit e40e06510b
3 changed files with 162 additions and 4 deletions

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use crate::read; use crate::read;
use itertools::Itertools; use itertools::Itertools;
//#[derive(Debug, PartialEq, Eq, Clone, Hash)] #[derive(Debug, PartialEq, Eq, Clone, Hash, Default)]
struct Coord {
pub row: i32,
pub col: i32,
}
pub fn run() { pub fn run() {
let input = read("12"); let input = read("12");
let lines = input.lines(); let lines = input.lines();
let lines = input.split("\n\n"); let mut start: Coord = Default::default();
let mut target: Coord = Default::default();
let map = lines
.enumerate()
.map(|(r, l)| {
l.chars()
.enumerate()
.map(|(col, c)| match c {
'S' => {
start = Coord {
row: r as i32,
col: col as i32,
};
0
}
'E' => {
target = Coord {
row: r as i32,
col: col as i32,
};
25
}
c => (c as u32) - ('a' as u32),
})
.collect_vec()
})
.collect_vec();
#[cfg(feature = "part1")] #[cfg(feature = "part1")]
{ {
println!("Day 12, Part 01: {}", "TODO"); println!("Day 12, Part 01: {:?}", bfs(&map, start, target.clone()));
} }
#[cfg(feature = "part2")] #[cfg(feature = "part2")]
{ {
println!("Day 12, Part 02: {}", "TODO"); let starting_points = map
.iter()
.enumerate()
.flat_map(|(row, v)| {
v.iter()
.enumerate()
.filter(|(_, vv)| **vv == 0)
.map(|(col, _)| Coord {
row: row as i32,
col: col as i32,
})
.collect_vec()
})
.collect_vec();
let min = starting_points
.iter()
.filter_map(|start| bfs(&map, start.clone(), target.clone()))
.min();
println!("Day 12, Part 02: {:?}", min);
} }
} }
fn bfs(map: &Vec<Vec<u32>>, start: Coord, target: Coord) -> Option<usize> {
let mut visited = vec![vec![false; map[0].len()]; map.len()];
let mut queue = std::collections::VecDeque::new();
queue.push_back((start, 0));
while let Some((next, path_length)) = queue.pop_front() {
if next == target {
return Some(path_length);
}
let up = Coord {
row: next.row - 1,
col: next.col,
};
let down = Coord {
row: next.row + 1,
col: next.col,
};
let left = Coord {
row: next.row,
col: next.col - 1,
};
let right = Coord {
row: next.row,
col: next.col + 1,
};
let can_down = check_bounds(&down, map)
&& !visited[down.row as usize][down.col as usize]
&& map[next.row as usize][next.col as usize] + 1
>= map[down.row as usize][down.col as usize];
if can_down {
visited[down.row as usize][down.col as usize] = true;
queue.push_back((down, path_length + 1));
}
let can_up = check_bounds(&up, map)
&& !visited[up.row as usize][up.col as usize]
&& map[next.row as usize][next.col as usize] + 1
>= map[up.row as usize][up.col as usize];
if can_up {
visited[up.row as usize][up.col as usize] = true;
queue.push_back((up, path_length + 1));
}
let can_left = check_bounds(&left, map)
&& !visited[left.row as usize][left.col as usize]
&& map[next.row as usize][next.col as usize] + 1
>= map[left.row as usize][left.col as usize];
if can_left {
visited[left.row as usize][left.col as usize] = true;
queue.push_back((left, path_length + 1));
}
let can_right = check_bounds(&right, map)
&& !visited[right.row as usize][right.col as usize]
&& map[next.row as usize][next.col as usize] + 1
>= map[right.row as usize][right.col as usize];
if can_right {
visited[right.row as usize][right.col as usize] = true;
queue.push_back((right, path_length + 1));
}
}
None
}
fn check_bounds(coord: &Coord, map: &Vec<Vec<u32>>) -> bool {
coord.row >= 0
&& coord.col >= 0
&& coord.row < map.len() as i32
&& coord.row < map.len() as i32
&& coord.col < map[coord.row as usize].len() as i32
}