79 lines
1.9 KiB
Rust
79 lines
1.9 KiB
Rust
use aoc_shared::enums::Direction;
|
|
use aoc_shared::grid::Grid as BaseGrid;
|
|
use aoc_shared::impl_grid_newtype;
|
|
|
|
#[derive(Debug)]
|
|
struct Grid<T>(BaseGrid<T>);
|
|
impl_grid_newtype!(Grid, BaseGrid<char>, char);
|
|
|
|
impl Grid<char> {
|
|
pub fn from_file_str(file_str: &str) -> Self {
|
|
let lines: Vec<&str> = file_str.lines().collect();
|
|
let width = lines[0].len();
|
|
|
|
let mut grid = Grid::new(width);
|
|
lines
|
|
.into_iter()
|
|
.map(|line| line.chars())
|
|
.for_each(|line_chars| grid.vec.append(&mut line_chars.collect::<Vec<char>>()));
|
|
|
|
grid
|
|
}
|
|
|
|
fn find_pos(&self, value: char) -> Option<usize> {
|
|
self.vec.iter().position(|item| *item == value)
|
|
}
|
|
|
|
fn find_start_and_end(&self) -> (usize, usize) {
|
|
let start = self.vec.iter().position(|item| *item == 'S').unwrap();
|
|
let end = self.vec.iter().position(|item| *item == 'E').unwrap();
|
|
|
|
(start, end)
|
|
}
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
#[derive(Debug)]
|
|
struct Pathfinder {
|
|
grid: Grid<char>,
|
|
steps: Vec<Direction>,
|
|
}
|
|
|
|
impl Pathfinder {
|
|
pub fn from_file_str(file_str: &str) -> Self {
|
|
Pathfinder {
|
|
grid: Grid::from_file_str(file_str),
|
|
steps: Vec::new(),
|
|
}
|
|
}
|
|
|
|
fn find_start_and_end(&self) -> (usize, usize) {
|
|
(self.grid.find_pos('S').unwrap(), self.grid.find_pos('E').unwrap())
|
|
}
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
fn main() {
|
|
let file_str = include_str!("input.txt");
|
|
let mut finder = Pathfinder::from_file_str(file_str);
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
fn get_test_data() -> &'static str {
|
|
include_str!("test-input.txt")
|
|
}
|
|
|
|
#[test]
|
|
fn get_start_end() {
|
|
let finder = Pathfinder::from_file_str(get_test_data());
|
|
let (start, end) = finder.find_start_and_end();
|
|
|
|
assert_eq!((start, end), (0, 21));
|
|
}
|
|
}
|