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|
mod utils;
use utils::read_input;
fn main() {
let input = read_input();
let mut grid: Vec<Vec<_>> = input
.lines()
.map(|x| {
x.chars()
.map(|x| (x.to_digit(10).unwrap() as u8, false))
.collect()
})
.collect();
in_all_directions!(check_vis_along_run, grid);
println!(
"Part 1: {}",
grid.iter()
.map(|x| x.iter().filter(|x| x.1).count())
.sum::<usize>()
);
let mut grid: Vec<Vec<(u8, u32)>> = grid
.into_iter()
.map(|x| x.into_iter().map(|(x, _)| (x, 1)).collect())
.collect();
in_all_directions!(vis_score_along_run, grid);
println!(
"Part 2: {}",
grid.iter()
.map(|row| row.iter().map(|(_, vis)| vis).max().unwrap())
.max()
.unwrap()
);
}
fn check_vis_along_run(
mut run: impl Iterator<Item = (usize, usize)>,
grid: &mut [Vec<(u8, bool)>],
) {
let mut curr_height = {
let (row_idx, col_idx) = run.next().unwrap();
grid[row_idx][col_idx].1 = true;
grid[row_idx][col_idx].0
};
for (row_idx, col_idx) in run {
let height = grid[row_idx][col_idx].0;
if height > curr_height {
curr_height = height;
grid[row_idx][col_idx].1 = true;
}
}
}
fn vis_score_along_run(run: impl Iterator<Item = (usize, usize)>, grid: &mut [Vec<(u8, u32)>]) {
let mut next_values = [0; 10];
for (row_idx, col_idx) in run {
let height = grid[row_idx][col_idx].0;
grid[row_idx][col_idx].1 *= next_values[height as usize];
for (val, score) in next_values.iter_mut().enumerate() {
*score = if *score == 0 || val > height as usize {
*score + 1
} else {
1
};
}
}
}
#[macro_use]
mod codegen {
#[macro_export]
macro_rules! in_all_directions {
($f:ident, $grid: ident) => {
let grid_rows = $grid.len();
let grid_cols = $grid[0].len();
(0..grid_rows).for_each(|grid_row| {
$f(
(0..grid_cols).map(move |grid_col| (grid_row, grid_col)),
&mut $grid,
);
$f(
(0..grid_cols)
.rev()
.map(move |grid_col| (grid_row, grid_col)),
&mut $grid,
)
});
(0..grid_cols).for_each(|grid_col| {
$f(
(0..grid_rows).map(move |grid_row| (grid_row, grid_col)),
&mut $grid,
);
$f(
(0..grid_rows)
.rev()
.map(move |grid_row| (grid_row, grid_col)),
&mut $grid,
)
});
};
}
}
|
