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Improve perf of day 4

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This commit is contained in:
Tyler Hallada
2025-12-05 01:25:14 -05:00
parent 8f4bc5b802
commit 9de4d77a63
2 changed files with 22 additions and 18 deletions
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38
src/day04/mod.rs
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@@ -8,6 +8,17 @@ use tracing::{debug, instrument};
pub const INPUT: &str = include_str!("input/input.txt");
const ADJACENT_DELTAS: [(isize, isize); 8] = [
(-1, -1),
(-1, 0),
(-1, 1),
(0, -1),
(0, 1),
(1, -1),
(1, 0),
(1, 1),
];
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum Cell {
Empty,
@@ -77,14 +88,6 @@ impl<const R: usize, const C: usize> Display for Grid<R, C> {
}
impl<const R: usize, const C: usize> Grid<R, C> {
fn get_cell(&self, row: isize, col: isize) -> Option<Cell> {
if row >= 0 && col >= 0 && (row as usize) < R && (col as usize) < C {
Some(self.cells[row as usize][col as usize])
} else {
None
}
}
fn count_accessible_papers(&mut self, replace_with: Cell) -> usize {
let mut count = 0;
for row in 0..R {
@@ -93,15 +96,16 @@ impl<const R: usize, const C: usize> Grid<R, C> {
continue;
}
let mut adjacent_papers = 0;
for dr in -1..=1 {
for dc in -1..=1 {
if dr == 0 && dc == 0 {
continue;
}
let adjacent = self
.get_cell(row as isize + dr, col as isize + dc)
.unwrap_or(Cell::Empty);
if adjacent == Cell::Paper || adjacent == Cell::AccessiblePaper {
for &(dr, dc) in &ADJACENT_DELTAS {
let adj_row = row as isize + dr;
let adj_col = col as isize + dc;
if adj_row >= 0
&& adj_col >= 0
&& (adj_row as usize) < R
&& (adj_col as usize) < C
{
let adjacent = self.cells[adj_row as usize][adj_col as usize];
if matches!(adjacent, Cell::Paper | Cell::AccessiblePaper) {
adjacent_papers += 1;
}
}