Day 6/7

src/4-printing-department.rs

@@ -1,14 +1,22 @@
-use std::{fs::File, io::{self, BufRead, BufReader}};
+use std::{
+    fs::File,
+    io::{self, BufRead, BufReader},
+};
 
 const NEIGHBOURS: [(i32, i32); 8] = [
-    (-1, -1), (0, -1), (1, -1),
-    (-1,  0),          (1,  0),
-    (-1,  1), (0,  1), (1,  1),
+    (-1, -1),
+    (0, -1),
+    (1, -1),
+    (-1, 0),
+    (1, 0),
+    (-1, 1),
+    (0, 1),
+    (1, 1),
 ];
 
 fn get_grid_cell(grid: &[Vec<bool>], x: i32, y: i32) -> bool {
     let (Ok(ux), Ok(uy)) = (usize::try_from(x), usize::try_from(y)) else {
-        return false
+        return false;
     };
     grid.get(uy)
         .and_then(|row| row.get(ux))
@@ -18,22 +26,26 @@ fn get_grid_cell(grid: &[Vec<bool>], x: i32, y: i32) -> bool {
 
 fn count_surrounding(grid: &[Vec<bool>], x: i32, y: i32) -> i32 {
     NEIGHBOURS
-    .iter()
-    .map(|(dx, dy)| get_grid_cell(grid, x + dx, y + dy))
-    .filter(|&p| p)
-    .count() as i32
+        .iter()
+        .map(|(dx, dy)| get_grid_cell(grid, x + dx, y + dy))
+        .filter(|&p| p)
+        .count() as i32
 }
 
 fn update_grid(grid: &[Vec<bool>]) -> Vec<Vec<bool>> {
     let height = grid.len();
     let width = grid[0].len();
-    (0..height).map(|y| {
-        (0..width).map(|x| {
-            let x = x as i32;
-            let y = y as i32;
-            get_grid_cell(grid, x, y) && (count_surrounding(grid, x, y) >= 4)
-        }).collect::<Vec<_>>()
-    }).collect::<Vec<_>>()
+    (0..height)
+        .map(|y| {
+            (0..width)
+                .map(|x| {
+                    let x = x as i32;
+                    let y = y as i32;
+                    get_grid_cell(grid, x, y) && (count_surrounding(grid, x, y) >= 4)
+                })
+                .collect::<Vec<_>>()
+        })
+        .collect::<Vec<_>>()
 }
 
 fn count_all_true(grid: &[Vec<bool>]) -> usize {
@@ -59,6 +71,9 @@ fn main() -> Result<(), io::Error> {
         last_grid = next_grid;
     }
 
-    println!("Result: {}", count_all_true(&original_grid) - count_all_true(&last_grid));
+    println!(
+        "Result: {}",
+        count_all_true(&original_grid) - count_all_true(&last_grid)
+    );
     Ok(())
-}
+}