2024-04 rust p1

1 files changed, 35 insertions, 0 deletions

diff --git a/2024/04/rust/src/main.rs b/2024/04/rust/src/main.rs
new file mode 100644
index 0000000..fd6a715
--- /dev/null
+++ b/2024/04/rust/src/main.rs
@@ -0,0 +1,35 @@
+use aoc::Grid;
+use std::io;
+
+fn main() -> io::Result<()> {
+    let grid: Vec<Vec<char>> = io::stdin()
+        .lines()
+        .map(|line| line.unwrap().chars().collect())
+        .collect();
+    let grid = Grid::new(grid);
+
+    let silver: usize = silver(&grid);
+    let gold: u64 = 0;
+    println!("silver: {silver}");
+    println!("gold: {gold}");
+
+    return Ok(());
+}
+
+fn silver(grid: &Grid<char>) -> usize {
+    let dirs = [
+        (1, 1),
+        (1, 0),
+        (1, -1),
+        (0, 1),
+        (0, -1),
+        (-1, 1),
+        (-1, 0),
+        (-1, -1),
+    ];
+    grid.points()
+        .flat_map(|p| dirs.into_iter().map(move |dp| grid.ray(p, dp)))
+        .map(|cs| cs.zip("XMAS".chars()).all(|(&a, b)| a == b))
+        .filter(|p| *p)
+        .count()
+}