2024-06 rust p1

3 files changed, 64 insertions, 0 deletions

diff --git a/2024/06/rust/Cargo.lock b/2024/06/rust/Cargo.lock
new file mode 100644
index 0000000..a049cf0
--- /dev/null
+++ b/2024/06/rust/Cargo.lock
@@ -0,0 +1,14 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "aoc"
+version = "0.1.0"
+
+[[package]]
+name = "aoc_2024-06"
+version = "0.1.0"
+dependencies = [
+ "aoc",
+]
diff --git a/2024/06/rust/Cargo.toml b/2024/06/rust/Cargo.toml
new file mode 100644
index 0000000..f478719
--- /dev/null
+++ b/2024/06/rust/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "aoc_2024-06"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+aoc = { version = "0.1.0", path = "../../../lib/rust" }
diff --git a/2024/06/rust/src/main.rs b/2024/06/rust/src/main.rs
new file mode 100644
index 0000000..92ac02d
--- /dev/null
+++ b/2024/06/rust/src/main.rs
@@ -0,0 +1,43 @@
+use std::io;
+
+use aoc::grid::{Direction, Grid};
+use std::collections::HashSet;
+
+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 start = grid
+        .enumerate()
+        .filter(|(_, c)| **c == '^')
+        .next()
+        .unwrap()
+        .0;
+
+    let silver: usize = silver(&grid, start);
+    let gold: usize = gold(&grid);
+    println!("silver: {silver}");
+    println!("gold: {gold}");
+
+    return Ok(());
+}
+
+fn silver(grid: &Grid<char>, start: (usize, usize)) -> usize {
+    let mut pos = start;
+    let mut dir = Direction { x: 0, y: -1 };
+    let mut seen = HashSet::<(usize, usize)>::new();
+    loop {
+        seen.insert(pos);
+        match grid.move_pos(pos, dir, 1).and_then(|p| grid.at(p)) {
+            Some(&'#') => dir = dir.cw(),
+            Some(_) => pos = grid.move_pos(pos, dir, 1).unwrap(),
+            None => break seen.len(),
+        }
+    }
+}
+
+fn gold(grid: &Grid<char>) -> usize {
+    0
+}