25-01 rust both

1 files changed, 25 insertions, 0 deletions

diff --git a/2025/01/rust/src/main.rs b/2025/01/rust/src/main.rs
new file mode 100644
index 0000000..72b718b
--- /dev/null
+++ b/2025/01/rust/src/main.rs
@@ -0,0 +1,25 @@
+use num::BigUint;
+use std::io;
+
+fn main() {
+    let mut curr = 50;
+    let mut silver: u64 = 0;
+    let mut gold: BigUint = BigUint::ZERO;
+    io::stdin()
+        .lines()
+        .flatten()
+        .map(|line| match line.split_at(1) {
+            ("L", n) => -n.parse::<i64>().unwrap(),
+            (_, n) => n.parse::<i64>().unwrap(),
+        })
+        .for_each(|n| {
+            let prev = curr;
+            curr += n;
+            gold += (curr.abs() / 100) as u64 + (prev != 0 && curr <= 0) as u64;
+            curr = curr.rem_euclid(100);
+            silver += (curr == 0) as u64;
+        });
+
+    println!("silver: {silver}");
+    println!("gold: {gold}");
+}