3 files changed, 121 insertions, 0 deletions
diff --git a/2025/01/rust/Cargo.lock b/2025/01/rust/Cargo.lock
new file mode 100644
index 0000000..15ca0d7
--- /dev/null
+++ b/2025/01/rust/Cargo.lock
@@ -0,0 +1,89 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "aoc_2025-01"
+version = "0.1.0"
+dependencies = [
+ "num",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
+
+[[package]]
+name = "num"
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+checksum = "35bd024e8b2ff75562e5f34e7f4905839deb4b22955ef5e73d2fea1b9813cb23"
+dependencies = [
+ "num-bigint",
+ "num-complex",
+ "num-integer",
+ "num-iter",
+ "num-rational",
+ "num-traits",
+]
+
+[[package]]
+name = "num-bigint"
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+dependencies = [
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-complex"
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+dependencies = [
+ "num-traits",
+]
+
+[[package]]
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+ "num-traits",
+]
+
+[[package]]
+name = "num-iter"
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+dependencies = [
+ "autocfg",
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-rational"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "num-bigint",
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-traits"
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+dependencies = [
+ "autocfg",
+]
diff --git a/2025/01/rust/Cargo.toml b/2025/01/rust/Cargo.toml
new file mode 100644
index 0000000..901af57
--- /dev/null
+++ b/2025/01/rust/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "aoc_2025-01"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+num = { version = "0.4.3", features = ["num-bigint"] }
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}");
+}