update leetcode

leetcode_rs/problems/p50/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "p50"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

leetcode_rs/problems/p50/src/main.rs

@@ -0,0 +1,7 @@
+fn my_pow(x: f64, n: i32) -> f64 {
+    x.powi(n)
+}
+
+fn main() {
+    assert_eq!(my_pow(2.0, 10), 1024.0)
+}