update leetcode

leetcode_rs/problems/p191/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "p191"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

leetcode_rs/problems/p191/src/main.rs

@@ -0,0 +1,7 @@
+fn hamming_weight(n: i32) -> i32 {
+    n.count_ones() as i32
+}
+
+fn main() {
+    assert_eq!(hamming_weight(11), 3);
+}