add 1342

Author: cch123

S1342-number-of-steps-to-reduce-a-number-to-zero/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "S1342-number-of-steps-to-reduce-a-number-to-zero"
+version = "0.1.0"
+authors = ["Xargin <cao1988228@163.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

S1342-number-of-steps-to-reduce-a-number-to-zero/src/main.rs

@@ -0,0 +1,11 @@
+fn main() {
+    dbg!(Solution::number_of_steps(14));
+}
+
+struct Solution;
+
+impl Solution {
+    pub fn number_of_steps (num: i32) -> i32 {
+        (num.count_ones() * 2 - 1 + num.count_zeros() - num.leading_zeros()) as i32
+    }
+}