LeetCode/problems/rs/power-of-four.rs

impl Solution {
    pub fn is_power_of_four(n: i32) -> bool {
        if n == 0 {
            return false;
        }

        let mut x = n;

        while x % 4 == 0 {
            x >>= 2;
        }

        x == 1
    }
}