impl Solution {
    pub fn minimize_xor(num1: i32, num2: i32) -> i32 {
        let n1 = num1.count_ones();
        let n2 = num2.count_ones();

        let mut result = num1;
        for _ in n1..n2 {
            result |= result + 1
        }

        for _ in n2..n1 {
            result &= result -1 
        }

        result
    }
}