Leetcode 342 Power of Four幾個C++一行解

Leetcode 342  Power of Four幾個C++一行解

[codes on Leetcode]https://leetcode.com/problems/power-of-four/solutions/7081839/9-ways-of-bit-manipulation-1-liner-beats-100/

[bit/ bitmask playlist]https://www.youtube.com/watch?v=Hw1fnQA8Nk8&list=PLYRlUBnWnd5K8FlzJ6tOswqQcsk7R1Duh