leetcode 342. Power of Four

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Given an integer (signed 32 bits), write a function to check whether it is a power of 4.

Example:
Given num = 16, return true. Given num = 5, return false.

Follow up: Could you solve it without loops/recursion?

class Solution {public:    bool isPowerOfFour(int num) {        return (num & 1431655765) && ((num&num-1)==0);    }};

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