Power of Four

 https://leetcode.com/problems/power-of-four/submissions/

class Solution {
public:
    bool isPowerOfFour(int n) {
        if(n <= 0){
            return false;
        }
        if(n & (n - 1)){
            return false;
        }
        return !(n & (0xAAAAAAAA)); // means ...10101010101010 and with n should be zero
    }
};

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