problem

​​231-power-of-two​​

 solution1

class Solution {
public:
    bool isPowerOfTwo(int n) {
        if(n==0) return false;
        while(n%2==0)
        {
            n /= 2;
        }
        return n==1;
    }
};

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solution2

class Solution {
public:
    bool isPowerOfTwo(int n) {
        if(n<=0) return false;
        return !(n&(n-1));
    }
};

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参考

1. ​​Leetcode_231-power-of-two​​;

完