Given an integer, write a function to determine if it is a power of two

Given an integer, write a function to determine if it is a power of two.

判断一个整数是不是2的次方：

class Solution {
public:bool isPowerOfTwo(int n) {int cnt = 0;while (n > 0) {cnt += (n & 1);n >>= 1;}return cnt == 1;}
};

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Given an integer, write a function to determine if it is a power of two

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