LeetCode 326. 3的幂 Power of Three

class Solution {
public:
    bool isPowerOfThree(int n) {
        if (n < 1) return false;
        while (n % 3 == 0)
            n /= 3;
        return n == 1;
    }
};

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来源： https://www.cnblogs.com/ZSY-blog/p/12989732.html