LeetCode - 326. Power of Three

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class  {public:    bool isPowerOfThree(int大专栏  LeetCode - 326. Power of Threepan> n) {        long long int a = 1;        while(a < n){            a *= 3;        }        return a == n;    }};

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class  {public:    bool isPowerOfThree(int n) {        return (n > 0 && log10(n)/log10(3) == int(log10(n)/log10(3)));    }};