Power of Three 带测试版

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public class Solution326 {     public boolean isPowerOfThree(int n) {          double temp = 10e-15;          if(n==0) return false;          double res = Math.log(n) / Math.log(3);          return Math.abs(res-Math.round(res)) < temp;  //或者Math.rint（）；    }      public static void main(String[]args)    {        int n=243;        System.out.println(isPowerOfThree(n));    }}

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