[?]*Power of Three

 

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

Follow up:Could you do it without using any loop / recursion?

 

 

public class Solution { public boolean isPowerOfThree(int n) { return n == 0 ? false : n == Math.pow(3, Math.round(Math.log(n) / Math.log(3))); } }

reference: https://leetcode.com/discuss/78481/java-one-line-solution-using-math-knowledge

转载于:https://www.cnblogs.com/hygeia/p/5123221.html