326. Power of Three
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Given an integer, write a function to determine if it is a power of three.
Example 1:
Input: 27 Output: true
Example 2:
Input: 0 Output: false
Example 3:
Input: 9 Output: true
Example 4:
Input: 45 Output: false
Follow up:
Could you do it without using any loop / recursion?
class Solution { public boolean isPowerOfThree(int n) { return Math.log10(n) / Math.log10(3) % 1 == 0; } }
真就一行啊
小数除以整数余数也是小数
0除以任何数余数都是0
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LeetCode----326. Power of Three(Java)