package isPowerOfThree326; /* Given an integer, write a function to determine if it is a power of three. */ public class Solution { /* //题目理解错误,理解成3次开方 public static boolean isPowerOfThree(int n) { if (n==1) return true; else{ for(int i=2;i<=Math.sqr…

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) { int num=n; while(num>0&&num%3==0) num/=3; re…

题目大意: 让你判断一个int是否为3的幂; 最简单的思路 C++ class Solution { public: bool isPowerOfThree(int n) { for(long long i=1;i<=n;i=i*3LL) { if(i==n) return true; } return false; } }; Python 第一种写法-很低效..因为不会类似C++的for.. class Solution(object): def isPowerOfThree(self, n)…

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…

public class Solution { public bool IsPowerOfThree(int n) { && ( % n == ); } } https://leetcode.com/problems/power-of-three/#/description…

1.2的幂 正确写法: class Solution { public: bool isPowerOfTwo(int n) { ) return false; )) == ; } }; 错误写法1: &符号的短路原则,如果&前面为false了就不会计算后面的了 class Solution { public: bool isPowerOfTwo(int n) { ) return false; retur class Solution { public: bool isPowerOfFou…

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? /************************************************************************* > File Name: LeetCode3…