n&(n-1);//n-1会将n中从小到大第一个为1的位置变成0,这样就能判断只有一个1的情况。 boolisPowerOfTwo(intn){//2的幂只有一个1,则使用n&(n-1)来统计1的个数returnn >0&& !(n & (n -1)); } 题目:Power of Three Given an integer, write a function to determine if it is a power ...
leetcode.com/problems/power-of-three/ 2.1)采用循环 class Solution: def isPowerOfThree(self, n: int) -> bool: if not n: return False while n: if n==1: return True if n%3: return False n //=3 return True Runtime: 80 ms, faster than 52.08% of Python3 online submissionsMemo...
Can you solve this real interview question? Power of Three - Given an integer n, return true if it is a power of three. Otherwise, return false. An integer n is a power of three, if there exists an integer x such that n == 3x. Example 1: Input: n
publicbooleanisPowerOfTwo(intn) {return(n>0)&&(n&(n-1))==0;//用位运算做题} 与之类似:power of three: publicbooleanisPowerOfThree(intn) {if(n<0||n==0)returnfalse;intremainder=n%3;ints=n/3;while(remainder==0){//remainder为0时继续做除法remainder=s%3; s=s/3; }if(s==0&&...
Given an integer (signed 32 bits), write a function to check whether it is a power of 4. Example: Given num = 16, return true. Given num = 5, return false. Follow up: Could you solve it without loops/recursion? 大意: 给出一个数字(有符号32位),写一个函数来检查它是不是4的次方数...
Leetcode 231. Power of Two (Python) Myron_yoo 21 0 Leetcode刷题 2 两数相加 Add Two Numbers JS老毕 2257 4 Leetcode力扣22 手画图解版|括号生成Generate Parentheses 爱学习的饲养员 4029 4 一周刷爆LeetCode,算法大神左神(左程云)耗时100天打造算法与数据结构基础到高级全家桶教程,直击BTAJ等一线...
LeetCode(65)-Power of Four 题目:Given an integer (signed 32 bits), write a function to check whether it is a power of 4. Example: Given num = 16, return true. Given num = 5, return false. Follow up: Could you solve it without loops/recursion?
【Leetcode】Power of Two 题目: Given an integer, write a function to determine if it is a power of two. 思路: 如果小于0,则不是2的n次幂。 否则则转为二进制,只有最高位为1,剩余为0的时候才是2的n次幂。 算法: AI检测代码解析 public boolean isPowerOfTwo(int n) {...
// // 而 3 是质数,所以 3 ^ x 的所有因数都是 3 的幂次方, // 即只有 3 ^ 0, 3 ^ 1, ..., 3 ^ 19 能整除 3 ^ 19 , // 所以只要 n 能整除 3 ^ 19 ,那么 n 就必定是 3 的幂次方。 return n > 0 && 1162261467 % n == 0 } 题目链接: Power of Three: leetcode.com/...
【Leetcode】Power of Four 题目链接:https://leetcode.com/problems/power-of-four/题目: Given an integer (signed 32 bits), write a function to check whether it is a power of 4. Example: Given num = 16, return true. Given num = 5, return false....