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? Credits:Special thanks to @yukuairoy fo…
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? Credits:Special thanks to @dietpepsi for adding this problem and creating all test cases. 这道题让我们判断一个数是不是3的次方数,在Le…
Given an integer, write a function to determine if it is a power of two. Hint: Could you solve it in O(1) time and using O(1) space? 这道题让我们判断一个数是否为2的次方数,而且要求时间和空间复杂度都为常数,那么对于这种玩数字的题,我们应该首先考虑位操作 Bit Operation.在LeetCode中,位操作的题有很多,比如比如Repeated DNA Seque…
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? 题目标签:Bit Manipulation 这道题目让我们判断一个数字是不是4的…
Given an integer, write a function to determine if it is a power of two. Example 1: Input: 1 Output: true Example 2: Input: 16 Output: true Example 3: Input: 218 Output: false 给一个整数,写一个函数来判断它是否为2的次方数. 利用计算机用的是二进制的特点,用位操作,此题变得很简单. 2的n次方的特点是:二进制表示中最高位是…
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? Credits:Special thanks to @dietpepsi for adding this problem and creating all test cases. 给一个整数,写一个函数来判断此数是不是3的次方…
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? Credits:Special thanks to @yukuairoyfor…
题目:Power of Two Given an integer, write a function to determine if it is a power of two. 题意:判断一个数是否是2的k次方数. 思路: 2的次方数使用2进制表示则必然只有最高位是1其他都是0: 这样判断一个数最多需要循环32次就能得出结果. 则程序如下: bool isPowerOfTwo(int n){ if (!n)return false; while ((n&0x01) != 0x01){//2的次方…
1.从键盘输入两个整数,然后输出它们的平方值和立方值 在Java中,没有像C语言那样有一个专供接受键盘输入值的scanf函数,所以一般的做法是从键盘输入一行字符,保存到字符串s中,再将字符组成的字符串s转换为整型数据后返回 package mianshiti; import java.io.*; public class PrintResult { public static void main(String[] args) { Result result=new Result(); Syste…
