题目描述: Given an integer, convert it to a roman numeral. Input is guaranteed to be within the range from 1 to 3999. Subscribe to see which companies asked this question Show Tags Show Similar Problems 准备知识看上篇博客 leetcode之旅(10)-Roman to Integer 思路: 当前这个数…

题目介绍: Given two strings s and t, write a function to determine if t is an anagram of s. For example, s = "anagram", t = "nagaram", return true. s = "rat", t = "car", return false. Note: You may assume the string con…

LeetCode 第 231 题 (Power of Two) Given an integer, write a function to determine if it is a power of two. 这个题目有个特别简单的解法.当然.可以独自想出这种方法可不简单.这样的方法可以作为一个知识点记住就好了. class Solution { public: bool isPowerOfTwo(int n) { if(n <= 0) return false; return !(n &…

题目: 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? 思路: 这个问题是求一个数是不是3的次方数,可以有两种解法: 1.采用余数的算法 2.利用了java 的对数运算,判断3的对象是否实在整数,其中用到了换底公式 代码1 public class Solution {…

题目 Given an integer, write a function to determine if it is a power of two. Credits: Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases. 思路 判断一个整数,是不是的2的次方数 ,利用对2求余,来循环除以2,看最后是不是1 代码: public class Solution { pu…

LeetCode 第 342 题(Power of Four) 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? 题目非常eas…

326. Power of Three Question Total Accepted: 1159 Total Submissions: 3275 Difficulty: Easy 推断给定整数是否是3的某次方. 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? 完毕此题.…

这星期听别人说在做LeetCode,让他分享一题来看看.试了感觉挺有意思,可以培养自己的思路,还能方便的查看优秀的解决方案.准备自己也开始. 解决方案通常有多种多样,我觉得把自己的解决思路记录下来,阶段性查看,一定能对自己有帮助. 这是我做的第一题,所以记录也从这题开始,之后尽力以简短的说明,描述出思路,方便以后能回顾到简介明了的记录. 20. Valid Parentheses Given a string containing just the characters '(', ')', '{…

在此记录一下用javascript刷leetcode的过程,每天都要坚持! 1.Two Sum Given an array of integers, find two numbers such that they add up to a specific target number. The function twoSum should return indices of the two numbers such that they add up to the target, where in…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 字典统计每位数字出现的次数 日期 题目地址:https://leetcode.com/problems/reordered-power-of-2/description/ 题目描述 Starting with a positive integer N, we reorder the digits in any order (including the…