题目: Write a function that takes a string as input and returns the string reversed. Example: Given s = "hello", return "olleh". 思路: 题意:反转字符串 不用考虑为空的情况,这种情况sb.toString()也是null,倒叙遍历,StringBuffer相加 代码: public class Solution { public String…

原题地址: 344 Reverse String: https://leetcode.com/problems/reverse-string/description/ 541 Reverse String II: https://leetcode.com/problems/reverse-string-ii/description/ 题目&&解法: 1.Reverse String: Write a function that takes a string as input and ret…

Given a string and an integer k, you need to reverse the first k characters for every 2k characters counting from the start of the string. If there are less than k characters left, reverse all of them. If there are less than 2k but greater than or eq…

Write a function that reverses a string. The input string is given as an array of characters char[]. Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory. You may assume all the…

题目描述 编写一个函数,其作用是将输入的字符串反转过来. 示例 1: 输入: "hello" 输出: "olleh" 示例 2: 输入: "A man, a plan, a canal: Panama" 输出: "amanaP :lanac a ,nalp a ,nam A" 思路 思路一: 逆序拼接字符串 思路二: 依次交换两边的值 思路三: 直接调用StringBuilder 的 reverse() 思路四: 用栈来实现反…

344. Reverse String 最基础的旋转字符串 class Solution { public: void reverseString(vector<char>& s) { if(s.empty()) return; ; ; while(start < end){ char tmp = s[end]; s[end] = s[start]; s[start] = tmp; start++; end--; } return; } }; 541. Reverse Strin…

题目描述 LeetCode 344. 反转字符串 请编写一个函数,其功能是将输入的字符串反转过来. 示例 输入: s = "hello" 返回: "olleh" Java 解答 class Solution { public String reverseString(String s) { if (s == null || s.length() <= 1) { return s; } char[] arr = s.toCharArray(); int leng…

题意:反转字符串,用好库函数. class Solution { public: string reverseString(string s) { reverse(s.begin(),s.end()); return s; } };…

Problem: Write a function that takes a string as input and returns the string reversed. Example: Given s = "hello", return "olleh". 此题一般思路为:在原数组上直接对s[i]以及s[len-i-1]进行调换即可. char* reverseString(char* s) { , len = ; len = strlen(s); ; i &…

题目描述: Write a function that takes a string as input and returns the string reversed. Example:Given s = "hello", return "olleh". 解题思路: 见代码. 代码如下: class Solution(object): def reverseString(self, s): """ :type s: str :rtype…