Given a string S, return the "reversed" string where all characters that are not a letter stay in the same place, and all letters reverse their positions. Example 1: Input: "ab-cd" Output: "dc-ba" Example 2: Input: "a-bC…

https://leetcode.com/problems/reverse-only-letters/ Given a string S, return the "reversed" string where all characters that are not a letter stay in the same place, and all letters reverse their positions.   Example 1: Input: "ab-cd"…

题目要求 Given a string S, return the "reversed" string where all characters that are not a letter stay in the same place, and all letters reverse their positions. 题目分析及思路 给定一个字符串,返回“reversed”后的字符串,要求非字母的字符保留原来的位置,字母字符逆序排列.可以先获得原字符串中的全部字母字符列表,然后遍历原字…

题目标签:String 利用left, right 两个pointers, 从左右开始 互换 字母.如果遇到的不是字母,那么继续移动到下一个. Java Solution: Runtime beats 29.87% 完成日期:12/08/2018 关键点:two pointers class Solution { public String reverseOnlyLetters(String S) { char[] charArr = S.toCharArray(); int left = 0;…

problem 917. Reverse Only Letters solution: class Solution { public: string reverseOnlyLetters(string S) { , j=S.size()-; i<j; )//err... { if(!isalpha(S[i])) i++; else if(!isalpha(S[j])) j--; else { char tmp = S[i]; S[i] = S[j]; S[j] = tmp; i++; j--;…

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 栈 单指针 双指针 日期 题目地址: https://leetcode.com/contest/weekly-contest-105/problems/reverse-only-letters/ 题目描述 Given a string S, return the "reversed" string where all characters…

Given a string S, return the "reversed" string where all characters that are not a letter stay in the same place, and all letters reverse their positions.   Example 1: Input: "ab-cd" Output: "dc-ba" Example 2: Input: "a-…

Given a string s, reverse the string according to the following rules: All the characters that are not English letters remain in the same position. All the English letters (lowercase or uppercase) should be reversed. class Solution { public: string r…

Leetcode 25. Reverse Nodes in k-Group 以每组k个结点进行链表反转(链表) 题目描述 已知一个链表,每次对k个节点进行反转,最后返回反转后的链表 测试样例 Input: k = 2, 1->2->3->4->5 Output: 2->1->4->3->5 Input: k = 3, 1->2->3->4->5 Output: 3->2->1->4->5 详细分析 按照题目要求…

Reverse a linked list from position m to n. Do it in one-pass. Note: 1 ≤ m ≤ n ≤ length of list. Example: Input: 1->2->3->4->5->NULL, m = 2, n = 4 Output: 1->4->3->2->5->NULL 这个题目是在[LeetCode] 206. Reverse Linked List_Easy tag…