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…
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…
[LeetCode]848. Shifting Letters 解题报告(Python) 标签(空格分隔): LeetCode 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.me/ 题目地址:https://leetcode.com/problems/shifting-letters/description/ 题目描述: We have a string S of lowercase letters, and an integer arr…
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 Reverse a singly linked list. Example: Input: 1->2->3->4->5->NULL Output: 5->4->3->2->1->NULL 题目分析及思路 给定一个单链表,要求得到它的逆序.可以使用列表对链表结点进行保存,之后新建一个列表对链表的逆序进行保存.最后返回新建列表的第一个元素即可. python代码 # Definition for singly-linked list. #…
Evaluate Reverse Polish Notation Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, /. Each operand may be an integer or another expression. Some examples:  ["2", "1", "+",…
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;…
[LeetCode]150. Evaluate Reverse Polish Notation 解题报告(Python) 标签: LeetCode 题目地址:https://leetcode.com/problems/evaluate-reverse-polish-notation/description/ 题目描述: Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operator…
LeetCode 2 Add Two Sum 解题报告 LeetCode第二题 Add Two Sum 首先我们看题目要求: You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return…