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题目：Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without repeating letters for "abcabcbb" is "abc", which the length is 3.

罗马数字和现在使用的阿拉伯整数之间的转换在LeetCode上一共有两道题目：Roman to Integer 和Integer to Roman 如标题所说的，这是个简单的字符串处理的题目，基本上知道了规则就可以直接写出代码解决了。罗马数字基本规则做好这道题目的前提是知道一些罗马数字的基本规则。

题目原文:Determine whether an integer is a palindrome. Do this without extra space.click to show spoilers.Some hints:Could negative integers be palindromes? (ie, -1)If you are thinking of conv

题目原文Implement atoi to convert a string to an integer.Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible in

题目Reverse digits of an integer.Example1: x = 123, return 321Example2: x = -123, return -321click to show spoilers.Have you thought about this?Here are some good questions to ask

题目:The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)P A H NA

题目再现There are two sorted arrays A and B of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)).题意解析

题目原文：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 it

题目原文：Given a string S, find the longest palindromic substring in S. You may assume that the maximum length ofS is 1000, and there exists one unique longest palindromic substring.题意解析：最长回文子串。就是

题目还原Two SumGiven 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 t

这个也是简单题目，但是关键在于题意的理解。 题目原文就一句话:Write a function to find the longest common prefix string amongst an array of strings. 题意是给一个字符串数组，找出这个字符串数组中所有字符串的最长公共前缀。 注意是限定的前缀，而不是子串。