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Longest Substring Without Repeating Characters Medium Given a string, find the length of thelongest substringwithout repeating characters. Example 1: Input: "abcabcbb"Output: 3 Explanation: Th...

8.判断字符串是否回文（Palindrome Number） 例子1: Input: 121 Output: true 例子 2: Input: -121 Output: false 说明：从左到右，它显示为-121。 从右到左，它变成121-。 因此它不是回文。 例子3: Input: 10 Output: false 说明：从右到左读取01。 因此它不是回文。  ...

文章目录8.字符串转整型 （String to Integer (atoi)）说明样例1样例2样例3样例4样例 5实现代码Note:Example 1:Example 2:Example 3:Example 4:Example 5: 8.字符串转整型 （String to Integer (atoi)） 实现把字符串转成整型。 函数首先把所有的空格去掉直到第一个字符不是空格，然后取出一个正负号，...

LeetCode:7. Reverse Integer Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: 123 Output: 321 Example 2: put: -123 Output: -321 Example 3: Input: 120 Output: 21 Note...

6. ZigZag Conversion 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 leg...

Longest Palindromic Substring Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example 1: Input: “babad” Output: “bab” Note: “aba”...

4.Median of Two Sorted Arrays There are two sorted arraysnums1andnums2of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+...

You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return i...

**1. Two Sum(Easy)** Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you ...

10.表达式匹配（Regular Expression Matching） 给定参数字符串s和匹配表达式p,实现支持 . 和 * 的表达式匹配，需要匹配整个字符串（而不是其中一部分）。 说明 字符串s可以为空，可以只包含小写字母a-z。 匹配表达式p可以为空，可以只包含小写字母a-z，也可以是 . 或 * 。 例子1 输入: s=“aa” p=“a” 输出: false 说明: 匹配表示...