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

8.判断字符串是否回文（Palindrome Number）例子1:Input: 121Output: true例子 2:Input: -121Output: 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: 10Output: 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 IntegerGiven a 32-bit signed integer, reverse digits of an integer.Example 1:Input: 123Output: 321Example 2:put: -123Output: -321Example 3:Input: 120Output: 21Note...

6. ZigZag ConversionThe 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 SubstringGiven 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 ArraysThere 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...