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2. Add Two Numbers   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 number

3. Longest Substring Without Repeating Characters Given a string, find the length of the longest substring without repeating characters. Examples: Given "abcabcbb", the answer is

在刷leetcode的时候，经常看到这个容器，好像整形数组都用的这个容器，为了方便之后的参考学习，现整理vector容器用法如下： 1.基本操作 (1)头文件#include. (2)创建vector对象，vector vec; (3)尾部插入数字：vec.push_back(a); (4)使用下标访问元素，cout (5)使用迭代器访问元素. v

Median of Two Sorted Arrays There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log

7. Reverse Integer   Question Editorial Solution  My Submissions Total Accepted: 165524Total Submissions: 696092Difficulty: Easy Reverse digits of an integer. Example1: 

第一题题目： Given 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 to the targe

5. 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, and there exists one unique longest pa