Given a sorted array and a target value, return the ind…

Implement strStr(). Return the index of the first occur…

Given a sorted array nums, remove the duplicates in-pla…

Merge two sorted linked lists and return it as a new li…

Given a string containing just the characters ‘(‘, ‘)’,…

Write a function to find the longest common prefix stri…

Given n pairs of parentheses, write a function to gener…

Given a linked list, remove the nth node from the end o…

Given a digit string, return all possible letter combin…

Given an array S of n integers, are there elements a, b…

罗马数字的计数规则 相同的数字连写、所表示的数等于这些数字相加得到的数、如：Ⅲ=3； 小的数字在大的数字的右边…

原题目: Given n non-negative integers a1, a2, …, an,…

Determine whether an integer is a palindrome. Do this w…

Implement atoi to convert a string to an integer. Hint:…

原题： Reverse digits of an integer. Example1: x = 123, re…

原题目： The string “PAYPALISHIRING” is written in a zigzag…

原题目： Given a string, find the length of the longest sub…

You are given two linked lists representing two non-neg…