IT 技术分享

Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists. 合并两个已排好序的数组 代码 #include using namespace

问题描述 Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in

问题描述 Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 罗马数字转数字，如VII=7 只要了解规则 [http://baike.baidu.com/link?url=x4oib22b_

问题描述 Determine whether an integer is a palindrome. Do this without extra space. Could negative integers be palindromes? (ie, -1) If you are thinking of converting the integer to string, note the restriction

问题描述 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

问题描述 Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321 问题分析 题目不难，稍微麻烦的是整型溢出。比如1234567899，倒过来是9987654321，但现在已经超出了整型的最大数了，所以，针对整型溢出需要做一定处理。 代码 class Solution { public: int reverse(int x) { int

问题描述 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 palindromic substring. 给定一个字符串S，找到最长的回文子串（

问题描述 Given a string, find the length of the longest substring without repeating characters. Examples: Given "abcabcbb", the answer is "abc", which the length is 3. Given "bbbbb", the answer is "b", with

问题描述 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