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题目描述：Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two ... 阅读全文
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题目描述：Implement regular expression matching with support for'.'and'*'.'.' Matches any single character.'*' Matches zero or more of the preceding elemen... 阅读全文
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题目描述： Determine whether an integer is a palindrome. Do this without extra space.solution1: //依次比较高位和低位数字是否相同bool isPalindrome(int x) { if(x... 阅读全文
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最近在接触软件注册模块，需要获取硬盘序列号来生成注册码。 硬盘序列号，英文名：Hard Disk Serial Number，该号是硬盘厂家为区别产品而设置的，是唯一的。网上搜索一下，发现获取硬盘序列号的代码遍地都是，但很多是错误的。典型代表就是使用GetVolumeInformation函数获取序 阅读全文
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题目描述：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 be... 阅读全文
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题目摘要：Reverse digits of an integer.Example1: x = 123, return 321Example2: x = -123, return -321 这道题不算难，主要是要考虑"反转后的值可能越界"这一种情况。(此题起初设计时，未考虑这种情况，因此网上很多旧... 阅读全文
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题目描述：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 ... 阅读全文
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题目描述：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 l... 阅读全文
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使用递归可以非常方便地实现二叉树的遍历。如果不使用递归呢，请听我一一道来。首先给出二叉树遍历的递归版本：struct BTNode { char data; BTNode *lchild, *rchild;};void visit(BTNode *p){ coutdatalch... 阅读全文
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题目描述：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 si... 阅读全文