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Given a linked list, determine if it has a cycle in it. Follow up:Can you solve it without using extra space? 带环链表的检测，使用快慢指针判断，快指针每次走两步，慢指针每次走一步，如果快慢指 阅读全文
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TCP的建立与终止 三次握手与四次挥手 TCP提供一种可靠、面向连接、字节流、传输层的服务。TCP是一种面向连接的单播协议。 一个TCP连接由一个4元组构成，它们分别是源IP地址和源端口号，目的IP地址和目的端口号。更准确的说，一个TCP连接是由一对端点或套接字构成，其中通信的每一端都由一对（IP地 阅读全文
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Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra space fo 阅读全文
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Determine whether an integer is a palindrome. Do this without extra space. Some hints: Could negative integers be palindromes? (ie, -1) If you are thi 阅读全文
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We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number I picked. Every time you guess wron 阅读全文
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Given an integer n, return the number of trailing zeroes in n!. Note: Your solution should be in logarithmic time complexity. 计算n!结果的末尾有几个零。 题目要求复杂度为对 阅读全文
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Implement the following operations of a queue using stacks. push(x) -- Push element x to the back of queue. pop() -- Removes the element from in front 阅读全文
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You have a total of n coins that you want to form in a staircase shape, where every k-th row must have exactly kcoins. Given n, find the total number 阅读全文
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Count the number of segments in a string, where a segment is defined to be a contiguous sequence of non-space characters. Please note that the string 阅读全文
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const限定符 因为const对象一旦创建后其值就不能再改变，因此const对象必须初始化。 如果利用一个对象初始化另外一个对象，则它们是不是const都无关紧要。 通过以上初始化操作可知：const的常量特征仅仅在执行改变其值的操作时才会发挥作用。 默认情况下，const对象被设定为仅在文件内有 阅读全文