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Given a string s, find the longest palindromic subsequence's length in s. You may assume that the maximum length of s is 1000. 判断字符串中最长的回文子串，子串不一定要连续。 阅读全文
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In this problem, a tree is an undirected graph that is connected and has no cycles. The given input is a graph that started as a tree with N nodes (wi 阅读全文
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A website domain like "discuss.leetcode.com" consists of various subdomains. At the top level, we have "com", at the next level, we have "leetcode.com 阅读全文
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We are given an array A of positive integers, and two positive integers L and R (L <= R). Return the number of (contiguous, non-empty) subarrays such 阅读全文
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Given a string of numbers and operators, return all possible results from computing all the different possible ways to group numbers and operators. Th 阅读全文
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Write a program to find the node at which the intersection of two singly linked lists begins. For example, the following two linked lists: 寻找两个链表的交叉点。 阅读全文
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Given an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two elements 阅读全文
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Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). For example, the 32-bit 阅读全文
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一、什么是进程：进程是并发程序的一次执行过程，是并发程序在一个数据集合上的执行过程，是系统进行资源分配和调度的一个独立单位。 二、进程的特征： 1、动态性：进程的实质是程序的一次执行过程，因此，动态性是进程最重要的特性。进程由操作系统建立与撤消，具有一定的生命周期。它由“创建”而产生，由“调度”而执 阅读全文