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问题：Given a linked list, return the node where the cycle begins. If there is no cycle, returnnull.Follow up:Can you solve it without using extra space?分析：在链表中查找环，并且判断起始位置，本能

OJ's undirected graph serialization:Nodes are labeled uniquely.We use # as a separator for each node, and , as a separator for node label and each neighbor of the node.As an example, consider th

问题描述：Given an integer n, return the number of trailing zeroes in n!.Note: Your solution should be in logarithmic time complexity.问题分析：一个2和一个5相乘就会产生一个0，阶乘过程中5的个数肯定会比2多例如： 5! =(2 * 2 * 2

问题描述：There are N gas stations along a circular route, where the amount of gas at stationi is gas[i].You have a car with an unlimited gas tank and it costs cost[i] of gas to travel from station

问题描述：There are N children standing in a line. Each child is assigned a rating value.You are giving candies to these children subjected to the following requirements:Each child must have at

问题描述：A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null.Return a deep copy of the list.解析：含有

问题：Given a string s and a dictionary of words dict, determine ifs can be segmented into a space-separated sequence of one or more dictionary words.For example, givens = "leetcode",dict = [

问题：Given an array of integers, every element appears twice except for one. Find that single one.Note:Your algorithm should have a linear runtime complexity. Could you implement it without usin

问题：Given a string s and a dictionary of words dict, add spaces ins to construct a sentence where each word is a valid dictionary word.Return all such possible sentences.For example, givens

问题：解析：由于

问题：Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and set.get(key) - Get the value (will always be positive) of th

问题：Sort a linked list in O(n log n) time using constant space complexity.思路：根据

这个题目比较容易，很像编译原理

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Given a 2D binary matrix filled with 0's and 1's, find the largest square containing all 1's and return its area.For example, given the following matrix:1 0 1 0 01 0 1 1 11 1 1 1 11 0 0 1 0