79. Word Search 题目 Given a 2D board and a word, find if the word exists in the grid. The word can be construct…

  You are given an integer array sorted in ascending order (may contain duplicates), you need to split th…

题目： Given an array S of n integers, are there elements a, b, c in …

题目地址：https://leetcode-cn.com/probl…题目描述：给定一个链表，返回链表开始入环的第一个节点。 如果链表无环，则返回 null。 为了表示给定链表中的环，我们使用整数 pos 来…

Follow up for “Unique Paths”: Now consider if some obstacles are added to the grids. How many uniq…

1 题目描述 Given a matrix of m x n elements ( m rows, n columns), return all elements of the matrix in spiral orde…

Problem More LeetCode Discussions Factory is design pattern in common usage. Implement a ShapeFactory that can…

文章作者：Tyan 博客：noahsnail.com  |  CSDN  |  简书 |   云+社区 1. 枚举 枚举是基于逐个尝试答案的一种问题求解策略。 2. 完美…

本题考察的是动态规划 题目描述 给定一个非空字符串 s 和一个包含非空单词列表的字典 wordDict，判定 s 是否可以被空格拆分为一个或多个在字典中出现的单词。 说明： 拆分时可以重复使用字典中的单词。 你可以假设字…

Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. push(x) R…

Problem Given an m * n matrix M initialized with all 0‘s and several update operations. Operations are r…

  Given a nested list of integers, implement an iterator to flatten it. Each element is either an integer…