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211. Add and Search Word - Data structure design

Design a data structure that supports the following two operations: void addWord(word) bool search(word) search(word) can search a literal word or a ...

2019-04-29

0 512

210. Course Schedule II

There are a total of n courses you have to take, labeled from 0 to n-1. Some courses may have prerequisites, for example to take course 0 you have to...

2019-04-29

0 556

208. Implement Trie (Prefix Tree)

Implement a trie with insert, search, and startsWith methods. Example: Trie trie = new Trie(); trie.insert("apple"); trie.search("ap...

2019-04-29

0 661

207. Course Schedule

There are a total of n courses you have to take, labeled from 0 to n-1. Some courses may have prerequisites, for example to take course 0 you have to...

2019-04-29

0 462

201. Bitwise AND of Numbers Range

待续。。。

2019-04-29

0 446

200. Number of Islands

Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacen...

2019-04-28

0 437

188. Best Time to Buy and Sell Stock IV

Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may compl...

LeetCode

2019-04-28

0 2620

180. Consecutive Numbers

Write a SQL query to find all numbers that appear at least three times consecutively. +----+-----+ | Id | Num | +----+-----+ | 1 | 1 | | 2 | 1 ...

2019-04-28

0 491

178. Rank Scores

Write a SQL query to rank scores. If there is a tie between two scores, both should have the same ranking. Note that after a tie, the next ranking num...

2019-04-28

0 585

177. Nth Highest Salary

Write a SQL query to get the nth highest salary from the Employee table. +----+--------+ | Id | Salary | +----+--------+ | 1 | 100 | | 2 | 200 ...

2019-04-28

0 500