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Instead of making the new instances of other classes, transferring the task of creatin...

In Java Collection, there are some data types to group variables for array is too limi...

Object-Oriented Programming, this is a programming mode, it means the programming is a...

Dependency Injection (DI) is a technique that transferring the task of creating the ob...

Hash Table : a data structure which organizes data using hash functions to support qui...

#707. Design Linked List (Singly Linked List) #141. Linked List Cycle #142. Linked Lis...

//1. initialize //2. get length //3. access element //4. iterate //5. modify //6. sort...

#24. Swap Nodes in Pairs #118. Pascal's Triangle #119. Pascal's Triangle II #206. Reve...

4:31[FrequencyOrder]TwoSumclassSolution{publicint[]twoSum(int[]nums,inttarget){Map<Int...

这个问题是容易被忽视的，但是我认为是最重要的，而且是会被99.99%被问到，这个问题是展现自己的机会，一定要抓住。 I’ve been working on softwar...

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2019.11.17LC217.ContainsDuplicates:ReviewontheHashMapFunction:...

simply consider different scenario of starting condition (i == j / i != j) and swap co...

double pointers, one slow one quick to test equal or not. actual question @ Lutron ons...

OA1已过，七道debug非常简单都是原题，OA2 coding 70min两道题。准备如下 Leetcode解法4，采用中心扩展法。 Given a matrix of ...

Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted ...

Write an efficient algorithm that searches for a value in an m x n matrix. This matrix...

Given an array of size n, find the majority element. The majority element is the eleme...

Given a non-empty array of integers, every element appears twice except for one. Finde...