Grab the tail of gold, silver and silver, unlock the programmer interview "Artifact of Brushing Questions"

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Brush questions not only master knowledge, but also learn and progress quickly.

It's easier to handle interviews, especially some big companies like to ask algorithm questions, if you don't brush it, you won't be able to, and you will be passed.At the same time, brushing questions can cultivate sentiment and avoid Alzheimer's ??

?? 1. How to write questions

• Beginning novice, whether it is algorithm, SQL, or front-end problems, maybe not, then you can think about ideas first, and then look at problem solutions How does the great god in come true.

• For experienced quizzers, be sure to force yourself to come up with it!Then go to the solution, so that you can suddenly win the prize, have a deep memory, and truly master it.

?? 2. The path to brush questions

There are many websites for reviewing questions, and I recommend one I often use:

1. Algorithms (398 questions): 100 questions for interviews, introduction to algorithms, and high-frequency interview lists

2. SQL (82 questions): Quick Start, SQL Must Know, SQL Advanced Challenge, Interview Questions

3. Dachang Written Exam Questions: ByteDance, Meituan, Baidu, Tencent...

There are many topics, from shallow to deep, learning while brushing, covering all technical posts at the front and back ends. After targeted training, I dare to say that I will definitely offer a harvester.

Review path:

?? 3. A very beautiful SQL question

Known: the start time and end time of each reading of an article, find the maximum flow (PV) of this article

Follow the questions together!

Solution: We consider using the SUM window function to count the changes in the number of viewers in ascending order of timestamp according to the article id dimension

The requirements of this question are not difficult to understand, but the difficulty lies in how to calculate the instantaneous maximum count (the number of people watching)

First of all, we naturally think of the common encoding + simultaneous.The original table in_time and out_time are encoded here, in is the number of viewers + 1, and out is the number of viewers -1, perform two SELECTs in parallel, and arrange them in ascending order of artistic_id and ascending timestamp.

????SELECT??????artical_id,?in_time?dt,?1?diff????FROM?tb_user_log????WHERE?artical_id?!=?0????UNION?ALL????SELECT??????artical_id,?out_time?dt,?-1?diff????FROM?tb_user_log????WHERE?artical_id?!=?0????ORDER?BY?1,2

?? 4. More exciting

There are so many categories to brush up on.

• Algorithms

• SQL chapter

• SHELL

• Front end

• Syntax

• Famous Enterprise Written Exam Questions

• Verilog chapter

?? 5. Mock interview

In addition to quizzes, you can also conduct mock interviews.Even many big factories have interviews with Niu Ke.

?? 6. It's cool to brush the questions for a while, and it's always fun to brush it

Review path:

Niuke.com- Find a job artifact|Written exam question bank|Interview experience|Internship recruitment, one-stop solution for job-hunting and employment_Niuke.com

Let me introduce myself first. The editor graduated from Shanghai Jiaotong University in 2013. I worked in a small company and went to big factories such as Huawei and OPPO. I joined Alibaba in 2018, until now.I know that most junior and intermediate java engineers want to upgrade their skills, they often need to explore their own growth or sign up to study, but for training institutions, the tuition fee is nearly 10,000 yuan, which is really stressful.Self-learning that is not systematic is very inefficient and lengthy, and it is easy to hit the ceiling and the technology stops.Therefore, I collected a "full set of learning materials for java development" for everyone. The original intention is also very simple. I hope to help friends who want to learn by themselves but don't know where to start, and at the same time reduce everyone's burden.Add the business card below to get a full set of learning materials