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Preface

This year, 9 month 10 month , Every day I brush the new interview questions in the group , Looking around the big factory interview in the group file , Every day's mood is like a song ,“ Eighteen corners of the mountain road ”. Click here for free , Code ：CSDN

I've seen other people's Tencent building , Imagine the feeling of Tencent building looking out .

I've been to Ali Hangzhou park during my freshman summer vacation , Worry about whether you have a chance to go again .

I really didn't expect myself to come to Tencent in confusion , Ali is here again .

One day , Dream come true , Think of a sentence in Ali Park ,“ Thank you for your hard work ”.

Interview

tencent （WXG Wechat payment ）

It was CSIG Cloud industry cluster , By accident WXG Wechat group picked up , Thank you for the coincidence .

Tencent resume （ Programming + 33 branch 35 second ）

1. Handwritten in Notepad OOP Implement a check-in program .
2. From a bunch of numbers O（n） Find non duplicate numbers .
3. string manipulation , Magic reform KMP.
4. Mathematical intelligence problems ,64 Before the horse is taken 8, Ask as soon as possible .11 Time .
5. Resume , Ask what the project did , The main technology stack .

Tencent side （41 branch 38 second ）

• Asked me deeply about the project .
• Thread pool , Connection pool , Their advantages .
• Java Common design patterns .
• Tell me about builder Builder pattern . This is not a good answer .
• TCP/UDP difference , When and what to use .
• UDP Realization TCP.
• To design a APP,TCP/UDP Specific application .
• Database index , Database engine .
• Direction of study , I said, C++/Java/Python More balanced .
• What has been done in the project of scientific and technological innovation .

Didn't give me a chance to ask questions , Maybe I'm too good .

Tencent on both sides （ Video interview ,75 minute , Mainly write code ）

1. ACM Complex rule simulation . You can use it here Java The chain of responsibility model , But I didn't answer when I asked , I've seen it and forgot .
2. Java GC. Start reciting balabala.
3. Parent delegate mechanism .
4. Four necessary conditions for deadlock ：
5. mutual exclusion ： A resource can only be used by one process at a time .
6. Request and hold conditions ： When a process is blocked by a request for resources , Keep the acquired resources .
7. Conditions of non deprivation : Resources obtained by the process , Before the end of use , Can't be forcibly deprived .
8. Loop wait condition : A circular waiting resource relationship is formed between several processes .
9. An exclusive lock , Shared lock and update lock .
10. What else do you want to ask . Asked about the technical atmosphere and learning situation .
11. XSS Inject the attack and understand No . No way .
12. SSH Sign in , I said for a long time , What's the name of this method . Think about it. , Asymmetric encryption .
13. How many hours does it take to implement a face recognition software ？
14. Tell the truth , This side of me is closing in , Some of them forget .

Tencent on three sides （ Wechat voice ）

1. Process scheduling , Process state switch .
2. How to use it? Java/C++ Implement thread pool , Specific measures .
3. Spring frame ,ORM frame Hibernate Tell me about .
4. IOC, AOP,IOC（ Inversion of control ） and DI（ Dependency injection ） What's the difference ,Java The reflex mechanism .
5. Adapter pattern (Adapter pattern), Bridging mode (Bridge pattern), Portfolio model (composite pattern)
6. Mainly ask me what technical direction I want to do .
7. Introduce the division of departments and personnel of Tencent .
8. HDFS, Paxos*** agreement ,zookeeper and redis A little bit .
9. oral offer

Alibaba

Ali side （38 branch 50 second ）

1. Self introduction. + Project introduction . Deep learning ,SSH frame ,C#,Java
2. You mentioned the connection pool ,druid Connection pool .
3. Common sorting algorithms . Quick line up , Merge two ways , Bubbling , Insert , Tournament ranking .topK problem .
4. TCP Three handshakes , Four waves .
5. Database engine comparison , Indexes .Innodb,Myisam and Memory Compared with ,B+ Trees ,hash,between operation ,left join operation .
6. Look at you ACM, You tell me a simple data structure , Answer and look up set and line segment tree .
7. How to ensure the atomicity of multithreading . Atomic classes , lock ,volitile Partial operation .
8. In depth asked optimistic lock , Pessimistic lock and its realization . I mentioned CAS, ABA But don't ask me hhh.
9. Python Fundamentals of machine learning .
10. How to solve the dependency problem .
11. zookeeper lock , Database isolation level .
12. docker Isolate deployment issues .
13. taobao What factors should be considered in query sorting ？ It's a difficult question , There's a lot to say , I guess I read machine learning on my resume , Answer the past consumption record , Search records , Collaborative filtering , clustering .
14. What can I add , We should consider the situation of the business side ,balabala.
15. What else do you want to ask .

summary ： The questions are fragmentary but comprehensive , It's easy to see a person's basic level of mastery .

Ali on both sides （45 branch 39 second ）

1. Self introduction. + Project introduction . Deep learning ,SSH frame ,C#,Java
2. What's your advantage over others in the project , It's when you use something that other people don't have .
3. What do you think about your abilities .ACM Ability . I thought I was going to type the code . Talk while you turn it on .
4. How do you learn ？
5. Draw a software execution process ,UML, ER.
6. Have you ever written development documents .
7. Java How to load a class , Load validation ready to parse initialization using unload , Parent delegate mechanism .bootstrap class loader,extend class loader Specifically .
8. linux Common commands .iftop,netstat,htop,apt,yum,source,corn,docker wait .
9. Tell me about docker.
10. MVC,MVVM contrast .
11. Spring Of IOC, AOP.
12. ORM frame Hibernate Tell me about .
13. Do you understand the design pattern ？
14. What else do you want to ask .

summary ： This side is regular , Didn't ask difficult questions , As long as you do try what your resume says , Should be able to answer .

Three sides of Ali （leader Noodles 18 branch 59 second + 24 branch 53 second ）

1. Make an appointment one day in advance
2. Tell me about the interview today 40 About minutes , Including self introduction , technical knowledge , Project experience .
3. Self introduction. . scholarship ,ACM, Deep learning , Traditional project development , Load balancing optimization, etc .
4. You maintain CSDN and Github primary coverage , brush ACM What's the situation .
5. Which of your basic knowledge is better ？ Every piece is very even ...
6. TCP How to realize reliable transmission over unreliable network transmission ？ Over time retransmission , The sliding window .TCP state .
7. TCP Timeout time ,RTT How to calculate .
8. 4G Switch Wifi When TCP How to achieve traffic change ？ Group loss , Fast retransmission , Quick recovery, etc . Routers, switches, queues .
9. common TCP optimization algorithm .TCP Congestion algorithm , Answer Google BBR And sharp speed principle and simple implementation .
10. operating system linux Kernel pair TCP The way to optimize ,HTTP1.0,1.1,2.0 Every version makes updates . state 100,host Field , Google browser 6 individual TCP Connections etc. , Supports long connections .
11. HTTP in cookie and session The difference between . Client server , Methods of representing users , Ban cookie What to do when .
12. On the basis of the previous article, we expanded the answer Redis.
13. session Storage data structure , For a single user set, Multiple users hashmap.
14. hashmap Principle ,key-value Calculation , Three ways of conflict resolution . Compared with bisection time complexity .rehash Make a ring .
15. hashtable Thread safety , Talk about the implementation of thread safety .
16. conCurrentHashmap and Hashmap In terms of performance, there are other optimizations besides segmented locking . I only answered the question of expansion in the paragraph .
17. High concurrency scenarios hashmap Use ,CAS,ABA problem .
18. The concepts and differences between parallelism and concurrency . Time slice , Context switch .
19. Database paradigm ,NoSQL Do you know ？
20. UML chart ,ER chart , flow chart .
21. Index of database , Left most prefix ,abc Three primary keys .
22. Cross table query common optimization ideas .

summary ： This person is very organized , It's a big guy , I'm typing the interview record all the time , The overall experience is still very good .

All around Ali （ Intersection Tmall supermarket ）

1. Self introduction. , After the introduction, let me confirm it again major , Education , Call to confirm .(?)

2. Tell me about your ACM experience .

3. Have you ever considered taking the postgraduate entrance examination ？ You can learn more from the enterprise . I started to get lost for a while , I can't hear what the other side says .

4. Compare postgraduate entrance examination with work .

5. How to balance work and leisure time .

6. What did you do in the deep learning program . Read the flower book , Watermelon book , Introduction to machine learning .

7. What can be used in this project , Night Cameras , Old photo restoration and so on .

8. You know Java Development framework ？SSH,SSM. Expanded dubbo,durid,rocketMQ,Netty. I have answered too many questions , It's been a long time .

9. volitile Keep memory visible , Prohibit command rearrangement ,***.

10. Memory barrier . Just say you don't know , God, I really don't understand ...

11. Tell me about rocketMQ, Priority queue ,Filter,Persistence,Reliablity.

12. How to do with message consistency . To guarantee idempotence .

13. Back to consumption . Retroactive consumption refers to Consumer The news of the success of consumption , Because the business needs to be re consumed .

14. wait(), sleep() difference .yield Method .

15. lock and synchronized contrast .

16. Reentrant lock , Biased locking , Lock coarsening .

summary ： The questions are very good , It's comprehensive and in-depth . But I'm too good , A few wrong answers .

Ali HR Noodles

1. Introduce yourself to ease the embarrassment .
2. ACM, What to learn , The paper .
3. Learning methods , Practice method .
4. What's the difference between junior high school algorithm competition and university competition .
5. How do you teach yourself .
6. How to balance work and study .
7. Flower Book , What are the main contents of the introduction to machine learning ？ It's a little bit shallow , however HR I asked a question .（HR Also know the technology , The fog ）
8. The contribution of the computer community you led during college .
9. In terms of social practice “ Top 10 teams ”, The whole activity content , The flow talks about .
10. Other routine questions .
11. I want to ask , Department personnel .
    
    

summary

stay 3 A few days in the month , Every day I worry about being picked up , What to do if you can't get an interview call ？ I didn't talk about hanging up ？ Why are you still in the resume pool ？

Why other people are not as good as I can get ashore . In fact, I'm not strong enough , I want to understand and go to study again . I have also arranged a lot of learning materials here , You can click here for free , Code ：CSDN

If you need the above information, you can click here to get it for free , Code ：CSDN