2022 ByteDance daily practice experience (Tiktok)

6 Month is too busy , I won't update the technical article this month , To share with you a ByteDance client experience , I hope that's helpful ~

Overall timeline

1. 6 month 6 Number , Push your resume on the official website of byte .6 No. In the evening 21 spot 02 branch ,HR Make a phone appointment , About 15 No. In the evening 17:00 interview .
2. 6 month 15 No. In the evening 17:00 one side , For an hour .
3. 6 month 16 At noon, 11:08 branch ,HR Call once , I have an appointment 6 month 20 No. In the evening 19 Two sides .
4. 6 month 20 The night of the March ,18:48 branch HR Little sister called to inform , The interviewer is in a meeting , Need to postpone 15 minute , Change it to 18:15 Two sides , Interview duration 75 minute .
5. 6 month 21 At noon, 11:20 about ,HR Little sister, add me to wechat , I thought happiness came , The result is to ask me for three meetings tomorrow -_-!. About 22 Afternoon of 18:00 Call for an interview .
6. 6 month 22 No. In the evening 18:00 On three sides , For an hour .
7. In the evening ,22 No. In the evening 8：20,HR Call , The process is over , I made an appointment tomorrow afternoon 16:00HR Noodles .
8. 23 Afternoon of 16:00HR Noodles , Duration 45 minute .
9. 24 At noon, 13:00 Know that the interview has passed ,offer Under approval .

one side ： Flying book video surface , An hour

Introduce yourself briefly

Challenging things encountered during the project

Pick two items on your resume

• First project ：

​ Light effect page download 20 Multi frame graph optimization scene ： Consider using a queue , Take several pictures at the same time , Instead of for loop .

​ Advertising page demand ： Flash screen file download time ？

• Another project , I simply asked where the chat data exists ？

SharedPreference internals , Why the performance is not good ？

Activity Life cycle of , One Activity Open another Activity The life cycle of experience , Start a transparent Activity Will experience the life cycle .

Activity The boot process .

Have you ever used a memory leak detection tool ？LeakCanary Introduce the principle ？ Why? LeakCanary To manually call once gc()？

GC Recycling mechanism ？

View Event distribution mechanism ？ The parent class intercepted down After the event , Can subclasses still receive events ？

Write a thread safe static inner class singleton .

Why not volatile Keywords will have thread safety problems ？

volatile How to guarantee the visibility and atomicity of keywords , What is the principle ？

Algorithm ： Rainwater collection

Ask questions ：

How did I do in the interview today ？

• Not bad , The foundation is very good .

What suggestions do you have for me or where I need to improve ？

• It's pretty good overall .

department base Where is the ？

When will the interview result come out ？

• etc. HR notice

Two sides , Flying book video surface ,75 minute

Introduce yourself briefly

Talking about projects , stay DNF What businesses have been done in the assistant project ？ Specific business scenarios ？

What image loading library is used for loading in the project ？ If you implement an image loading Library , How do you think ？

• Cache policy ： Memory + The local store .
  • How to clear expired pictures in your local ？ When caching pictures , The effective time of adding pictures to the cache path , The next time the user uses the image to load the Library , Clean up expired pictures .
• Thread pool

Does the project have a scenario of using lists （RecyclerView）,RecyclerView Let's talk about the internal principle of （ Cache policy ）？

For different types of children View,RecyclerPool Can cache pools be reused ？

• stay RecyclerPool in , Use a two-tier list to store reusable HolderView. The first floor goes through viewType Get the reuse list of the specified type . The second layer is the corresponding type of reusable holderView. The default size of the second level list is 5.
• So the answer is , Different types of holderView, Different cache pools are stored , Therefore, they cannot be reused .

You're using RecyclerView when , How to optimize RecyclerView Page performance ？

• Congzi View Of Xml Start with the structure , Think about how to optimize View The hierarchy of , Reduce View Measurement consumption . Try to cache the data that can be cached .
• If the page user slides very frequently , Customization may be required RecyclerView Cache pool size .

You just mentioned View Measurement consumption , Can you talk about how to optimize it in detail ？

​ - Try to reduce boys View The hierarchy of , Different ViewGroup Its measurement process is also different , such as , Simple layout LinearLayout Performance ratio of RelativeLayout Higher .

Then I asked View The measurement process of , top View Of MeasureSpec Objects and children View Of MeasureSpec How to create objects ？View What is the measurement process after measurement ？

Then two program questions ：

1. The first one is related to the task stack , Investigate Activity Start mode of ： In stack reuse mode ,taskAffinity attribute .
2. The second thread , Ask you how to make multiple threads execute sequentially .

From the second program question to Handler Mechanism , Chat Handler The principle of mechanism ？Handler And Looper Correspondence of ？

Last , An algorithm problem ：

Given an unordered array , The value will only have 1,2,3. Ask for in O(n) Sort the array in ascending order in time , Data structures cannot be added （ Array , Linked list ,map）, Allow new variables .

namely ：[1, 2, 3, 3, 2, 1, 3, 2, 1] -> [1, 1, 1, 2, 2, 2, 3, 3, 3].

The train of thought is ： Just put all the smallest 1 Move to the leftmost side of the array , Put all the biggest 3 Move to the far right of the array , It can satisfy one-time traversal to complete sorting . Maintain two indexes , The first index maintains the last one on the left of the array 1 Next position of , The second index maintains the first on the right of the array 3 The previous position of . Then traverse in sequence , Compare the values of elements , Then exchange .

Ask questions ：

What is the specific business of our department ？base Where exactly is Shenzhen ？

My interview performance ？

In the next few minutes , gossip , The interviewer asked , Are there any other companies at present , There are a few offer？

At present, I am studying a , How to arrange my internship time ？

On three sides , Flying book video surface , An hour

The third side , I can only say , The noodles are rotten .

It's just noodles 2 Algorithm questions , None of them are made together . It's not difficult , It's the thought that got stuck , I can't believe it , I collapsed. .

The first , Play poker , Take one at a time , Then put the next one at the back , Then draw the next one in sequence , Repeat the above operation . Until you finish playing cards in your hand .

There is another one in the middle ： every other k Elements , Rotate the linked list once . I will answer this question , But the interviewer said java There is no linked list , You have to do it yourself , It's troublesome , So I changed it .

The second way , Realize the root opening . Easy ！, I didn't write it out , I'm stupid ！ I'm really stupid ！

Three sides come down in an hour , There are only three questions left in my heart ： Who am I ？ Where am i? ？ Where am I going ？？

Wry smile, hahahaha ...

Ask questions ：

（ I'm stupid after meeting , I don't know what to ask , Asked two random questions , The interviewer saw that I was depressed , And comforted me , It will be seen from the results of other two sides , Not necessarily .）

My interview performance ？

Any suggestions ？

After the third side , Is this the end ？ did not ！！

I'm still doing poorly for the interview , Low mood , When you are ready to go out of the dormitory and find something to do , There is a call from Sichuan .

Sichuan phone ？ Who? ？ Could it be that a few days ago 618 I haven't picked up the express I bought , Brother, call me and let me get it ？

Whatever , Answer

“ feed , Hello ？”

“ EH , Hello , Is this Gu Jiaming ？ I'm Tiktok HR”

My heart , Um. ？！ Should not ？ Or did you send a thank-you letter so soon ？

“ Um. , Yes ”

“ Um. , Your interview process has been completed , Next, I'll make an appointment with you HR Noodles oh , Are you free tomorrow afternoon ？”

My heart ,！！！！！！！！！！！！！！！！！！！！

“ Wow, wow , I'm free tomorrow afternoon ！”

My god ！ I didn't expect there was another story ！ I must have performed well on the first two sides , My god ！！！！

Look at the picture to know my mood ~ Ha ha ha

HR Noodles , Flying book video surface ,45 minute

Mainly talking . Asked a lot of questions about the development project during the internship , For example, the difficulties you encounter when developing this project ？ How did you solve it ？ What impressed you in the development process ？ What to do in case of disagreement in the development process .

If time goes back to when you just started your internship, it will , What adjustments will you make ？

If two colleagues quarrel , What should you do at this time ？

What is your technical plan after you enter the company ？ You think after you enter bytes , How long does it take to get started ？

If you enter the company , Find that the people around you are better than you, or that you are not as good as you think , How would you react ？

For those who are better than you , How do you improve yourself to catch up with him ？ How to learn ？

If you enter byte internship , Your last internship , How does it help you practice in byte ？

How do you arrange your spare time ？

When can I start my internship , How long can I practice ？

Are there any other companies you are meeting now ？ Which companies did you vote for ？ There's something else in hand offer Do you ？

Ask questions

What is the working schedule of the company ？

24 The internship will last until next year , Is there any chance of becoming a regular ？

Last ,HR The next day , I learned at noon that the interview has passed , Check the application record process on the official website , Interview completed ：

 

Brother dei, If you think I wrote well , Please do me a favor

1. Give me some praise , Inspire me , At the same time, this article can be seen by more people ,(#^.#)
2. Don't have to Collection , Hey, don't order , Why did you order ？ I'm so sorry ！
3. Oh ！ also , I maintain a Routing Library .. Nothing else , Just mention , I maintain a Routing Library =.= !！

Come on come on , Thank you ！