function main() { const ws = fs.createWriteStream(process.env.OUTPUT_PATH); const sentence = readLine(); // const sentence = "b? Dl )B 4(V! A. MK, YtG ](f 1m )CNxuNUR {PG? " const result = howMany(sentence); ws.write(result + '\n'); ws.end(); }
Backend Engineer Interview Questions
15,493 backend engineer interview questions shared by candidates
Codility assessment: Minimum number of characters to delete from a string so that each character appears unique number of times. Note: You can delete all occurances of characters. eg: "aaaabbbb" -> 1 "a" or 1"b" would make "a" and "b" appear unique number of times. Given number in binary form, if its even -> you can divide it by 2; if its odd -> you can substract 1 from it. You can repeat above steps as many times as you want to reach 0. How many steps it took to reach zero? SQL question to select records from two tables using joins etc.
What was your motivation to apply to DTT?
Wat zijn je persoonlijke doelen die je wilt behalen met de stage?
You can prepare the following for the first round: 1. Basics of HTTP 2. Basics of Databases 3. Python Basics 4. Django Basics Questions Asked: 1. How does authentication work in Django 2. Various Types of Authentication Mechanism 3. Background of your work The interviewer went through the code and asked relevent questions. Third Round was a system design round: 1. Basic Introduction 2. The following question was asked Free Shipping( To be distributed to 10% users) By one Get One (To be distributes to 10% users) Flat 10% off (To be distributed to 80%) The tasks is to find a way to distribute the coupons such that in every checkout the user is provided with a coupon and this coupon should one of above three. There are multiiple users coming in your system and this distribution pattern should be mainitained in the system. 4. Asked questions of database locks during a flash sale. I was not able to answer the questions properly. I even forgot the SELECT FOR UPDATE thing :p. My suggestion is that the interview is not so difficult just be confident. Here is the solution for the ticket distribution.
Experience and your role with your past Projects?
I won't specify with the respect to the company's hiring processes. The 2 questions were "easy". After multiple requests to specify the context of the question (because based on that your answer can vary a lot), got nothing back but the repeated same question without any more details.
write a pseudocode for a given problem and some technical questions and design a system
1 : find the longest length substring in a given substring with no repeating characters. 2 : edit distance question from leetcode
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