HackerRank Backend Developer Intern Interview Questions and Answers

Basic DSA questions were asked.

Q1. Discussion over React fundamentals.
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Q1. Normal HR questions and negotiation
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Round 1 -> Coding interview -> ask 2 Leetcode problems
Round 2-> HR

Q1. DB Schema Design
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Q1. REST API, SQL and SOLID Principles
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Q1. Resume Based Round with Manager
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Q1. It was basically a salary negotiation round.
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Consist 3 coding questions medium level

Q1. Asked about java concept
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Q2. Sql query basics
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Q1. Asked medium to advance level oops java concept
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Q2. Deep discussion over project
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Q1. Hard level linked list questions
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Q2. Advanced level sql query
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Q1. Strings related coding question
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Q1. Files, os and db related questions
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Dsa questions asked and java basic questions

The aptitude test was in online mode. There were 20 mcq questions and 5 coding questions ranging from easy to hard

After the Aptitude test, the gd was kept in offline mode ( at office ), the topic was "the pros and cons of online classes

Q1. In the 1st technical round, basic questions regarding the languages which i have mentioned in resume was asked. I mentioned python and C in my resume and a coding problem was asked to solve and to further ...read more
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Q1. In the second technical OOPS concepts and DSA questions were asked
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Round duration - 60 minutes
Round difficulty - Easy

In the first inerview round, I was asked two problems, that were based on Data Structures. 

I realized a key point in this round : that sometimes, the interviewer is wrong, and you are right. Still, you should not argue with the interviewer, rather, just accept, and move on. 

This happened in the first coding problem itself, when, I actually used a "map" in c++. The interviewer asked me, to use an "unordered map" Instead of map, saying, that using an unordered map would make the insertion cost O(1) instead of O(log(n)). I refused to this by saying, that using unordered map is risky, as in case of a lot of collisions, it could go O(n). 

Still, the interviewer said, that I were wrong, and said that he had done some competitive programming himself, and he never faced a TLE verdict because of using unordered map. 

And I knew very well, that an Anti-Hash-Test could be created, to enforce a TLE verdict. The interviewer went on to saying that "every competitive programmer in the world would never use a map, rather, always use unordered map".

I slightly smiled to this, but agreed, and later cleared that interview, because of the smooth second problem.

Q1. 
Anagram Pairs Verification Problem
Your task is to determine if two given strings are anagrams of each other. Two strings are considered anagrams if you can rearrange the letters of one string to form the...read more
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Determine if two strings are anagrams of each other by checking if they can be rearranged to form the other string.
• Create a frequency map of characters for both strings and compare them.

• Sort both strings and compare them.

• Use a set to store characters and their counts for each string, then compare the sets.
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Q2. 
Distribute N Candies Among K People
Explanation: Sanyam wishes to distribute 'N' candies among 'K' friends. The friends are arranged based on Sanyam's order of likeness. He initially distributes candies s...read more
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Distribute N candies among K friends in Sanyam's order of likeness, incrementing distribution by K each round.
• Distribute candies starting from 1st friend, incrementing by K each round

• If remaining candies are fewer than what a friend is supposed to receive, stop distribution

• Output the number of candies each friend ends up with at the end of distribution
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Round duration - 60 minutes
Round difficulty - Medium

I were asked several questions involving DBMS. I was given data of patients of entire country, and was asked to make a dataBase for the same.

Q1. How would you create a database to store the data of all the patients in a country?
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