HackerRank Front end Engineer Interview Questions and Answers

1 hr test on HackerEarth platform, DSA questions

Q1. Question on anagram whether we can form with given strings
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Q2. Play random song from list without repetition
Ans. 
Use Fisher-Yates shuffle algorithm to play songs randomly without repetition.
• Create an array of songs

• Use Fisher-Yates shuffle algorithm to shuffle the array

• Play the first song in the shuffled array

• Remove the first song from the array

• Repeat steps 3-4 until all songs have been played
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Q3. Reverse the linked list
Ans. 
Reverse a linked list
• Iterate through the linked list and change the direction of the pointers

• Keep track of the previous, current, and next nodes

• Set the head of the linked list to the last node after reversing
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Q4. Range sum with the queries
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Q5. Hashing on 2d matrix counting max 1
Ans. 
Hashing algorithm to count maximum number of 1s in a 2D matrix.
• Create a hash table to store the count of 1s in each row.

• Traverse through each row and update the count in the hash table.

• Find the row with the maximum count of 1s in the hash table.

• Return the count of 1s in that row.
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Q6. React interviews hooks
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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