HackerEarth CS Intern Interview Questions and Answers

Equation, ratio and proportion

Q1. Question on anagram whether we can form with given strings
Add your answer
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
Answered by AI
Add your answer
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
Answered by AI
Add your answer
Q4. Range sum with the queries
Add your answer
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.
Answered by AI
Add your answer
Q6. React interviews hooks
Add your answer

Q1. DB Schema Design
Add your answer

Q1. REST API, SQL and SOLID Principles
Add your answer

Q1. Resume Based Round with Manager
Add your answer

Q1. It was basically a salary negotiation round.
Add your answer

Basic DSA questions were asked.

Q1. Discussion over React fundamentals.
Add your answer

Q1. Normal HR questions and negotiation
Add your answer

Round 1 -> Coding interview -> ask 2 Leetcode problems
Round 2-> HR

Q1. What is jdk, string related questions, basic java oops questions?
Add your answer

Q1. Normal question about past experience
Add your answer
Q2. When you can join and all
Add your answer

SQL test on Select query, insert, create

Q1. What are the main principles of the Java
Ans. 
Main principles of Java include object-oriented programming, platform independence, and automatic memory management.
• Object-oriented programming: Java is based on classes and objects, allowing for encapsulation, inheritance, and polymorphism.

• Platform independence: Java code can run on any platform that has a Java Virtual Machine (JVM) installed.

• Automatic memory management: Java uses garbage collection to automatically m
Answered by AI
Add your answer
Q2. What is the different between == and equals method
Ans. 
The == operator compares the memory addresses of two objects, while the equals method compares the content of two objects.
• The == operator is used to compare the memory addresses of two objects in Java.

• The equals method is used to compare the content of two objects in Java.

• Example: String str1 = new String("hello"); String str2 = new String("hello"); str1 == str2 will return false, but str1.equals(str2) will return true
Answered by AI
Add your answer