Billfree Labs Software Developer Intern Interview Questions and Answers

Round duration - 30 minutes
Round difficulty - Easy

I was asked about Polymorphism, which is a concept of OOP. I was given a problem and asked to solve it in as many different ways as possible.

Q1. Why is the use of a Database Management System (DBMS) recommended?
Ans. 
DBMS is recommended for efficient data storage, retrieval, and management.
• Ensures data integrity and consistency

• Provides data security through access control and encryption

• Supports concurrent access by multiple users

• Offers data backup and recovery mechanisms

• Enables efficient querying and indexing for faster data retrieval
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Q2. 
Minimum Operations to Make Strings Equal
Given two strings A and B consisting of lowercase English letters, determine the minimum number of pre-processing moves required on string A to make it equal to st...read more
Ans. 
The minimum number of pre-processing moves required on string A to make it equal to string B using specified operations.
• Iterate through both strings and count the number of differences between corresponding characters.

• For each difference, check if it can be resolved using the given operations.

• If the differences cannot be resolved, return -1; otherwise, return the total number of pre-processing moves needed.
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