IBE Media and Research Senior Data Scientist Interview Questions and Answers

Round duration - 120 Minutes
Round difficulty - Medium

Q1. 
Ninja and His Secret Information Encoding Problem
Ninja, a new member of the FBI, has acquired some 'SECRET_INFORMATION' that he needs to share with his team. To ensure security against hackers, Ninja dec...read more
Ans. 
The task is to encode and decode 'SECRET_INFORMATION' for security purposes and determine if the transmission was successful.
• Read the number of test cases 'T'

• For each test case, encode the 'SECRET_INFORMATION' and then decode it

• Compare the decoded string with the original 'SECRET_INFORMATION'

• Print 'Transmission successful' if they match, else print 'Transmission failed'
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Round duration - 60 Minutes
Round difficulty - Medium

Q1. 
Equilibrium Index Problem Statement
Given an array Arr consisting of N integers, your task is to find the equilibrium index of the array.
An index is considered as an equilibrium index if the sum of elem...read more
Ans. 
Find the equilibrium index of an array where sum of elements on left equals sum on right.
• Iterate through the array and calculate prefix sum and suffix sum at each index.

• Compare prefix sum and suffix sum to find equilibrium index.

• Return the left-most equilibrium index or -1 if none found.
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Round duration - 50 Minutes
Round difficulty - Easy

Q1. About Mainframe , Scenario Based mostly , DB2 Query
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Q1. Scenario Based , COBOL DB2 JCL VSAM CICS TOOLS , SQLCODES etc.
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Q1. Normal package discussion , location constraints
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Q1. Basic questions on testing.
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Q2. Write sample code on some basic queries supplied during interview.
Ans. 
Sample code for basic queries
• Use SELECT statement to retrieve data from a table

• Use WHERE clause to filter data based on conditions

• Use ORDER BY clause to sort data in ascending or descending order

• Use GROUP BY clause to group data based on a column

• Use JOIN clause to combine data from multiple tables
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