OPERA Interview Questions, Process, and Tips

Round duration - 60 Minutes
Round difficulty - Easy

Interviewer started with asking me about myself and my family background then he asked me about my preffered location for job , i told him Delhi NCR so he then asked me why Delhi NCR ? He had my written test answer sheet with him , i had left few Dbms question due to limited time in written test , he told me to solve them. Then he asked me about my area of interests ( Data Structures , OOPS , Operating System ) and he asked me , ” What do you mean by loosely coupled?” i explained it well , he was satisfied.
Then he asked me , ” Do you have any question for me ?”. I asked him about work culture in opera solutions , what are the career opportunities and what technologies opera use.
I was selected for next round.

Q1. Pair Sum
You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to return the list of all pairs of elements such that each sum of elements of each pair eq...read more
Ans. Brute Force
• Initialize a list to store our results.
• For each element in the array 'ARR[i]', check if ('ARR[i]' + ‘ARR[j]’), equals to given sum or not, where ‘i’ < ‘j’ < ‘N’.
• If the condition matches, add the pair('ARR[i]', ‘ARR[j]’) to the list. Sort the list of pairs as per the given output format and return this list.
Space Complexity: O(1)Explanation:
O(1).
 
Constant extra space is required.
Time Complexity: O...read more
Answered by CodingNinjas
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Round duration - 90 Minutes
Round difficulty - Easy

gave me 2 coding question and 1 system designing question to solve.

Q1. Product Array Puzzle
You are given an array of ‘N’ integers. You need to return another array ‘product’ such that ‘product[i]’ contains the product of all the arrays except the element at the ith position ...read more
Ans. Brute Force
1. For each element, we need to find the product of all elements except the current element in the given array. We will create a ‘product’ array for storing the answer for each element.
2. For each element, we run a loop and store the product of all elements in the array but as soon as we reach the index of the current element we should not include this in our product.
3. After the loop is over we set the value of prod...read more
Answered by CodingNinjas
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Q2. Game of 3
The Ultimate Ninja Ankush was bored, so his friend Ninja Nikhil decided to give him a puzzle to keep him entertained. Nikil gave Ankush ‘N’ integers and asked how many groups of sizes 2 and 3 can...read more
Ans. Storing the remainders.
The idea is to see the remainder of every element when divided by 3. A set of elements can form a group only if the sun of their remainder is multiple of 3. Therefore we can see that for making a group of 2, we will combine the number with remainder only 0 or combine numbers with remainder 1 & 2. For making a group of 3, we can take the remainder 1 & 2 & 0 or all 0 or all 2 or all 1.&...read more
Answered by CodingNinjas
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Q3. System Design Question
He gave me a scenario and asked me to design a system for it , it was about 40 mins discussion.
He said , ” There are some islands initially they are not connected with each other. Now...read more
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