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OLA Interview Experience | For Experienced -SDE-2

  • Last Updated : 26 Aug, 2019

It was a weekend drive. They asked me to bring my own laptop.

Round 1: Coding Round (90 mins) via Hacker Rank

Q1) Given a binary String which represents the target state. Minimum number of flips needed to convert a same size Binary String (with all 0’s)  to target state. A flip also causes all the right bits to be flipped.


Input : 00101 (Represents Target)

Output : 3

Explanation :

00000 -> 00111 -> 00100 -> 00101


Q2 ) You have been given a special and normal status of alphabets.

e.g. “01111001111111111011111111” represents “abcdefghijklmnopqrstuvwxyz”. Here 0 represents normal character and 1 represents special character.

Given an Input String S and a number k, find the maximum continuous sub array with maximum k number of number elements. There is no constraint on special character. 


S = “giraffe”, K = 1,  “011110011111111110111111”

Output : 3

How ?

normal characters : a, g, f

one of the possible solution : gir (as this has only one normal character)


Q3) There are cards and each card has an identity. e.g. HC1 has ID 1, this ID also represents the cost of the card. Your sister already have some cards and you want to gift her cards which she do not have already. Program is to return the max number of cards you can buy for her.

Constraint :  You have amount d, and want to buy as many distinct card as you can.

e.g. Sister Cards = [2, 3, 5],  D : 7 Card you buy : 1, 4

Output : 2


I was able to solve all above with all test cases passed.

Round 2: (1 hour)

It was a face to face round.

Q1) Given a sorted dictionary of an alien language having N words and k starting alphabets of standard dictionary the task is to complete the function which returns a string denoting the order of characters in the language. (here)

I was not able to think in manner of a graph and my solution was not optimal.


Q2) Given a matrix mat[][] of size M*N. Traverse and print the matrix in spiral form. (here)

Due to first question approach they were not sure and told me if needed they will reach out to me next week.


Attention reader! Don’t stop learning now. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready. To complete your preparation from learning a language to DS Algo and many more, please refer Complete Interview Preparation Course. In case you are prepared, test your skills using TCS, Wipro, Amazon. GoogleE-Litmus and Microsoft Test Serieses.

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