Ola Cabs Interview Questions, Process, and Tips

Q1. Tell me about yourself
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Q2. Tell me about your experience and choose any topic on your own
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Round duration - 90 minutes
Round difficulty - Medium

It was in the morning, where there were 3 questions to answer.

Q1. 
Number of Islands Problem Statement
You are provided with a 2-dimensional matrix having N rows and M columns, containing only 1s (land) and 0s (water). Your goal is to determine the number of islands in t...read more
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Q2. 
Missing Numbers Problem Statement
You are provided with an array called ARR, consisting of distinct positive integers. Your task is to identify all the numbers that fall within the range of the smallest a...read more
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Q3. 
Count Leaf Nodes in a Binary Tree
Given a binary tree, your task is to count and return the number of leaf nodes present in it.
A binary tree is a data structure where each node has at most two children,...read more
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Round duration - 20 minutes
Round difficulty - Medium

It was a system design round.

Q1. Can you describe the system design of the OLA app?
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Round duration - 45 minutes
Round difficulty - Medium

It was a DS Algo round.

Q1. 
Diagonal Traversal of a Binary Tree Problem Statement
Given a binary tree, your task is to determine the diagonal traversal of the tree.
Example:
Input:
1 2 3 4 -1 5 6 -1 7 -1 -1 -1 -1 -1 -1
Output:
...read more
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Q2. 
Minimum Number Of Taps To Water Garden Problem Statement
You are required to determine the minimum number of taps that need to be opened to water an entire one-dimensional garden defined along the x-axis,...read more
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Round duration - 15 minutes
Round difficulty - Medium

HR Round

Round duration - 45 minutes
Round difficulty - Easy

This round was telephonic round. The interview lasted for approximately 45 minutes. The interviewer asked me three coding questions. I hustled a bit on 3rd question but after a hint was able to solve it.

Round duration - 120 minutes
Round difficulty - Easy

This round was Online Test on Hackerrank for 120 minutes, it contained 3 questions.

Q1. 
LRU Cache Design Question
Design a data structure for a Least Recently Used (LRU) cache that supports the following operations:
1. get(key) - Return the value of the key if it exists in the cache; otherw...read more
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Round duration - 60 minutes
Round difficulty - Easy

This round was face to face Interview at Ola Campus and lasted for 1 hour.

Round duration - 35 minutes
Round difficulty - Easy

This round was again a face to face technical interview, I was just asked one question in this round.

Round duration - 30 minutes
Round difficulty - Easy

Only a question of System Design was asked

Q1. Design a toll booth system for Ola cabs and explain the necessary functions and data structures used in it.
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Round duration - 30 minutes
Round difficulty - Easy

Very general HR questions were asked