Ola Cabs Interview Questions, Process, and Tips

Online test depends upon aptitude, verbal communication

General knowledge topics

Q1. Telephonic round
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Q1. Self introduction, general topics
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Q1. Rotation of a string k times with a complexity of k
Ans. 
Rotation of a string k times with a complexity of k
• Use string slicing to split the string into two parts and swap them k times

• Complexity will be O(k) as we are swapping only k times

• Example: 'hello' rotated 2 times becomes 'llohe'
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Q1. Explain JVM architecture and Tuning options
Ans. 
JVM is the virtual machine that executes Java bytecode. It has various components and tuning options to optimize performance.
• JVM consists of class loader, memory management, bytecode verifier, and execution engine

• Tuning options include heap size, garbage collection algorithm, and thread stack size

• JVM performance can be improved by optimizing code, reducing object creation, and using appropriate data structures
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Q1. Introduction , and normal discuss , perviuos job exprence
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Q2. Knowladge of marketing works for other company and all
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Q1. What are your family background
Ans. 
In my family there is mother and father and one big brother and three big sisters. and my wife and my daughter
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Q2. Last per work location and position
Ans. 
my last job shift manager in ola grocery store
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Q3. And store general knowledge questions
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Round duration - 60 minutes
Round difficulty - Medium

It was a problem solving round where a hackerrank link was given containing 2 questions.
You have to solve them within 90 minutes.
I was asked to solve it within a week.

Q1. 
Find Distinct Palindromic Substrings
Given a string 'S', identify and print all distinct palindromic substrings within it. A palindrome reads the same forwards and backwards. For example, 'bccb' is a pali...read more
Ans. 
Given a string, find and print all distinct palindromic substrings within it.
• Iterate through all possible substrings of the input string

• Check if each substring is a palindrome

• Store distinct palindromic substrings in a set and then sort them before printing
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Round duration - 60 minutes
Round difficulty - Easy

2 questions was asked by the interviewer. You have to clearly explain your approach and write a working solution. He even asked me to run on some additional test cases

Q1. 
Job Sequencing Problem Statement
You are provided with a N x 2 2-D array called Jobs consisting of N jobs. In this array, Jobs[i][0] represents the deadline of the i-th job, while Jobs[i][1] indicates the...read more
Ans. 
Maximize profit by scheduling jobs within their deadlines.
• Sort the jobs based on their profits in descending order.

• Iterate through the sorted jobs and schedule them based on their deadlines.

• Keep track of the maximum profit achievable by scheduling jobs within their deadlines.
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Q2. 
Partition Equal Subset Sum Problem
Given an array ARR consisting of 'N' positive integers, determine if it is possible to partition the array into two subsets such that the sum of the elements in both sub...read more
Ans. 
The problem is to determine if it is possible to partition an array into two subsets with equal sum.
• Use dynamic programming to solve this problem efficiently.

• Create a 2D array to store the subset sum possibilities.

• Check if the total sum of the array is even before attempting to partition.

• Iterate through the array and update the subset sum array accordingly.

• Return true if the subset sum array contains a sum equal to hal
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Round duration - 60 minutes
Round difficulty - Easy

I was asked 1 system design question. The question was to design an online multiplayer game which can be scaled for more than 10 million users. 
The interviewer helped me to collect requirement and also helped me in choosing different low latency protocol to communicate between client and server.

Round duration - 60 minutes
Round difficulty - Medium

The interviewer asked few sql based questions and asked me to write the solution.
He also gave 1 problem solving question.

Q1. Can you explain the different types of joins in SQL and how to calculate the average of all values from a given table?
Ans. 
Different types of joins in SQL and calculating average of values from a table.
• Types of joins: INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL JOIN

• To calculate average: Use AVG() function in SQL

• Example: SELECT AVG(column_name) FROM table_name
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