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A set is implemented as a data structure that stores unique elements with no specific order.
A set does not allow duplicate elements.
Sets are commonly implemented using hash tables or binary search trees.
Examples of set implementations include HashSet in Java and std::set in C++.
Unordered set is typically implemented using hash tables.
Uses hash tables to store elements with unique keys
Provides constant time complexity for insertion, deletion, and lookup operations
Does not maintain any specific order of elements
I was interviewed in Apr 2021.
Round duration - 90 minutes
Round difficulty - Medium
Timing was late evening. Platform was good.
Given a maze represented by 'N' cells numbered from 0 to N-1, and an array arr
of 'N' integers where arr[i]
denotes the cell number that can be reached from the 'i'...
Identify the length of the largest cycle in a maze represented by cells and an array of integers.
Iterate through each cell and find cycles using DFS or Floyd's Tortoise and Hare algorithm.
Keep track of visited cells and cycle lengths to identify the largest cycle.
If a cell has no exit (-1), mark it as visited to avoid infinite loops.
You need to determine all possible paths for a rat starting at position (0, 0) in a square maze to reach its destination at (N-1, N-1). The maze is represented as an N*N ma...
Find all possible paths for a rat in a maze from source to destination.
Use backtracking to explore all possible paths in the maze.
Keep track of visited cells to avoid revisiting them.
Recursively try moving in all directions (up, down, left, right) until reaching the destination.
Add the path to the result list when the destination is reached.
Sort the result list in alphabetical order before returning.
Tip 1 : Do some projects.
Tip 2 : Practice dynamic programming.
Tip 1 : Keep it short.
Tip 2 : Do not put false things on resume.
Find the odd repeating element from an array of strings
Use a hash table to count the frequency of each element
Iterate through the hash table to find the element with an odd count
Finding an element in a sorted 2D matrix
Start from the top right corner or bottom left corner
Compare the target element with the current element
Move left or down if the target is smaller, else move right or up
Repeat until the target is found or all elements are checked
SQL query to find Nth highest salary from table
Use ORDER BY and LIMIT clauses
Use subquery to get the Nth highest salary
Handle cases where there are less than N distinct salaries
Function to swap '3' and '4' without using if-else
Use XOR operator to swap the values
Convert the input to ASCII code and perform the swap
Use a lookup table to map the values
I am a software developer with experience in Java and Python.
Proficient in Java and Python programming languages
Experience in developing web applications using Spring framework
Familiarity with database management systems like MySQL and MongoDB
PAYTM is a leading digital payment platform in India with a wide range of services.
PAYTM has a user-friendly interface and offers a seamless payment experience.
It provides a variety of services like mobile recharges, bill payments, and online shopping.
PAYTM has a strong focus on security and fraud prevention measures.
It has a large user base and is widely accepted by merchants across India.
PAYTM is constantly innovatin...
Yes, I am open to pursuing further studies in the future.
I believe in continuous learning and staying updated with the latest technologies.
Further studies can help me specialize in a particular field and enhance my skills.
I may consider pursuing a master's degree in computer science or a related field.
However, my immediate focus is on gaining practical experience and contributing to the organization.
PAYTM grew fast due to its innovative approach and early adoption of digital payments.
Early adoption of digital payments in India
Innovative approach with features like mobile recharges, bill payments, and cashback offers
Expansion into e-commerce and financial services
Strategic partnerships with major companies like Uber and Alibaba
I was interviewed before Sep 2020.
Round duration - 45 minutes
Round difficulty - Medium
I applied thorough LinkedIn and got a call from HR for the interview.
I went to their Noida Office.
First round was mainly focused on Javascript fundamentals.
Interviewer was also friendly.
Round duration - 1 hour
Round difficulty - Medium
Second round was after 15 minutes of the first round. The focus of this round was DS & Algorithms.
Given an array ARR
of N
integers and an integer S
, determine if there exists a subarray (of positive length) within the given array such that the sum of its elements equals S
....
Given an array and a target sum, find a subarray that sums up to the target sum.
Iterate through the array while keeping track of the running sum and the starting index of the subarray.
Use a hashmap to store the running sum and its corresponding index.
If the running sum - target sum is found in the hashmap, it means a subarray with the target sum exists.
Return the starting and ending indices of the subarray or [-1, -1]
You are provided with two arrays, AT
and DT
, representing the arrival and departure times of all trains arriving at a railway station.
Your task is to determine the m...
This question asks to find the minimum number of platforms required at a railway station so that no train needs to wait.
Sort the arrival and departure times arrays in ascending order.
Initialize a variable 'platforms' to 1 and 'maxPlatforms' to 1.
Iterate through the arrival and departure times arrays simultaneously.
If the current arrival time is less than or equal to the current departure time, increment 'platforms'.
If ...
Round duration - 30 minutes
Round difficulty - Easy
The interviewer asked about JavaScript questions and the work culture of the team during the managerial round.
JavaScript questions related to closures, prototypes, event handling, and asynchronous programming may have been asked.
Work culture may involve collaboration, innovation, agile methodologies, and continuous learning.
Examples of work culture could include regular team meetings, code reviews, hackathons, and ment
Round duration - 15 minutes
Round difficulty - Easy
Tip 1 : Be strong at your basics.
Tip 2 : Don't hesitate to ask questions to interviewer.
Tip 3 : Prepare good for DS & Algo as most companies have a separate round for it.
Tip 1: If possible make 1 page resume
Tip 2: Don't put too many things. Keep it simple. If you're a fresher and have good projects, do put them before your academic section.
Tip 3: Be ready to explain everything you have in your resume.
I was interviewed before Jun 2016.
I have the ability to handle pressure effectively.
I remain calm and focused in high-pressure situations.
I prioritize tasks and manage my time efficiently.
I seek support and guidance from team members when needed.
I maintain a positive attitude and adapt to changing circumstances.
I have successfully completed projects under tight deadlines.
I was interviewed in Dec 2017.
To find the maximum water pond formed between buildings.
Identify the lowest point between the buildings.
Calculate the area of the pond using the distance between the buildings and the depth of the pond.
Consider any obstacles or uneven ground that may affect the pond's shape.
Use a surveying tool or satellite imagery to get accurate measurements.
Take into account any drainage systems or natural water flow that may affect
Design a dictionary using trie with insert, update and delete operations.
Implement a Trie data structure with nodes containing a character and a boolean flag to indicate end of word
For insert operation, traverse the trie and add nodes for each character in the word
For update operation, delete the existing word and insert the updated word
For delete operation, mark the end of word flag as false and delete the node if it ...
I applied via Campus Placement and was interviewed before Nov 2023. There was 1 interview round.
1hr aptitude + coding
I applied via Approached by Company and was interviewed before Sep 2023. There was 1 interview round.
based on 1 interview
Interview experience
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