Filter interviews by
Clear (1)
I applied via Campus Placement and was interviewed in Nov 2023. There were 2 interview rounds.
5 MCQ questions, and 1 coding question similar to Leetcode medium-hard level (topic-greedy).
I was interviewed before Jan 2021.
Round duration - 75 minutes
Round difficulty - Easy
Simple question based on strings was given. MCQs based on basic aptitude and programming questions were asked.
Tips: Time management is important. Remember all the syntaxes
You are given a string STR
which contains alphabets, numbers, and special characters. Your task is to reverse the string.
STR = "abcde"
"e...
Reverse a given string containing alphabets, numbers, and special characters.
Iterate through the string from the end to the beginning and append each character to a new string.
Use built-in functions like reverse() or slicing to reverse the string.
Handle special characters and numbers while reversing the string.
Ensure to consider the constraints on the input string length and number of test cases.
Round duration - 60 minutes
Round difficulty - Easy
It was a good experience.
Tips: If you don't know something just tell them. Don't try to answer something if you don't know anything about it
Given two strings, A
and B
, determine whether A
can be transformed into B
by performing at most one of the following operations (including zero operations):
1. Delete a ch...
Determine if one string can be transformed into another by performing at most one operation (insert, delete, replace).
Iterate through both strings simultaneously and check for differences.
Handle cases where a character needs to be inserted, deleted, or replaced.
Keep track of the number of operations performed and ensure it does not exceed one.
You are provided a string STR
of length N
, consisting solely of lowercase English letters.
Your task is to remove all duplicate occurrences of characters i...
Remove duplicate occurrences of characters in a given string.
Use a hash set to keep track of characters seen so far.
Iterate through the string and add non-duplicate characters to a new string.
Return the new string without duplicate characters.
Round duration - 30 minutes
Round difficulty - Easy
It was easy. I could answer the first question. Second one I answered really badly
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Revise C++/Java.
Tip 3 : If you don't know much of C++/Java at least write the codes in C.
Tip 4 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
I was interviewed before Jan 2021.
Round duration - 60 minutes
Round difficulty - Easy
Technical round that lasted for around 60 minutes. The interviewer asked me questions based on DSA and OOPS concepts.
Given an undirected graph with ‘V’ vertices (labeled 0, 1, ... , V-1) and ‘E’ edges, where each edge has a weight representing the distance between two connected nodes (X,...
Dijkstra's algorithm is used to find the shortest path from a source node to all other nodes in a graph with weighted edges.
Implement Dijkstra's algorithm to find the shortest path distances from the source node to all other nodes.
Use a priority queue to efficiently select the next node with the shortest distance.
Update the distances of neighboring nodes based on the current node's distance and edge weights.
Handle disc...
C is a procedural programming language while C++ is an object-oriented programming language with features like classes and inheritance.
C is a procedural programming language, while C++ is a multi-paradigm language with support for object-oriented programming.
C does not support classes and objects, while C++ does.
C does not have features like inheritance and polymorphism, which are present in C++.
C is a subset of C++, m...
malloc is a function in C for dynamic memory allocation, while new is an operator in C++ for dynamic memory allocation and object creation.
malloc is a function in C, while new is an operator in C++.
malloc returns a void pointer, while new returns a pointer to the type being allocated.
malloc does not call constructors, while new calls constructors for object initialization.
malloc requires manual memory deallocation with...
A virtual function is a function in a base class that is declared using the keyword 'virtual' and can be overridden by a function with the same signature in a derived class.
Virtual functions allow for dynamic polymorphism in C++
They are used in inheritance to achieve runtime polymorphism
Example: virtual void display() = 0; in a base class and void display() override in a derived class
Round duration - 60 minutes
Round difficulty - Easy
Technical round that lasted for around 60 minutes. The interviewer asked me questions based on SQL and OOPS concepts.
Query to find the nth highest salary from a database
Use the ORDER BY clause to sort salaries in descending order
Use the LIMIT clause to select the nth highest salary
Consider handling cases where there may be ties for the nth highest salary
Stack is used for static memory allocation and stores local variables, while Heap is used for dynamic memory allocation and stores objects.
Stack is faster than Heap as it has a fixed size and memory allocation is done at compile time.
Heap is slower than Stack as memory allocation is done at runtime and requires more complex management.
Stack memory is limited and typically smaller in size, while Heap memory is larger an...
Round duration - 30 minutes
Round difficulty - Easy
HR round that lasted for around 30 minutes. The interviewer asked questions to know more about me. We also discussed a puzzle.
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
What people are saying about PayPal
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 ...
Implementing a shuffle function for a playlist of songs
Create a new empty playlist
Randomly select a song from the original playlist and add it to the new playlist
Remove the selected song from the original playlist
Repeat until all songs have been added to the new playlist
Return the new shuffled playlist
Memory leak is a situation where a program fails to release memory it no longer needs.
Memory leaks can cause a program to consume more and more memory over time, eventually leading to crashes or other issues.
Memory leaks can be caused by programming errors such as not freeing memory after it is no longer needed.
Tools like valgrind can be used to detect memory leaks in C and C++ programs.
Examples of memory leaks include...
Arrays have fixed size and can lead to memory wastage and performance issues.
Arrays have a fixed size and cannot be resized dynamically.
Inserting or deleting elements in an array can be time-consuming.
Arrays can lead to memory wastage if they are not fully utilized.
Arrays can cause performance issues if they are too large and need to be traversed frequently.
Arrays can also be prone to buffer overflow attacks.
Example: A...
Function to hide text on mouse click in JavaScript
Create a function that takes an element as input
Add an event listener to the element for a mouse click
Toggle the element's display property between 'none' and its original value
Find two elements in an unsorted array whose sum is equal to a given number x.
Use a hash table to store the difference between x and each element in the array.
Iterate through the array and check if the current element is in the hash table.
Return the pair of elements that add up to x.
BST stands for Binary Search Tree, a data structure used for efficient searching and sorting operations.
BST is a tree-like data structure where each node has at most two children.
The left child of a node contains a value less than the parent node, while the right child contains a value greater than the parent node.
BST allows for efficient searching and sorting operations with a time complexity of O(log n).
Examples of a...
Number of possible BSTs with 2 and 3 nodes.
For 2 nodes, only 2 BSTs are possible.
For 3 nodes, 5 BSTs are possible.
Number of BSTs can be calculated using Catalan numbers formula.
Catalan(2) = 2, Catalan(3) = 5.
Answering the question about possible trees with two and three nodes.
For two nodes, there is only one possible tree.
For three nodes, there are three possible trees.
The formula for calculating the number of possible trees with n nodes is (2n-3)!!.
The double exclamation mark represents the double factorial function.
The double factorial function is defined as n!! = n(n-2)(n-4)...(1 or 2).
B+ trees are balanced trees used for indexing and searching large amounts of data.
B+ trees are similar to binary search trees but have multiple keys per node.
They are commonly used in databases and file systems.
B+ trees have a high fanout, reducing the number of disk accesses required for searching.
They are also self-balancing, ensuring efficient performance even with large amounts of data.
Example: In a database, a B+ ...
Yes, I have a few questions.
Can you tell me more about the team I'll be working with?
What is the company culture like?
What are the biggest challenges the team is currently facing?
Can you walk me through the development process for a typical project?
What opportunities are there for professional growth and development?
I prefer hash tables for their constant time lookup and insertion.
Hash tables are efficient for storing and retrieving data.
They have constant time complexity for both insertion and lookup.
They can be implemented using arrays or linked lists.
Examples include Python's dictionary and Java's HashMap.
Yes, we can implement a stack using two queues.
Push operation: Enqueue the element to the first queue.
Pop operation: Dequeue all elements from the first queue and enqueue them to the second queue until the last element. Dequeue and return the last element. Swap the names of the queues.
Top operation: Same as pop operation but don't dequeue the last element.
Example: Push 1, 2, 3. Queue 1: 1 2 3. Queue 2: empty. Pop opera...
Find minimum no of platforms required to avoid collision between trains based on their arrival and departure times.
Sort both arrays in ascending order
Initialize platform count and max count to 1
Loop through both arrays and compare arrival and departure times
If arrival time is less than or equal to departure time, increment platform count
Else, decrement platform count
Update max count if platform count is greater than ma
JVM stands for Java Virtual Machine. It is an abstract machine that provides a runtime environment for Java programs.
JVM is responsible for interpreting the compiled Java code and executing it.
It provides platform independence by converting bytecode into machine-specific code.
JVM has various components like class loader, bytecode verifier, and execution engine.
Compiler converts source code into bytecode, while JVM exec...
I am a software engineer with experience in developing web applications and a passion for learning new technologies.
Experienced in developing web applications using technologies such as Java, Spring, and Angular
Passionate about learning new technologies and keeping up with industry trends
Strong problem-solving skills and ability to work in a team environment
Completed a Bachelor's degree in Computer Science from XYZ Uni
PayTM is an Indian e-commerce payment system and digital wallet company.
PayTM was founded in 2010 by Vijay Shekhar Sharma.
It started as a mobile recharge and bill payment platform.
PayTM has expanded to offer services like online shopping, movie ticket booking, and travel bookings.
It also offers a digital wallet that can be used to pay for various services and products.
PayTM has over 350 million registered users and is ...
I would like to add a feature for splitting bills among friends.
The feature would allow users to split bills for movies, dinners, etc.
Users can select friends from their contact list and split the bill equally or unequally.
The app would send a notification to the selected friends to pay their share.
The feature would make it easier for users to split expenses and avoid awkward conversations.
It would also encourage more
My favourite app is Spotify. I would like to see improvements in the algorithm for personalized playlists.
Improved algorithm for personalized playlists
Better integration with social media platforms
Option to create collaborative playlists with friends
My favourite subject is Computer Science.
I enjoy programming and problem-solving.
I find algorithms and data structures fascinating.
I am interested in artificial intelligence and machine learning.
I like learning about new technologies and keeping up with industry trends.
I choose NIT Hamirpur because of its excellent academic reputation and beautiful campus.
NIT Hamirpur has a strong focus on academics and research, which aligns with my career goals.
The campus is located in a serene and picturesque location, which provides a conducive environment for learning.
The faculty members are highly experienced and knowledgeable, and are always willing to help students.
The college has state-of-th...
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
Count the number of continuous sequences with equal number of 0's and 1's in an array.
Iterate through the array and keep track of the count of 0's and 1's encountered so far.
Store the difference between the counts in a hash table and increment the count for that difference.
If the difference is already present in the hash table, add the count to the existing value.
Return the sum of all values in the hash table.
Count the number of palindromic substrings in a given string.
A substring is a contiguous sequence of characters within a string.
A palindrome is a string that reads the same backward as forward.
Use dynamic programming to count all palindromic substrings.
Time complexity can be reduced to O(n^2) using Manacher's algorithm.
Find the longest palindrome in a given string in linear time complexity.
Use Manacher's algorithm to find the longest palindrome in a string in O(n) time complexity.
The algorithm involves preprocessing the string to add special characters to handle even and odd length palindromes.
Then, it uses a combination of dynamic programming and symmetry properties to find the longest palindrome.
For example, in the string 'babad',
The value of pie is a mathematical constant approximately equal to 3.14159.
Pie is the ratio of the circumference of a circle to its diameter.
It is an irrational number, meaning it cannot be expressed as a finite decimal or fraction.
Pie is commonly used in geometry and trigonometry calculations.
The value of pie is often approximated as 3.14 or 22/7.
I am a passionate software engineer with experience in developing web applications using various technologies.
Experienced in developing web applications using HTML, CSS, JavaScript, and frameworks like React and Angular
Proficient in backend development with Node.js and databases like MongoDB and MySQL
Familiar with version control systems like Git and deployment tools like Docker
Strong problem-solving skills and ability
Yes, I believe I will be able to fit in the company based on my experience, skills, and values.
I have experience working in diverse teams and adapting to different work cultures.
I share the company's values and vision, which align with my own.
I am eager to learn and contribute to the team, fostering a positive work environment.
I have strong communication skills, which are essential for collaboration and teamwork.
based on 1 interview
Interview experience
Software Engineer2
305
salaries
| ₹0 L/yr - ₹0 L/yr |
Software Engineer
259
salaries
| ₹0 L/yr - ₹0 L/yr |
Senior Software Engineer
236
salaries
| ₹0 L/yr - ₹0 L/yr |
Software Engineer III
228
salaries
| ₹0 L/yr - ₹0 L/yr |
Risk Analyst
166
salaries
| ₹0 L/yr - ₹0 L/yr |
Paytm
Razorpay
Visa
MasterCard