PayU Payments Software Developer Intern Interview Questions and Answers

Creating a Web App using React JS and Java Servlets

5 MCQ questions, and 1 coding question similar to Leetcode medium-hard level (topic-greedy).

Q1. Basic DSA questions related to strings, linkedlists, binary search etc.
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Q2. Questions related to resume
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1 hr , 3 sum leetcode question

DSA Problems on LinkedList and Stack.

Q1. HM Round on projects and all
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Q1. There were basic DSA questions
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Q2. Few questions based on Resume and Projects
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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

Q1. 
Reverse the String Problem Statement
You are given a string STR which contains alphabets, numbers, and special characters. Your task is to reverse the string.
Example:
Input:
STR = "abcde"
Output:
"e...read more
Ans. 
This can be done by iterative swapping using two pointers. The first pointer points to the beginning of the string, whereas the second pointer points to the end. Both pointers keep swapping their elements and go towards each other. Essentially, the algorithm simulates the rotation of a string with respect to its midpoint.
Time Complexity : O(n)
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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

Q1. 
One Away Transformation Problem
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...read more
Ans. 
The idea is to create a new character array and copy the characters from the original String before the given position
After that, we put the new character at the position and copy the rest of the characters from the original String in the subsequent positions of the new array.
Other option can be to directly use the already defined methods such as insert().
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Q2. 
Remove Duplicates from String Problem Statement
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...read more
Ans. 
Hashing can be used to approach this problem.
Use a hash map and maintain count of the occurrences of all the characters in the string which character as the string and count as the value. At last, traverse the hash map and print all those characters with count > 1. 
Time Complexity : O(N) where N is the length of the string
Space Complexity : O(N)
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Round duration - 30 minutes
Round difficulty - Easy

It was easy. I could answer the first question. Second one I answered really badly

Q1. Java questions were asked by them
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Q2. Python were asked by them
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Q1. Location preferences were asked by them
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Q2. Future what u wanna do was asked by them
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