Paytm First Games Interview Questions and Answers

Round duration - 90 Minutes
Round difficulty - Medium

The first round was scheduled in the evening time.
First of all interviewer introduced himself and after my introduction 
He directly shoot first DSA question. The question was easy but conceptual. I have solved some question with same concept and he ask me to share the screen and code in online compiler. Finally I was able to get correct output with all the use cases and I was like "Half work done!"
Then he asked me very core concepts of JavaScript along with that Some Output based questions.
Then finally he asked me theory questions on React along with my experience in React. 
The interviewer was very helpful as well as polite. I don't think if he will not help me during interview I could crack the interview

Q1. 
Is the Sentence a Pangram?
Ninja is relocating to a place called NinjaGram, and for school admission, he is required to identify if a given sentence is a pangram. Your task is to assist Ninja in determini...read more
Ans. 
Yes, the sentence is a pangram if it includes every letter of the English alphabet at least once.
• Check if the sentence contains all 26 letters of the English alphabet.

• Convert the sentence to lowercase to simplify the checking process.

• Use a set to keep track of the letters present in the sentence.

• Iterate through the sentence and add each unique letter to the set.

• After iterating, check if the set contains all 26 letters.
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Three coding online assessments - screening round.

Two to three coding questions based on dynamic programming.

Q1. Resume based and computer network
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Q1. Simple hr question
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DSA, problem solving

System design interview and prior experience in projects

Q1. What was the toughest problem you encountered in your previous assignments ?
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Q2. Given a choice, what would you have done differently in your previous assignments ?
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Q1. Details about the projects in your resume
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Q2. MYSQL codes in window function
Ans. 
MYSQL window functions allow for calculations across rows in a result set.
• Window functions are used to perform calculations across rows in a result set

• They are used with the OVER() clause

• Examples include ROW_NUMBER(), RANK(), DENSE_RANK(), and NTILE()

• They can be used to calculate running totals, moving averages, and more
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Q3. Mostly questions related to cricket tables which was told to be assumed
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Q1. Tell me about yourself
Ans. 
Experienced Senior Software Engineer with a passion for problem-solving and creating innovative solutions.
• Over 8 years of experience in software development

• Proficient in multiple programming languages such as Java, Python, and C++

• Strong background in designing and implementing scalable systems

• Led successful projects such as developing a real-time data analytics platform for a Fortune 500 company
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Q2. About techstacks
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Q1. Nth Greatest Element III (Leetcode)
Ans. 
Find the Nth greatest element in an array without sorting
• Use a priority queue to keep track of the N greatest elements

• Iterate through the array and add elements to the priority queue

• Return the top element from the priority queue as the Nth greatest element
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Q2. Heater Problem (Leetcode)
Ans. 
Heater Problem - Find minimum radius to cover all houses with heaters
• Sort the houses and heaters arrays

• For each house, find the closest heater using binary search

• Calculate the minimum radius needed to cover all houses
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Easy coding questions

Tough level questions , needed high level of thinking