People Group Front end Developer Interview Questions and Answers

1 Hr coding round, Leetcode medium problems like Minimum Grid sum & Basic calculator

Online aptitude test with general aptitude questions.

Q1. Basic js, ES6 features, Angular Questions, Node.js Lifecycle, event loop, mongodb questions, some HR questions
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Round duration - 30 minutes
Round difficulty - Easy

This was just a screening round to check my intention and communication skills. They just asked me why was I looking for a job change, and told me a little bit about the profile.

Round duration - 45 Minutes
Round difficulty - Easy

Since I had applied for a full stack profile, this round mainly consisted of front-end questions and some basic DSA questions. They had scheduled a call in the afternoon around 14:00 and the call was on Google meet where I had to share my screen and type in some code, once I was happy with my code and it worked fine, I had to paste it into the google doc. Actually, they had outsourced the interview rounds to the Interview Vector.

Q1. 
Flatten 2D Array Problem
Implement an iterator called ‘FLATTEN_2D’ to transform a two-dimensional array ‘ARR_2D’ into a one-dimensional array ‘ARR_1D’. The iterator should support the following operations...read more
Ans. 
Implement an iterator to flatten a 2D array into a 1D array in row-wise traversal.
• Create a class 'FLATTEN_2D' with 'NEXT' and 'HAS_NEXT' methods.

• Maintain current row and column indices to keep track of traversal.

• Handle edge cases like empty rows and columns.

• Combine elements row-wise to form the 1D array.

• Return the elements of 'ARR_1D' for each test case.
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Q2. Implement a function 'sum' such that the following conditions hold: sum(1)(2)(3)(4)() returns 10, sum(1)() returns 1, and sum() returns 0.
Ans. 
Implement a function 'sum' with varying number of arguments to return the sum of all arguments.
• Create a function 'sum' that takes in a number as argument and returns a new function that takes in the next number.

• Each subsequent call to the returned function should add the argument to the running total.

• Return the running total when an empty argument is passed.
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Round duration - 90 Minutes
Round difficulty - Easy

This round consisted of multiple easy DSA questions, some frontend questions, and one thought experiment related to design. Again, this round was conducted around 14:00 in the afternoon.

Q1. 
Anagram Pairs Verification Problem
Your task is to determine if two given strings are anagrams of each other. Two strings are considered anagrams if you can rearrange the letters of one string to form the...read more
Ans. 
Check if two strings are anagrams of each other by comparing their sorted characters.
• Sort the characters of both strings and compare them.

• If the sorted strings are equal, then the strings are anagrams.

• Use a dictionary to count the occurrences of characters in each string for a more optimized solution.
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Simple Question Based On Time And Work, Trains Etc Easy To Crack.

Q1. Technical Round Basically Based On Your Resume And Your Experience.
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Round duration - 150 Minutes
Round difficulty - Medium

3 coding questions and 20 mcq's

Q1. 
Maximum Sum of Two Non-Overlapping Subarrays
Given an integer array ARR and a positive integer K, your task is to determine two non-overlapping subarrays of length K that yield the maximum combined sum.
...read more
Ans. 
The task is to find two non-overlapping subarrays of length K in an array, such that their sum is maximum.
• Iterate through the array and calculate the sum of each subarray of length K

• Store the maximum sum obtained from the first subarray

• Iterate again and calculate the sum of each subarray of length K, excluding the previous subarray

• Store the maximum sum obtained from the second subarray

• Return the sum of the two maximum
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Q2. 
Distinct Subsequences Problem Statement
You are given a string 'S' of length 'N' which may include duplicate alphabets. Your goal is to calculate the number of distinct subsequences in the string.
Exampl...read more
Ans. 
The task is to find the count of distinct subsequences in a given string.
• Use dynamic programming to solve the problem.

• Create a 2D array to store the count of distinct subsequences for each prefix of the string.

• Initialize the first row of the array with 1, as there is only one subsequence of an empty string.

• For each character in the string, calculate the count of distinct subsequences by considering two cases: including...read more
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Q3. 
Array Intersection Problem Statement
Given two integer arrays/ lists ARR1 and ARR2 of sizes N and M respectively, you are required to determine their intersection. An intersection is defined as the set of...read more
Ans. 
The task is to find the intersection of two integer arrays/lists.
• Read the number of test cases

• For each test case, read the size and elements of the first array/list

• Read the size and elements of the second array/list

• Find the intersection of the two arrays/lists

• Print the intersection elements in the order they appear in the first array/list
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Round duration - 120 Minutes
Round difficulty - Medium

Online video call based round, Timing was 10-11 AM
Interview started with basic greetings, post that i explained by projects in brief and then we jumped right into dsa questoins.

Q1. 
Number of Islands Problem Statement
You are given a non-empty grid that consists of only 0s and 1s. Your task is to determine the number of islands in this grid.
An island is defined as a group of 1s (re...read more
Ans. 
The task is to find the number of islands in a grid consisting of 0s and 1s.
• An island is a group of 1s connected horizontally, vertically, or diagonally

• The grid is surrounded by 0s on all four edges

• Use a depth-first search (DFS) or breadth-first search (BFS) algorithm to traverse the grid and count the number of islands

• Initialize a visited array to keep track of visited cells

• For each unvisited cell with a value of 1, p...read more
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Q2. 
Arrangement Problem Statement
Determine the number of permutations of list A = [1, 2, ..., N] such that for every index i, either A[i] is divisible by i or i is divisible by A[i].
Input:
The input start...read more
Ans. 
The goal is to find the number of permutations of a list satisfying certain conditions.
• Iterate through all permutations of the list

• Check if each permutation satisfies the given conditions

• Count the number of permutations that satisfy the conditions

• Return the count for each test case
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Q3. 
Idempotent Matrix Verification
Determine if a given N * N matrix is an idempotent matrix. A matrix is considered idempotent if it satisfies the following condition:
M * M = M
Input:
The first line cont...read more
Ans. 
An idempotent matrix is a square matrix that remains unchanged when multiplied by itself.
• Check if the given matrix satisfies the property M*M = M

• Iterate through each element of the matrix and perform the matrix multiplication

• Compare the result with the original matrix

• If they are equal, return true; otherwise, return false
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Round duration - 120 Minutes
Round difficulty - Easy

This was EM round, started with me explaining my projects in deep and facing some counter questions on that, proceeded to os, dbms basic questions and some low level designing and lastly a puzzle to end interview.

Q1. Can you design an attendance management system?
Ans. 
Design attendance management system
• Create a database to store employee information

• Implement a user interface for employees to mark their attendance

• Develop a system to track and record attendance data

• Generate reports and analytics based on attendance data
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Round duration - 20 Minutes
Round difficulty - Easy

This was formality round, HR came and explained what meesho does and told my joining dates and compensation details.

3 Moderate questions were asked. I managed to solve 2 completely and 1 partially.

Q1. Question related to system design were asked.
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Q2. He asked me to design some functions of facebook.
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Q1. Introduction type questions were asked. In this it will prefer only CS students
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