Info Edge Front end Developer Interview Questions, Process, and Tips

Coding a frontend UI from provided image. And creating a fucntional star rating system

Q1. Designing a Component API in React using Typescript.
Ans. 
Designing a Component API in React using Typescript involves defining props, state, and methods for the component.
• Define the props interface to specify the expected input data for the component

• Use typescript types to ensure type safety and prevent runtime errors

• Define the state interface to manage the internal state of the component

• Implement methods to handle user interactions and component logic

• Document the component
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Q2. Create a function that can clear all the timer ids at once.
Ans. 
Function to clear all timer ids at once
• Create an array to store all timer ids

• Iterate through the array and clear each timer id using clearTimeout() function
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Q1. Given a matrix zeros and ones find minimum distance for each one to a zero.
Ans. 
Given a matrix of zeros and ones, find the minimum distance for each one to a zero.
• Use breadth-first search (BFS) to find the minimum distance from each one to a zero.

• Start by initializing a queue with all the zeros in the matrix.

• While the queue is not empty, dequeue a zero and enqueue its neighboring ones.

• Keep track of the distance from each one to the nearest zero.

• Repeat until all ones have been visited.

• Return the ma
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30mins aptitude test

90 mins coding test for 3 questions

Q1. Why are you choosing this role
Ans. 
I am choosing this role because of my passion for creating user-friendly and visually appealing websites.
• Passion for front end development

• Enjoy creating user-friendly interfaces

• Excited about the creative aspect of web design
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Q2. Why should we write you
Ans. 
I am a dedicated and skilled front end developer with a passion for creating user-friendly interfaces.
• I have a strong understanding of HTML, CSS, and JavaScript

• I have experience with responsive design and cross-browser compatibility

• I am proficient in using front end frameworks like React and Angular
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Round duration - 180 minutes
Round difficulty - Medium

The online test consisted of 2 coding questions, 30 aptitude MCQs, 30 behavioral MCQs and 10 code snippets to debug. The coding questions were of medium level, aptitude MCQs were easy and the code snippets to debug was also of easy level. Each section had a time constraint.

Q1. 
Merge Two Sorted Linked Lists Problem Statement
You are provided with two sorted linked lists. Your task is to merge them into a single sorted linked list and return the head of the combined linked list.
...read more
Ans. 
Merge two sorted linked lists into a single sorted linked list without using additional space beyond constant space complexity.
• Create a dummy node to start the merged list

• Iterate through both linked lists and compare nodes to merge them in sorted order

• Update the next pointers accordingly

• Handle cases where one list is empty or both lists are empty

• Return the head of the merged linked list
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Q2. 
Minimum Path Sum Problem Statement
Consider a 2-dimensional grid 'GRID' with 'N' rows and 'M' columns in Ninjaland. Each cell in the grid has an associated cost. The goal is to determine the minimum path ...read more
Ans. 
The Minimum Path Sum Problem involves finding the minimum sum of costs along a path from the top-left to the bottom-right of a grid.
• Use dynamic programming to calculate the minimum path sum by considering the costs of moving down or right at each cell.

• Initialize a 2D array to store the minimum path sum values for each cell in the grid.

• Iterate through the grid to calculate the minimum path sum for each cell based on the...read more
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Round duration - 60 minutes
Round difficulty - Medium

My interview was at 9:00 am. The interview was conducted on Amazon Chime and my webcam was on. The interviewer also asked me to write the code on a document which can be edited by both me and the interviewer. The difficulty of the questions was of medium level. I was asked 3 coding questions along with 2 questions related to OOPS at the end. The interview ended with the discussion of one of my projects. The interviewer was good and also gave me hints wherever required.

Q1. 
Palindrome Partitioning Problem Statement
You are given a string S. Your task is to partition S such that every substring of the partition is a palindrome. Your objective is to return all possible palindr...read more
Ans. 
Given a string, partition it into palindromes and return all possible configurations.
• Use backtracking to generate all possible palindrome partitions

• Check if each substring is a palindrome before adding it to the partition

• Return all valid partitions as an array of strings
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Q2. 
Longest Increasing Subsequence Problem Statement
Given an array of integers with 'N' elements, determine the length of the longest subsequence where each element is greater than the previous element. This...read more
Ans. 
Find the length of the longest strictly increasing subsequence in an array of integers.
• Use dynamic programming to solve this problem efficiently.

• Initialize an array to store the length of the longest increasing subsequence ending at each index.

• Iterate through the array and update the length of the longest increasing subsequence for each element.

• Return the maximum value in the array as the result.
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Q3. 
Find Missing Number In String Problem Statement
You have a sequence of consecutive nonnegative integers. By appending all integers end-to-end, you formed a string S without any separators. During this pro...read more
Ans. 
Find the missing number in a string of consecutive nonnegative integers.
• Iterate through the string and check for missing numbers by comparing adjacent integers

• If a missing number is found, return it as the output

• Handle cases where there are multiple missing numbers or the string is invalid by returning -1
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Q4. What are the ACID properties in DBMS?
Ans. 
ACID properties in DBMS ensure data integrity and consistency.
• Atomicity: All operations in a transaction are treated as a single unit of work, either all succeed or all fail.

• Consistency: Database remains in a consistent state before and after the transaction.

• Isolation: Transactions are isolated from each other until they are completed.

• Durability: Once a transaction is committed, the changes made by it are permanent and...read more
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Round duration - 90 minutes
Round difficulty - Easy

This was MCQ+Coding round.

Q1. How can you check if two strings are anagrams of each other?
Ans. 
Check if two strings are anagrams by comparing the sorted versions of the strings.
• Sort both strings and compare if they are equal.

• Use a hashmap to store the frequency of characters in each string and compare the maps.

• Ignore spaces and punctuation when comparing the strings.
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Round duration - 90 minutes
Round difficulty - Easy

This was face to face interview round.

Round duration - 90 minutes
Round difficulty - Easy

This was face to face interview round.

Round duration - 90 Minutes
Round difficulty - Medium

Interview started at 11:00 am. It was an online round. During the coding round I submitted optimized solution and got full acceptance of the solutions.

Q1. 
Detect Cycle in a Directed Graph
You are provided with a directed graph composed of 'N' nodes. You have a matrix called 'EDGES' with dimensions M x 2, which specifies the 'M' edges in the graph. Each edge...read more
Ans. 
Detect cycle in a directed graph using depth-first search (DFS) algorithm.
• Use DFS to traverse the graph and detect back edges indicating a cycle.

• Maintain a visited array to keep track of visited nodes during traversal.

• If a node is visited again during traversal and it is not the parent node, then a cycle exists.

• Return true if a cycle is detected, false otherwise.
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Round duration - 80 Minutes
Round difficulty - Medium

Interview started at 10:00 am. Interview went well, I was able to connect with the interviewer and enjoyed the whole interview

Q1. 
Next Smallest Palindrome Problem Statement
Find the next smallest palindrome strictly greater than a given number 'N' represented as a string 'S'.
Explanation:
You are given a number in string format, a...read more
Ans. 
Find the next smallest palindrome greater than a given number represented as a string.
• Convert the string to an integer, find the next greater palindrome, and convert it back to a string.

• Handle cases where the number is a palindrome or has all digits as '9'.

• Consider both odd and even length numbers when finding the next palindrome.
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Round duration - 80 Minutes
Round difficulty - Medium

Interview started at 11:00 am. Interview went well.

Q1. 
Boundary Traversal of a Binary Tree
Given a binary tree of integers, your task is to return the boundary nodes of the tree in Anti-Clockwise direction starting from the root node.
Input:
The first line ...read more
Ans. 
Return the boundary nodes of a binary tree in Anti-Clockwise direction starting from the root node.
• Traverse the left boundary nodes in a top-down manner

• Traverse the leaf nodes from left to right

• Traverse the right boundary nodes in a bottom-up manner

• Handle cases where duplicates occur in the boundary nodes

• Implement the function without printing as printing is already managed
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