Info Edge Front end Developer Interview Questions and Answers

Q1. Asked about fundamentals of javascript and react
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Q2. React lifecycle in functional components
Ans. 
React lifecycle in functional components
• useEffect hook replaces lifecycle methods

• useEffect runs after every render by default

• useEffect can be controlled by dependencies array

• useEffect cleanup function can be used to clean up effects

• useLayoutEffect hook runs synchronously after DOM mutations
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Return numbers in array equal to sum

Round duration - 45 Minutes
Round difficulty - Easy

Q1. 
Triplets with Given Sum Problem
Given an array or list ARR consisting of N integers, your task is to identify all distinct triplets within the array that sum up to a specified number K.
Explanation:
A t...read more
Ans. 
The task is to identify all distinct triplets within an array that sum up to a specified number.
• Iterate through the array and use nested loops to find all possible triplets.

• Check if the sum of the triplet equals the specified number.

• Print the valid triplets or return -1 if no such triplet exists.
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Q2. 
Find Magic Index in Sorted Array
Given a sorted array A consisting of N integers, your task is to find the magic index in the given array, where the magic index is defined as an index i such that A[i] = i...read more
Ans. 
Find the magic index in a sorted array where A[i] = i.
• Iterate through the array and check if A[i] = i for each index i.

• Since the array is sorted, you can optimize the search using binary search.

• Return the index if found, else return -1.
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Round duration - 50 Minutes
Round difficulty - Hard

Q1. 
Alien Dictionary Problem Statement
You are provided with a sorted dictionary (by lexical order) in an alien language. Your task is to determine the character order of the alien language from this dictiona...read more
Ans. 
Given a sorted alien dictionary in an array of strings, determine the character order of the alien language.
• Iterate through the words in the dictionary to build a graph of character dependencies.

• Perform a topological sort on the graph to determine the character order.

• Return the character array representing the order of characters in the alien language.
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Q2. 
Jumping Numbers Problem Statement
Given a positive integer N, your goal is to find all the Jumping Numbers that are smaller than or equal to N.
A Jumping Number is one where every adjacent digit has an a...read more
Ans. 
Find all Jumping Numbers smaller than or equal to a given positive integer N.
• Iterate through numbers from 0 to N and check if each number is a Jumping Number.

• For each number, check if the absolute difference between adjacent digits is 1.

• Include all single-digit numbers as Jumping Numbers.

• Output the list of Jumping Numbers that are smaller than or equal to N.
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Q3. 
Matching Prefix Problem Statement
Given an integer N representing the number of strings in an array Arr composed of lowercase English alphabets, determine a string S of length N such that it can be used t...read more
Ans. 
Given an array of strings, find the lexicographically smallest string that can be used as a prefix to minimize the total cost of deleting prefixes from the strings.
• Iterate through the array to find the common prefix among all strings

• Choose the lexicographically smallest common prefix

• Delete the common prefix from each string in the array to minimize the total cost
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Round duration - 20 Minutes
Round difficulty - Easy