Airbnb Front end Developer Interview Questions and Answers for Freshers

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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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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There was an online coding test on signal consisting of leetcode easy medium and hard

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

Question are very tough and faad

Question like trees linked list and graphs

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 - 120 minutes
Round difficulty - Medium

10 min for debugging
40 min for problems(coding)
40 min for pyschometric
30 min for aptitude

Q1. 
Total Unique Paths Problem Statement
You are located at point ‘A’, the top-left corner of an M x N matrix, and your target is point ‘B’, the bottom-right corner of the same matrix. Your task is to calcula...read more
Ans. 
The task is to calculate the total number of unique paths from the top-left to bottom-right corner of an M x N matrix by moving only right or down.
• Use dynamic programming to solve this problem efficiently.

• Create a 2D array to store the number of unique paths for each cell in the matrix.

• Initialize the first row and first column with 1 as there is only one way to reach each cell in the first row and column.

• For each cell ...read more
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Q2. 
Most Frequent Word Problem Statement
You are given two strings 'A' and 'B' composed of words separated by spaces. Your task is to determine the most frequent and lexicographically smallest word in string ...read more
Ans. 
Find the most frequent and lexicographically smallest word in string 'A' that is not present in string 'B'.
• Split strings 'A' and 'B' into words

• Count frequency of each word in 'A'

• Check if word is not in 'B' and is the most frequent and lexicographically smallest

• Return the word or -1 if no such word exists
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Round duration - 90 Minutes
Round difficulty - Easy

timing was 4 pm . we connected on amazon chime. Initially he asked me a few things from resume then moved on to problem solving.

Q1. 
Number of Islands Problem Statement
You are provided with a 2-dimensional matrix having N rows and M columns, containing only 1s (land) and 0s (water). Your goal is to determine the number of islands in t...read more
Ans. 
Count the number of islands in a 2D matrix of 1s and 0s.
• Use Depth First Search (DFS) or Breadth First Search (BFS) to traverse the matrix and identify connected groups of 1s.

• Maintain a visited array to keep track of visited cells to avoid redundant traversal.

• Increment the island count each time a new island is encountered.

• Consider all eight possible directions for connectivity while traversing the matrix.

• Handle edge ca...read more
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Q2. 
Largest Rectangle in Histogram Problem Statement
You are given an array/list HEIGHTS of length N, where each element represents the height of a histogram bar. The width of each bar is considered to be 1.
...read more
Ans. 
Find the area of the largest rectangle that can be formed within the bounds of a given histogram.
• Iterate through the histogram bars and maintain a stack to keep track of increasing heights.

• Calculate the area of the rectangle formed by each bar as the smallest height in the stack times the width.

• Update the maximum area found so far and return it as the result.
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