# MOST COMMON Airbnb CODING INTERVIEW QUESTIONS

###### The 15 most asked questions in a airbnb interview

After COVID-19, when tourism almost ended, everybody thought it would be all downhill for Airbnb. Instead, it came out stronger and now has more than 150 billion users worldwide. Such big companies have challenging criteria for hiring. Especially if you’re prepping for Airbnb coding interview questions, they might not look like a piece of cake for you.

Interview preparation is the most crucial part of a software developer’s life. We’ve seen many talented engineers failing the interviews because they did not prepare well for them. But with the right guidance and path, you can definitely succeed in an Airbnb coding interview. Let’s start with some of the most common Airbnb interview questions to help you practice well.

###### ARRAYS

Arrays are fundamental data structures that allow for efficient storage and retrieval of elements in a sequential manner. The interviewee assesses the candidates on arrays to ensure they grasp core programming concepts. It also allows them to set their problem-solving skills, algorithmic thinking, and ability to manipulate and process data efficiently.

Move zeros to the left

__Problem statement__

Given an integer array, move all elements that are equal to 0 to the left while maintaining the order of other elements in the array.

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Merge overlapping intervals

__Problem statement__

Given a list of intervals, merge all the overlapping intervals to produce a list that has only mutually exclusive intervals.

###### LINKED LISTS

If you’re going to give a coding interview in a product-based company (like Airbnb or Facebook), go through linked list concepts again because interviewers are more likely to ask questions about linked lists. They do so for the following reasons:

To evaluate your problem-solving skills

To demonstrate your ability to decompose complex tasks

To assess how candidates will deal with empty lists, handle loops, and manage pointers.

Add two integers

__Problem statement__

Given the head pointers of two linked lists where each linked list represents an integer number (each node is a digit), add them and return the resulting linked list.

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Merge two sorted linked lists

__Problem statement__

Given two sorted linked lists, merge them so that the resulting linked list is also sorted.

###### TREES

Trees questions in Airbnb coding interviews help identify candidates with a strong foundation in __data structures__ and algorithmic reasoning and help evaluate their ability to organize and traverse data efficiently. For that reason, look at the questions below to practice well for your Airbnb interview questions.

Convert binary tree to doubly linked list

__Problem statement__

Convert a binary tree to a doubly linked list so that the order of the doubly linked list is the same as an in-order traversal of the binary tree. After conversion, the left pointer of the node should be pointing to the previous node in the doubly linked list, and the right pointer should be pointing to the next node in the doubly linked list.

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Level order traversal of binary tree

__Problem statement__

Given a binary tree and a number ‘S’, find all paths from root-to-leaf such that the sum of all the node values of each path equals ‘S’.

###### STRINGS

Just like arrays, strings are also one of the core programming concepts. It is crucial to have a strong grasp of strings to perform well in your Airbnb coding interview. Some commonly asked questions that can help you prepare well are mentioned below.

Reverse words in a sentence

__Problem statement__

Reverse the order of words in a given sentence (an array of characters).

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String segmentation

__Problem statement__

Given a dictionary of words and an input string tell whether the input string can be completely segmented into dictionary words.

###### DYNAMIC PROGRAMMING

__Dynamic programming __is a powerful technique that helps solve complex problems, including overlapping subproblems. Big companies like Airbnb are looking for more than just expert programmers. They are focusing on efficient solution providers, and dynamic programming questions help them evaluate which candidate will be well-suited for the position.

Find maximum single sell profit

__Problem statement__

Given a list of daily stock prices (integers for simplicity), return the buy and sell prices for making the maximum profit. We need to maximize the single buy/sell profit. If we can't make any profit, we'll try to minimize the loss.

###### MATH AND STATS

If you’re applying for a __data scientist __position, there are great chances you will face math and statistics questions in your Oracle coding interview. Mathematical and statistical knowledge is crucial for various data-driven tasks, including data analysis, modeling, and optimization. So it is important to get your hands dirty and practice well.

Calculate the power of a number

__Problem statement__

Given a double, 'x', and an integer, 'n', write a function to calculate 'x' raised to the power 'n'.

###### BACKTRACKING

Backtracking is another common topic when it comes to Airbnb coding interview questions. There are multiple types of backtracking questions, such as:

Decision-making questions: Finding a feasible solution

Optimization questions: Identifying the best solution

Enumeration questions: Identifying all possible solutions to a problem

For practice, here’s a quick backtracking question for you.

Find all possible subsets

__Problem statement__

You are given a set of integers and you have to find all the possible subsets of this set of integers.

###### GRAPHS

Graph questions are included in the __coding interviews__ to assess the capabilities of solving real-world problems. Like all FAANG companies, Airbnb interview questions also have graph questions to evaluate the candidate’s capabilities.

Clone a directed graph

__Problem statement__

There is a dictionary containing words from an alien language for which we don’t know the ordering of the characters. Write a method to find the correct order of characters in the alien language.

###### DESIGN

The Oracle coding interview often asks design questions to check the candidate’s ability to design robust solutions and scalable systems. Design questions allow interviewers to assess your performance architecture and technical infrastructure abilities.

Serialize / deserialize binary tree

__Problem statement__

Serialize a binary tree to a file and then deserialize it back to a tree so that the original and the deserialized trees are identical.

###### SORTING AND SEARCHING

Sorting and searching questions are asked to analyze a candidate’s understanding of different levels of sorting and searching. Some important topics that you must have a strong grasp on are:

Merge sort

Quick sort

Binary Search and more

To practice your sorting and searching skills, solve the questions below:

Find the high and low index

__Problem statement__

Given a sorted array of integers, return the low and high index of the given key. Return -1 if not found. The array length can be in the millions with many duplicates.

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Search rotated array

__Problem statement__

Search for a given number in a sorted array that has been rotated by some arbitrary number.

###### CONCLUSION

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After in-depth research and analysis, we’ve compiled a list of questions to help you prepare well for Airbnb coding interview questions. Record your time and try solving the questions within a limited time frame to test your skills. To practice more, check out the links below: