Twilio Interview Questions

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Find Shortest Palindrome Possible

We have a string str like the following: js const str "bubble" Find a way to convert it to a palindrome by inserting characters in front of it. Recall that a palindrome is defined as "a word, phrase, or sequence that reads the same backward as forward". What's the shortes...

Difficulty: 5/10

The Coin Change Problem

If I give you coins of denominations 3, 7, 9 a coin worth 3 cents, a coin worth 7 cents, etc. , can you tell me the minimum number of coins that are needed to make a total of 37 ? You can assume that an infinite supply of all these coins are available to you. This challenge is about so...

Difficulty: 8/10

Invert a Binary Tree

Can you invert a binary tree over its vertical axis? This is a famous problem made popular by this tweet: Google: 90 of our engineers use the software you wrote Homebrew , but you can t invert a binary tree on a whiteboard so f**k off. mdash Max Howell mxcl June 10, 2015 Given a binary t...

Difficulty: 7/10

Maximum Sum of Absolute Difference of Values and Indices

The Puzzle in Simple Terms You have a list of numbers called A . Your task is to pick two numbers from this list, let's call them A i and A j . Additionally, you will take note of their positions, i and j , in the list. You are to find the biggest result you can get from a specific formu...

Difficulty: 7/10

Subsets Summing Zero

Given an array of positive and negative integers like the following: js const arr 3, 5, 2, 4, 7, 1, 6, 8, 8, 4 Can you write a method findSumZeroSubsets to return the starting and ending indexes of all subarrays in it that sum up to zero? **Note**: There are 3 terms that...

Difficulty: 7/10

Fizz Buzz

Fizz Buzz is a classic interview question that apparently many experienced engineering candidates often can't solve! Let's cover it today. We're given a number in the form of an integer n . Write a function that returns the string representation of all numbers from 1 to n based on the followin...

Difficulty: 3/10

Text Justification

Can you justify input text represented by an array of words so it looks pretty when printed and the whitespaces are balanced? For example, in the above image, we have an input array of "wow", "so", "cool", "is", "algodaily!" . This is a list of words we need to properly arrange, with the ideal ...

Difficulty: 9/10

Climbing the Word Ladder

Imagine two words placed at the two ends of a ladder. Can you reach one word from another using intermediate words as rings of the ladder? Each successive or transition word has a difference of only one letter from its predecessor, and must belong to a provided dictionary. Can we achieve this using t...

Difficulty: 7/10

Targets and Vicinities

You're playing a game with a friend called **Target and Vicinity**. *Target and Vicinity* consists of one person thinking up a number in their head, and the other guessing that number. Sounds simple enough the caveat is that we also want to credit close guesses. To estimate the proximity of the ...

Difficulty: 6/10

Best Programming Projects for Resume

When you are either eyeing a job you really like, or you are a junior, ready to start boosting your professional career, you need something to show off to your recruiters. Having a great portfolio can do wonders when it comes to finding a job and nailing an interview for a couple of reasons: It...

Difficulty: 5/10

Design AirBnb Tutorial (Systems Design, Architecture)

What is AirBnb? AirBnb is one of the most popular platforms for accommodation listing and booking. Every homeowner can list their space for rental, and users can book private accommodations and even experiences throughout the whole world. Services like Airbnb allow a smooth and customizable book...

Difficulty: 5/10

JavaScript Basics

Introduction to JavaScript JavaScript is a lightweight, text based programming language that adds interactivity to websites. It cannot execute independently, that is, it requires the support of another language HTML for execution. Here's an example of a simple JavaScript program: js con...

Difficulty: 5/10

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