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Flatiron Health Interview Questions

Note: ensure you read the disclaimer on the previous page reading the accuracy and sourcing of these problems.

Array Intersection

As we ease our way into the course, we'll want to start with the basic data structures and their operations. However, don't be fooled how fundamental these things are! Interviewers will often test you on things that are deceptively easy. We saw this in Reverse a String challenges reverse a stri...

Difficulty: 2/10

Sorted Two Sum

The setup is the same as Two Sum challenges two sum you're given an array of numbers, and a "goal" number. Write a method to return an array of the indexes of the two elements in the array that sum up to the goal. If there are no such elements, return an empty array. The caveat here is th...

Difficulty: 5/10

Implement the Trie Data Structure

Suppose you're asked during an interview to design an autocompletion system. On the client side, you have an input box. When users start typing things into the input, it should parse what's been typed and make suggestions based on that. For example, if the user has typed "cat", we may fetch "c...

Difficulty: 7/10

Closures and Dependency Injection

In JavaScript, closures and dependency injection are powerful concepts that enable modular, maintainable, and flexible code. In this challenge, you will explore these concepts by implementing a specific functionality using closures and then using closures for dependency injection. **Part 1: C...

Difficulty: 6/10

Delete Nodes From A Linked List

Now that we've implemented a linked list challenges implement a linked list , can you write a method that will delete all nodes of a given value? You're given the following standard structure as the definition of a linked list node: js class LinkedListNode constructor val ...

Difficulty: 4/10

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

Power of Three

Given an integer num , write a method to determine if it is a power of 3. The method will be called as follows: js console.log powerOfThree 9 true console.log powerOfThree 7 false Constraints The given would be a non zero positive integer in the ran...

Difficulty: 3/10

Find in Shifted Sorted Matrix

Understanding the Matrix Shift Problem Suppose you have a matrix where each row and column is sorted in ascending order. Your task is to apply two specific types of shifts, described below, and locate a given element x in the transformed matrix. Shift Types **Left Circular Shift l :** ...

Difficulty: 8/10

Dollar Sign Deletion

You're given an array of strings containing alphabetical characters and certain characters. A represents a DELETE action whereby the character before it is deleted. Each of these strings will be run through a method to operate on the DELETE action. We want to find out if the final string...

Difficulty: 4/10

Dijkstra's Algorithm

Introduction to Data Structures In the field of robotics and computer vision, data structures play a crucial role in organizing and managing data efficiently. They provide a way to store and process data in a structured manner, enabling easier manipulation and analysis. For example, consider a...

Difficulty: 5/10

Designing a Storage Layer (Ephemeral or Persistent)

Introduction Design of a storage layer is a challenging task. Fortunately data management is a mature discipline with a variety of solutions available to accommodate various use cases. Unfortunately there is no single solution that can fit all use cases well, hence we need to understand why cer...

Difficulty: 5/10

Introduction to State Machines and Examples

Introduction You may have heard of a concept of state machines or more formally **finite state machines**. But what are they? State machines serve as a mechanism to transition something from one state to the other. They have three key components: **States** are the possible configurations s...

Difficulty: 5/10