Opendoor Interview Questions

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Sum of Perfect Squares

A perfect square is a number made by squaring a whole number. Some examples include 1 , 4 , 9 , or 16 , and so on because they are the squared results of 1 , 2 , 3 , 4 , etc. For example: 1 2 1 2 2 4 3 2 9 4 2 16 ... However, 15 is not a perfect square, bec...

Difficulty: 7/10

Detect Substring in String

How would you write a function to detect a substring in a string? If the substring can be found in the string, return the index at which it starts. Otherwise, return 1 . js function detectSubstring str, subStr return 1 Important do not use the native String clas...

Difficulty: 4/10

Length of String Compression

Let's define the "compacting" of a string as taking an input like the following: 'sstttrrrr' . We want to take the number of sequential appearances number of times it shows up in a row of each letter: s: 2 t: 3 r: 4 And denote them next to the original character in the string,...

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

Is A Subsequence

Given two strings, one named sub and the other str , determine if sub is a subsequence of str . js const str "barbell" const sub "bell" isASubsequence sub, str true For the sake of the exercise, let's assume that these strings only have lower case characters. W...

Difficulty: 5/10

Shortest Path Distance in Matrix

You are given a 2D matrix with several characters contained in its cells. You will also have two distinct characters which are guaranteed to be in the given matrix. Your job will be to find the minimum manhattan distance lessons what is the manhattan distance between the two characters in the mat...

Difficulty: 8/10

Max Rectangle in a Histogram

We're given a histogram like the following, where contiguous sharing a common border or touching bars are made up of different heights. Let's assume all bars have the same width. The histogram is converted to an array of the heights of the bars: js const histArr 3, 1, 4, 2, 2, 1 ...

Difficulty: 8/10

Two Stack Queue

Building a Queue with Two Stacks: A Challenge in Engineering Elegance The Objective: Queue with Stacks In this challenge, your task is to implement a queue using two stacks. While many programming languages offer queues through arrays or lists, we're restricting our approach to only utilize ...

Difficulty: 6/10

Counting Univalued Subtrees

Question Can you count all the univalued subtrees in a binary tree, as shown in the figure below? The Problem We are given a binary tree. The challenge is to count all the univalued subtrees in the tree. Just to recall, a subtree is any node along with its descendants. The root...

Difficulty: 6/10

Introduction to Redux

Introduction to Redux Redux is a state management library that works well with JavaScript applications, including React. It provides a predictable state container and helps manage the state of an application in a centralized manner. The core concept of Redux involves three main components: the...

Difficulty: 5/10

Introduction to Arrays and Array Operations

In this lesson, we will discuss the concept of arrays, with a focus on the following key points, 1. What are arrays, and how are they implemented? 2. Working with array operations in Python. For the Javascript version of this lesson, please click here https: algodaily.com lessons introdu...

Difficulty: 5/10

File Handling and I/O operations

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Difficulty: 5/10

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Hard work is rewarded. I got several raises, bonuses, and promotions in my first two years at Opendoor. I just received a $7000 bonus for working hard during COVID-19.

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