Interview Master
Posts
🤯 FAANG asked this problem 31 times

🤯 FAANG asked this problem 31 times

ALSO: How GraphQL works

Interview Master
April 17, 2024

Welcome back, Interview Masters!

This week’s coding challenge is a fun one 😉

In today’s newsletter, we’ll cover:

Contains Duplicate Problem
What is GraphQL and how does it work?

Read time: under 4 minutes

`CODING CHALLENGE`

Contains Duplicate

Easy Amazon Apple Google Meta

Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.

Example 1:

Input: nums = [1,2,3,1]
Output: true

Example 2:

Input: nums = [1,2,3,4]
Output: false

Example 3:

Input: nums = [1,1,1,3,3,4,3,2,4,2]
Output: true

Solve the problem here before reading the solution.

`SOLUTION`

To solve this problem, we can use a set data structure to keep track of the unique elements encountered while iterating through the array.

If we encounter an element that is already present in the set, it means that the array contains a duplicate, and we can return True.

If we complete the iteration without finding any duplicates, we can return False.

The time complexity of the given code is O(n), where n is the number of elements in the input list nums.

`PRESENTED BY THE RUNDOWN AI`

Learn how to make AI work for you.

AI won’t take your job, but a person using AI might. That’s why 500,000+ professionals read The Rundown – the free newsletter that keeps you updated on the latest AI news and teaches you how to apply it in just 5 minutes a day.

Subscribe with one click.

`SYSTEM DESIGN EXPLAINED`

What is GraphQL and how does it work?

Source: Postman

GraphQL is a query language for APIs that allows clients to get exactly the data they need from a single endpoint.

Unlike REST APIs that require multiple requests, GraphQL reduces the number of round trips between client and server. It defines a schema for the data and gives developers a powerful way to query it.

Clients can request specific fields which improves the performance by fetching only the required data.

GraphQL is becoming increasingly popular for modern web and mobile applications. You can read the full article here.

`NEWS`

This week in the tech world

Source: Tenor

Tesla announces Layoffs: Tesla announces a staff reduction of over 10% after a disappointing Q1 delivery report. With Tesla’s headcount sitting at around 140,000 workers globally, the reduction is likely to affect at least 14,000 workers. The layoffs are seen by some analysts as an ominous sign for the company. Tesla stock fell in response to the news. Analysts believe slowing EV demand is to blame.

Andrew Ng joins Amazon: Amazon is sending a strong signal about its commitment to artificial intelligence by appointing Andrew Ng, a highly respected AI researcher, to its board of directors. Ng's background boasts impressive credentials, including serving as the former chief scientist at Baidu and founding Landing AI.

Top Amazon exec says robots don't steal jobs: Addressing a common myth that robots steal jobs, Amazon executive Stefano La Rovere argues that new technologies create more jobs than they take away. He says that robotics has enhanced more than 50,000 jobs in Amazon's fulfillment centers, and that new technologies create new job categories by reducing repetitive tasks and allowing workers to develop new skills.

LinkedIn bets on influencers to compete with Instagram and TikTok: LinkedIn expanded into influencer marketing with the launch of Thought Leader ads. This feature allows users to pay to promote posts from other creators, similar to influencer marketing on platforms like TikTok and Instagram. However, LinkedIn faces challenges due to its focus on professional content and its higher advertising costs.

Apple stock surges on AI optimism: Apple stock increased 4.3% last week, following a recent slide. Analysts believe this rise is due to hedge fund investors becoming more positive about Apple's potential for growth in AI, with new AI features expected to be announced later this year.