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🔥 If you can't solve this coding problem...

🔥 If you can't solve this coding problem...

ALSO: How Discord uses code-splitting

Interview Master
April 10, 2024

Welcome back, Interview Masters!

We’ll do one of the most asked coding problems this week.

In today’s newsletter, we’ll cover:

Maximum Subarray problem
How Discord boosts performance with code-splitting

Read time: under 4 minutes

`CODING CHALLENGE`

Maximum Subarray

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Given an integer array nums, find the subarray with the largest sum, and return its sum.

Example 1:

Input: nums = [-2,1,-3,4,-1,2,1,-5,4]
Output: 6
Explanation: The subarray [4,-1,2,1] has the largest sum 6.

Example 2:

Input: nums = [1]
Output: 1
Explanation: The subarray [1] has the largest sum 1.

Example 3:

Input: nums = [5,4,-1,7,8]
Output: 23
Explanation: The subarray [5,4,-1,7,8] has the largest sum 23.

Solve the problem here before reading the solution.

`SOLUTION`

To solve this problem, we can use Kadane's algorithm. It's a dynamic programming approach where we keep track of the maximum sum subarray ending at each position in the array.

If the maximum sum of subarray ending at the current_index-1 is negative, we should start a new subarray with the current element. Otherwise, we should extend the maximum sum subarray ending at current_index-1.

The overall maximum sum subarray will be the maximum among all the maximum sum subarrays ending at each index.

The time complexity of this algorithm is O(n), where n is the number of elements in the nums array.

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`SYSTEM DESIGN EXPLAINED`

How Discord boosts performance with code-splitting

Discord maintains app performance by using code-splitting and lazy loading.

Code-splitting reduces the amount of code that needs to load at once. This makes the app load faster and use less memory.

Lazy loading means that parts of the app only load when they are needed. This reduces the amount of time it takes to load the app initially. You can dive deeper here.

`NEWS`

This week in the tech world

Source: icegif

Apple lays off over 600 people: Apple laid off over 600 employees after cancelling its electric car project. These are the first significant layoffs from Apple since the Covid pandemic. The laid-off employees included machine shop managers, hardware engineers and product design engineers.

Meta stock hits record high: Analysts are optimistic about Meta’s future, citing the company’s growing market share in digital advertising and its focus on artificial intelligence. Meta’s stock is up about 45% for the year after almost tripling in 2023.

Tesla to unveil robotaxi in August: Tesla announced a robotaxi reveal after years of missed deadlines. Tesla will reveal its design on August 8th, but faces competition from companies like Waymo who already offer driverless ride-hailing services in some cities.

India challenges China as Asia's tech hub: With tensions rising between the US and China, many companies are looking to diversify their manufacturing away from China. India, with its large talent pool, is seen as a viable alternative. However, India still faces challenges such as bureaucracy.

Intel unveils latest AI chip: Intel unveiled their new Gaudi 3 AI chip, aiming to compete with Nvidia's dominance in the market. Gaudi 3 promises better power efficiency and faster performance than Nvidia's current leader. This is part of a larger trend of companies expanding into the AI chip market.

Google unveils new chips: Google designed custom Arm-based chips called Axion for energy-efficient cloud computing. Axion will be used for Google's YouTube workloads and is available later in 2024.

OPEN JOBS