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Today’s problem is every man’s dream. Let’s see if you get it or not.

Today we will cover:

• 3Sum

• Circuit Breaker Pattern

Read time: under 4 minutes

CODING CHALLENGE

3Sum

Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j != k, and nums[i] + nums[j] + nums[k] == 0.

Notice that the solution set must not contain duplicate triplets.

Example 1:

Input: nums = [-1,0,1,2,-1,-4]
Output: [[-1,-1,2],[-1,0,1]]
Explanation: 
nums[0] + nums[1] + nums[2] = (-1) + 0 + 1 = 0.

nums[1] + nums[2] + nums[4] = 0 + 1 + (-1) = 0.

nums[0] + nums[3] + nums[4] = (-1) + 2 + (-1) = 0.

The distinct triplets are [-1,0,1] and [-1,-1,2].

Example 2:

Input: nums = [0,1,1]
Output: []
Explanation: The only possible triplet does not sum up to 0.

Solve the problem here before reading the solution.

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SOLUTION

To solve this problem, we will sort the array first. This will help us avoid duplicates. It would also enable us to use the two pointer approach. Let’s explain this in more detail.

The idea is to iterate the array and then find two other elements that sum up to -nums[i]. This would mean that nums[i] plus these two numbers would be 0. This will give us a valid triplet for the answer.

We will use the ‘twoSum’ function to find these two numbers. We would only look for the numbers to the right of the nums[i] to avoid duplicates. Since the array is sorted, we can use two pointers to find the numbers efficiently.

Sorting has a time complexity of O(n log n). Nested for loops have a time complexity of O(n^2). Since O(n^2) is bigger than O(n log n), overall time complexity is O(n^2).

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SYSTEM DESIGN

Circuit Breaker Pattern

When your application calls external services, a lot can go wrong. Services can be slow, unresponsive, or completely down. Without proper handling, these failures can cascade through your system, making everything slow or unusable. The Circuit Breaker pattern prevents this by detecting failures and avoiding unnecessary calls to failing services.

Let’s say you’re calling an external service that's experiencing issues. Each call might take 30 seconds to timeout, and your application makes hundreds of such calls. Your users would face long delays, and your system's resources would be tied up waiting for responses that will never come.

The Circuit Breaker works like an electrical circuit breaker. It monitors for failures. When failures reach a threshold, the circuit "trips" and prevents further calls to the failing service. Instead, it fails fast by returning an error immediately. After a set time, it allows a few test calls to check if the service has recovered.

The Circuit Breaker has three states:

1. Closed: Normal operation, calls pass through

2. Open: Calls fail fast without attempting to execute

3. Half-Open: Allows a limited number of test calls to check recovery

Implementation is straightforward. You track the number of recent failures. When failures exceed a threshold (say 5 failures in 10 seconds), you open the circuit. After a timeout period (maybe 1 minute), you switch to half-open and allow test calls. If these succeed, close the circuit; if they fail, reopen it.

Here's how you might use a Circuit Breaker:

// 5 failures, 1 minute timeout
CircuitBreaker breaker = new CircuitBreaker(5, 60000); 

try {
    breaker.execute(() -> externalService.call());
} catch (CircuitBreakerOpenException e) {
    // Handle failure fast scenario
}

The Circuit Breaker pattern pairs well with fallbacks. When the circuit is open, you can return cached data, default values, or use alternative services instead of failing completely.

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NEWS

This Week in the Tech World

Meta Signs Multi-Billion Nvidia Chip Deal: Meta will deploy millions of Nvidia GPUs and standalone Grace CPUs across its data centers. This is the first large-scale Grace CPU-only deployment.

Anthropic Launches Claude Sonnet 4.6: Anthropic released Sonnet 4.6 with a 1M token context window and improved coding and computer use. It's now the default model for Free and Pro users.

Anthropic Raises $30B at $380B Valuation: Anthropic closed a $30B Series G round, more than doubling its valuation since September. Revenue run-rate is now $14B, growing 10x annually.

OpenAI Drops GPT-5.3-Codex-Spark: OpenAI released a lightweight Codex model running on Cerebras hardware, streaming over 1,000 tokens per second. It's designed for real-time coding.

Google Launches Gemini 3 Deep Think: Google released its advanced reasoning model, Gemini 3 Deep Think, stepping up competition in the AI reasoning space against OpenAI and Anthropic.

Chrome Zero-Day Actively Exploited: Google patched CVE-2026-2441, a use-after-free bug in Chrome's CSS component being exploited in the wild. This is the first Chrome zero-day of 2026.

GitHub Ships Agentic Workflows: GitHub launched Agentic Workflows, letting developers describe outcomes in Markdown and run them as coding agents via GitHub Actions with built-in guardrails.

BeyondTrust RCE Flaw Under Attack: Attackers are exploiting CVE-2026-1731, a critical pre-auth RCE in BeyondTrust Remote Support. About 8,500 on-prem instances remain potentially vulnerable.

Half of xAI's Founding Team Has Left: Six of xAI's 12 original co-founders have now departed, including two who exited this week. The departures come amid Grok issues and an impending IPO.

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