Max Circular Subarray Sum – DSA Trick FAANG Loves to Ask!

🔁 Maximum Circular Subarray Sum – Crack This Tricky DSA Pattern!
This is not your typical subarray problem – this one adds a circular twist. In this tutorial, we’ll break down how to find the maximum sum of a circular subarray using an elegant trick on top of Kadane’s Algorithm.

It’s a favorite in FAANG interviews and often asked by companies like Amazon, Google, and Microsoft to test how well you understand edge cases and optimizations.

✅ You’ll Learn:

How to apply Kadane’s Algorithm to both normal and circular cases

The logic behind “total sum - min subarray” trick

How to handle edge cases like all negative numbers

Clean and optimized Python code for interviews

🎯 Perfect For:

DSA learners prepping for coding interviews

Candidates targeting top product companies

Anyone brushing up on array-based problem-solving

🧠 Difficulty: Medium to Hard
💻 Language: Python (fully explained step-by-step)

🚀 This is one of those problems where a small trick = big breakthrough.
Master it and impress your interviewer with deep problem-solving insight.

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00:00 Problem Statement
02:35 Solution Explanation
03:33 Maximum Contiguous subarray sum
05:54 Maximum Circular subarray sum
07:55 Time & Space Complexity
10:18 Final Code