Prefix Sum in Java for Beginners | Placement Ready | TechPillars

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In this video, we will understand the Prefix Sum technique in Java — one of the most powerful tools to optimize range sum queries from O(n) to O(1).

If you are preparing for coding interviews, placements, or competitive programming, Prefix Sum is a must-know concept.

What you will learn in this video:

• What is Prefix Sum
• Why brute force is inefficient
• How Prefix Sum works
• Java implementation step-by-step
• Solving range sum queries in constant time
• Interview tips and common mistakes

Prefix Sum is widely used in array problems, subarray problems, and competitive programming. Once you master this technique, many problems become simple and efficient.

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