Next Greater Element | Brute Force + Monotonic Stack (Optimized) | Python, C++, Java
In this video, we solve the classic Next Greater Element problem from GFG.
We start with the brute force approach to understand how to find the next greater element for each index, and then move to the optimized monotonic stack solution for an efficient linear-time approach.
You will learn:
What is the next greater element and how it works
Brute force approach and its limitations
Optimized approach using monotonic decreasing stack
Why we traverse from right to left
How stack helps eliminate unnecessary comparisons
Time complexity improvement from O(n²) to O(n)
Clean and interview-ready code in Python, C++, and Java
This is a fundamental stack problem and a must-know pattern for many advanced questions like circular arrays, stock span, and daily temperatures.
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