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Introduction to Monotonic Stack
Last Updated: June 4, 2026
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9 min read
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What is a Monotonic Stack?
How to Implement a Monotonic Stack?
Why It Is O(n) Despite the Nested While Loop
Four Variants: Next/Previous Greater/Smaller
Strict vs Non-Strict Comparison
The Sentinel Trick
Monotonic Stack vs Monotonic Deque
Classic Problems
Why Store Indices Instead of Values
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