Web Reference: Min Stack - Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. Sep 16, 2025 · Use two stacks: one to store actual stack elements and the other as an auxiliary stack to store minimum values. The idea is to do push () and pop () operations in such a way that the top of the auxiliary stack is always the minimum. To get the minimum value, this approach simply looks through all elements in the stack. Since a normal stack does not store any extra information about the minimum, the only way to find it is to temporarily remove every element, track the smallest one, and then put everything back.
YouTube Excerpt: Lecture 71 of DSA Placement Series Company wise DSA Sheet Link : https://docs.google.com/spreadsheets/d ...
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