Web Reference: Min Stack - Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. In-depth solution and explanation for LeetCode 155. Min Stack in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. 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.
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