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Leetcode 716. Max Stack

Design a stack that supports push, pop, top, peekMax, and popMax (which removes the most recently added maximum element if there are duplicates). The challenge is to maintain fast retrieval and removal of the current maximum even when it isn't at the top, so choose data structures that allow efficient max lookup and deletion.

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Late November, 2025

Confluent

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Early October, 2025

Staff

Proposed a two-stack approach as a solution. The interviewer asked for an optimal solution using a heap.

Mid September, 2025

Staff

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