Implement Stack Using Queues Leetcode RBR6aJvr9OM - Complete Information & Details

Web Reference: Implement Stack using Queues - Implement a last-in-first-out (LIFO) stack using only two queues. The implemented stack should support all the functions of a normal stack (push, top, pop, and empty). To simulate a stack using queues, we need to reverse the order of elements on each push. The idea is to use two queues: when pushing a new element, we add it to the empty second queue, then move all elements from the first queue behind it. Sep 18, 2025 · We will be using two queues (q1 and q2) to implement the stack operations. The main idea is to always keep the newly inserted element at the front of q1, so that both pop () and top () can directly access it.

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