Web Reference: 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). This problem asks you to implement a stack data structure using only two queues. A stack follows Last-In-First-Out (LIFO) principle, while a queue follows First-In-First-Out (FIFO) principle. 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).
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