Implement Stack using Queue
Learning DSA practice problem on Onlearn.
Difficulty: medium.
Topics: Implementing a Stack using a Single Queue, Stack, Queue, Data Structures, Time Complexity, Space Complexity, fifo/lifo properties, space complexity, queue operations, stack, queue, data structures, time complexity analysis, Stack (LIFO), Queue (FIFO), Data Simulation, Data Structure Operations.
Implement Stack using Queue Problem Statement Implement a Stack data structure using a single Queue. The stack should support the following operations: push(x): Inserts element x onto the top of the stack. pop(): Removes and returns the element currently at the top of the stack. top(): Returns the element currently at the top of the stack without removing it. size(): Returns the number of elements in the stack. Recall that a Stack follows the Last In First Out (LIFO) principle, where the last element added is the first one to be removed. A Queue follows the First In First Out (FIFO) principle, where the first element added is the first one to be removed. Example Consider the following sequence of operations: s.top() should return 1. s.size() should return 4. s.pop() should return 1. s.top() should return 4. s.size() should return 3. Output corresponding to the example operations: