Stack algorithm
The stack algorithm is a type of data structure in computer science and software engineering. It follows the Last In First Out (LIFO) principle, meaning that the most recent element added to the stack is the first one to be removed. The two main operations performed on a stack are \"push\" and \"pop.\"\n\n- Push: This operation adds an element to the top of the stack.\n- Pop: This operation removes the top element from the stack.\n\nHere's a simple example of how the stack algorithm works:\n\n1. Create an empty stack\n\n2. Perform the following operations:\n   - Push 5\n   - Push 6\n   - Push 7\n\nNow, the stack looks like this (from bottom to top): 5, 6, 7\n\n3. Perform the \"pop\" operation: this will remove the top element, which is 7.\n\nThe stack will now look like this: 5, 6\n\n4. Perform another \"pop\" operation: this will remove the top element, which is 6.\n\nThe stack will now look like this: 5\n\n5. Perform a final \"pop\" operation: this will remove the top element, which is 5.\n\nThe stack is now empty.\n\nSome common applications of stack algorithms include:\n\n- In recursive algorithms, where function calls are nested, and their return values must be stored and processed in reverse order.\n- In parsing and evaluating mathematical expressions, where the priority of operators must be taken into account.\n- In undo and redo operations in software applications, where actions can be reversed in the order they were performed.\n\nIn summary, the stack algorithm is a versatile and essential concept in computer science, used to store and manage data following the Last In First Out principle.