Computer Science – 19.1 Algorithms | e-Consult
19.1 Algorithms (1 questions)
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A stack can be implemented using a list (or array). The list provides a sequence of elements, and by restricting access to the elements to only the head (top) of the list, we can emulate the Last-In, First-Out (LIFO) behaviour of a stack.
The key operations required are:
- Push: Adding an element to the top of the stack. This involves adding the new element to the head of the list. The time complexity of a push operation using a list is typically O(1), assuming the list has sufficient capacity.
- Pop: Removing the element from the top of the stack. This involves removing the head element from the list. The time complexity of a pop operation using a list is typically O(1).
- Peek: Examining the top element of the stack without removing it. This involves accessing the head element of the list. The time complexity of a peek operation using a list is O(1).
- IsEmpty: Checking if the stack is empty. This involves checking if the list has no elements. The time complexity of an isEmpty operation using a list is O(1).
The use of a list allows for efficient stack operations by maintaining a clear indication of the top element. The simplicity of the list data structure makes this implementation straightforward.