What is the temporal or computational index of the operation of extracting an element from a stack?

The operation of removing an element from the stack (pop operation) has a time complexity of O(1), meaning it is performed in constant time. This is because a stack is a data structure with access only to the top element, and removal occurs without the need to traverse or shift other elements.

Example in Java:

Stack<Integer> stack = new Stack<>();
stack.push(10);
stack.push(20);
int top = stack.pop(); // removes 20 in O(1)