python on Instagram: "The functions associated with stack are: empty() – Returns whether the stack is empty – Time Complexity: O(1) size() – Returns the size of the stack – Time Complexity: O(1) top() / peek() – Returns a reference to the topmost element of the stack – Time Complexity: O(1) push(a) – Inserts the element ‘a’ at the top of the stack – Time Complexity: O(1) pop() – Deletes the topmost element of the stack – Time Complexity: O(1) #python #python3 #java #javadeveloper #pythondevelope