Question

Consider these functions: push() : push an element into the stack pop() : pop the top-of-the-stack element top() : returns the item stored in top-of-the-stack-node What will be the output after performing these sequence of operations (after performing top())

push(20);

push(4);

pop();

push(10);

push(6);

pop();

pop();

push(5);

top();

Answer 1

push(20);
stack: [20]

push(4);
stack: [20, 4]

pop();
Returns 4
stack: [20]

push(10);
stack: [20, 10]

push(6);
stack: [20, 10, 6]

pop();
Returns 6
stack: [20, 10]

pop();
Returns 10
stack: [20]

push(5);
stack: [20, 5]

top();
It returns 5
stack: [20, 5]