HackerRank Stack Quiz-3

We know that the stack follows LIFO order, so when we apply pop() operation on items from stack, they come out in reverse order of their insertion (push()).

The compiler uses the stack to implement recursion. In the forwarding phase, the values of local variables, parameters and the return address are pushed into the stack at each recursion level. In the backing-out phase, the stacked address is popped and used to execute the rest of the code.

For all the standard stack operations (push, pop, isEmpty, size), the worst-case run-time complexity can be O(1).

Number of elements present in stack is equal to the difference between number of push operations and subtract number of pop operations. Number of elements is 6-5=1

The Tower of Hanoi involves moving of disks ‘stacked’ at one peg to another peg with respect to the size constraint.

When we insert element in the stack the element goes last of the stack and element follows LIFO order for pop() operation.