Answer / swetcha

A stack is a collection of items in which only the most
recently added item may be removed. The latest added item
is at the top. Basic operations are push and pop. Often top
and isEmpty are available, too. Also known as "last-in,
first-out" or LIFO.

Answer / kanchan

stack is one of the data strucure, in which we can add and
remove item on the principle of last in first out(LIFO)...

Answer / aravindh.r

Stack data structures refer to the lists stored and accessed
in a special way where LIFO(Last In First Out) technique is
followed.In stacks,insertion and deletions take place only
at the end,called TOP.

Answer / r.narendran

stack is a collection of items,it is also one data structure
in that we can add and remove item or insertion and deletion
progress takes place on the principle of "LIFO".

Answer / jaya kumar e

stack is one of the data strucure, in which we can add and 
remove data or item on the principle of (LIFO) last in first out.

if there are n nodes in a binary tree, how many null pointers are there?

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