Peek(S), isEmpty(S), and Pop are the stack operations that need O (1) time for a stack data structure based on arrays (S,e).
The operations are carried out in a precise order by a linear data structure. Using this approach, the final piece to be added will show up first. Consider a stack of dishes stacked on top of one another as a real representation. Because the plate we put last is on top and we remove the plate from the top, we can assert that the plate we put last comes out first.
The first item in the stack is returned by using push() to add a component to a stack and pop() to remove a stack top piece.
The isEmpty() method returns true if the stack is empty.
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