for second problem, you can create a stack of having each element as a node
having the current value as well as pointer to the next smallest value
present below it. This can solve all 3 operations in constant time.

Thanks,
Anurag


On Tue, Jun 28, 2011 at 3:00 PM, vikas <mehta...@gmail.com> wrote:

> 1.Given an array of integers and another integer X - create an algorithm to
> determine if the sum of any two integers in the array would result in x
> 2. design a ADT to implement push(), pop() method as stack, and also has a
> getMinElement(). Require that getMinElement() is constant time but
> push()/pop() do not have to be constant time at first. Then for improvement,
> these three methods are all required to be constant time
>
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