The Dutch Flag problem falls into the same category as radix sort,
which is not a comparison-based sorting algorithm.
Don


On Jan 23, 1:26 am, atul anand <[email protected]> wrote:
> Hi all,
>
>     as we all know that any sorting algorithm based on comparison model has
> lower bound of nlogn i.e Omega(nlogn).
> which can be proved mathematically.
>
> but as we all know dutch flag problem can sort 3 distinct elements (used
> repeatedly) in O(n) time.It is also based on comparison model but can sort
> in O(n) time.
> so how can we justify lower bound of sorting based on comparison model ,
> because dutch flag problem kinda violates that.
>
> please help me understanding the difference.....
>
> Thanks

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