Guys please check correctness of your algorithm before posting
On Mon, Jan 31, 2011 at 11:47 PM, ritu <ritugarg.c...@gmail.com> wrote:
> @Ralph
> "Build a data structure on array B[1..n] in O(n) time such that
> > the following problem can be solved in O(log n) time:
> > Given an index i and value v, find the index j of the first
> > element in B such that j >= i and B[j] > v.
> > Return -1 if no such j exists.
> > "
>
> then it ll take n*lg(n) time ... while a o(n) solution exists
>
> On Jan 31, 9:25 pm, Ralph Boland <rpbol...@gmail.com> wrote:
> > On Jan 30, 11:00 pm, ritu <ritugarg.c...@gmail.com> wrote:
> >
> > > You are given an array (unsorted) and for every element i, find the
> > > first occurance of an element j (in the remaining array) that is
> > > greater than or equal to i. If no such j occurs then print -1.
> > > Eg: Input---> A={1,3,5,7,6,4,8}
> > > Output---> 3 5 7 8 8 8 -1
> > > Time Complexity:O(n)
> > > Space Complexity:O(n)
> >
> > I solved a version of this problem in my thesis.
> >
> > Build a data structure on array B[1..n] in O(n) time such that
> > the following problem can be solved in O(log n) time:
> > Given an index i and value v, find the index j of the first
> > element in B such that j >= i and B[j] > v.
> > Return -1 if no such j exists.
> >
> > I have an application of this data structure in my thesis (which
> > is why I invented it) but I would love to hear other applications.
> >
> > Ralph Boland
>
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