I doubt if it would work on the following example : size of array is
10, 5 and 7 are missing numbers
{1,2,3,4,6,6,6,8,9,10};
On Jul 20, 12:31 pm, Shubham Maheshwari <shubham.veloc...@gmail.com>
wrote:
> let A:: ((n(n+1)/2) - sum)
> let B:: ((n(n+1)(2n+1)/6) - (sum of squares of elements))
>
> then missing number = ((B/A) + A)/2;
>
> complexity O(n).
> space complexity O(1).
>
>
>
>
>
>
>
>
>
> On Wed, Jul 20, 2011 at 12:47 PM, saurabh singh <saurab...@gmail.com> wrote:
> > Q1 can be solved using some simple maths....:)
> > Hint:What is the sum of first n natural numbers?"And what is the sum of
> > squares of first n natural numbers?
>
> > On Wed, Jul 20, 2011 at 12:44 PM, siva viknesh
> > <sivavikne...@gmail.com>wrote:
>
> >> gn array - say a
>
> >> hav extra array - say b - initialise all values to zero
>
> >> ques 1:
>
> >> for(i=1;i<=n;i++)
> >> {
> >> b[a[i]]++;
>
> >> }
>
> >> then traverse b array and print i, for which b[i] = 2
>
> >> o(n) time & space
>
> >> same idea for ques 2
>
> >> ....better approaches please
>
> >> On Jul 20, 12:11 pm, siva viknesh <sivavikne...@gmail.com> wrote:
> >> > gn array - say a
>
> >> > hav extra array - say b - initialise all values to zero
>
> >> > ques 1:for(i=1;i<=n;i++)
> >> > {
> >> > b[a[i]]++;
>
> >> > }
>
> >> > On Jul 20, 12:07 pm, siva viknesh <sivavikne...@gmail.com> wrote:
>
> >> > > 1.Given an array of size n. It contains numbers in the range 1 to n.
> >> > > Each number is present at least once except for 2 numbers. Find the
> >> > > missing numbers.
>
> >> > > 2.Given an array of size n. It contains numbers in the range 1 to n.
> >> > > Find the numbers which aren’t present.
>
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> > --
> > Saurabh Singh
> > B.Tech (Computer Science)
> > MNNIT ALLAHABAD
>
> > --
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> --
> Shubham Maheshwari
> ShubZz
> O.o o.O
>
> enJoY ...!!!
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