O.K can anyone suggest the combinatorial solution.I thought it this way- Assume k chairs as one chair.Now no. of ways arranging these chairs would be ((n-k+1)-1)! and the number of ways of arranging the k chairs would be k!. So the no. of ways of arranging the chairs so that they are always together becomes..(n-1)!-(n-k)!*(k)!? Where was I wrong in the approach?Please correct me,
On Mon, Jun 20, 2011 at 5:36 PM, RITESH SRIVASTAV <riteshkumar...@gmail.com>wrote: > @Saurabh > Your formula is incorrect. > for input : 5 2 > the answer should be 5 but your program gives 12 as output. > > On Jun 19, 11:35 pm, abc abc <may.i.answ...@gmail.com> wrote: > > @above Better you ask it on spoj forum > > > > On Sun, Jun 19, 2011 at 7:27 PM, saurabh singh <saurab...@gmail.com> > wrote: > > > I am getting WA for this problem.I dont know whether its case of > overflow > > > or I have come up with a wrong formula, > > >https://www.spoj.pl/problems/CHAIR/ > > > I am coding in python so I dont think there is probblem of overflow. > > > > > def f(n): > > > if n<0: > > > return 0 > > > if n==0: > > > return 1 > > > i=n > > > prod=1 > > > while i>0 : > > > prod*=i > > > i-=1 > > > return prod > > > n=input() > > > k=input() > > > if k==1: > > > print n > > > elif 2*k>n: > > > print 0 > > > else : > > > x=f(n-1) > > > y=f(n-k)*f(k) > > > print (x-y)%1000000003 > > > > > -- > > > Saurabh Singh > > > B.Tech (Computer Science) > > > MNNIT ALLAHABAD > > > > > -- > > > You received this message because you are subscribed to the Google > Groups > > > "Algorithm Geeks" group. > > > To post to this group, send email to algogeeks@googlegroups.com. > > > To unsubscribe from this group, send email to > > > algogeeks+unsubscr...@googlegroups.com. > > > For more options, visit this group at > > >http://groups.google.com/group/algogeeks?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To post to this group, send email to algogeeks@googlegroups.com. > To unsubscribe from this group, send email to > algogeeks+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > > -- Saurabh Singh B.Tech (Computer Science) MNNIT ALLAHABAD -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algogeeks@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
