no we can divide also with in the same loop On Tue, Jun 21, 2011 at 3:20 PM, PRAMENDRA RATHi rathi <prathi...@gmail.com>wrote:
> @sunny if we calculate (n-r+1)*(n-r+2).....*n first and then divide this > value by r!.. > then this method will fail with little large value of n..because first > value will increase vry fast and will go out of limit.. > > > > > > > > > ----------------------------------------- > PRAMENDRA RATHI > NIT ALLAHABAD > > > > > > On Tue, Jun 21, 2011 at 2:52 PM, sunny agrawal <sunny816.i...@gmail.com>wrote: > >> DP is good when we need to use intermediate values too.. >> here we only need to compute nCr as a final result >> so we cannot use DP here >> >> the Logic Vandana used will be helpful here. >> >> as nCr = n! / r! * n-r! >> without loss of generality we can assume that r < n-r else we can just >> replace r = n-r >> >> then we need to compute is >> (n-r+1)*(n-r+2)*.........*(n) / 1.2.3.....r >> that can be computed in O(r) >> >> >> >> On Tue, Jun 21, 2011 at 2:04 PM, kartik sachan >> <kartik.sac...@gmail.com>wrote: >> >>> but for big numbers this method is very expensive................and hope >>> give TLE in 1 sec question where n=1000 >>> >>> -- >>> 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. >>> >> >> >> >> -- >> Sunny Aggrawal >> B-Tech IV year,CSI >> Indian Institute Of Technology,Roorkee >> >> -- >> 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. > -- Sunny Aggrawal B-Tech IV year,CSI Indian Institute Of Technology,Roorkee -- 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.
