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.
