@juvir++ it was mentioned in question not to use log or power. isnt there any approach using bitwise operators
On Fri, Jan 21, 2011 at 5:24 PM, Manmeet Singh <[email protected]>wrote: > this will be O(log(n) * log(n)) solution > > > On Fri, Jan 21, 2011 at 4:29 PM, abhijith reddy > <[email protected]>wrote: > >> Below is code for modular exponentation in general >> >> // (a^b)%c >> int modexp(int a,int b,int c) >> { >> int ans=1; >> while(b) >> { >> if(b&1) ans=(ans*a)%c; >> a=(a*a)%c; >> b>>=1; >> } >> return ans; >> >> } >> >> >> On Fri, Jan 21, 2011 at 3:27 PM, juver++ <[email protected]> wrote: >> >>> int l = 0, r = ...; >>> while (l < r) { >>> int m = (l + r) / 2; >>> int p = power(3, m); >>> if (p > M) r = m - 1; >>> else if (p < M) l = m + 1; >>> else print 3^m = M; >>> } >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Algorithm Geeks" group. >>> To post to this group, send email to [email protected]. >>> To unsubscribe from this group, send email to >>> [email protected]<algogeeks%[email protected]> >>> . >>> 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 [email protected]. >> To unsubscribe from this group, send email to >> [email protected]<algogeeks%[email protected]> >> . >> 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 [email protected]. > To unsubscribe from this group, send email to > [email protected]<algogeeks%[email protected]> > . > 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 [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
