@Bharath I dont think BinSrch on diagnol and then on row works. Can u explain your algo? chk for this matrix
1 2 3 4 5 2 9 12 19 24 3 10 14 18 20 8 13 15 20 23 11 14 16 21 24 Find(8) doesn't give o/p --Koushik C On Wed, Nov 25, 2009 at 5:18 PM, Arun <arunm...@gmail.com> wrote: > how about splitting the matrix into 4 squares and considering the rightmost > bottom and comparing it to topmost left corner of each square. in every > iteration you will eliminate atleast one square. so worst case, you have to > repeat this divide and conquer on the three other squares. > not good as as binary search though(in the sense of eliminating 2 squares). > > > On Wed, Nov 25, 2009 at 3:12 AM, Aditya Shankar < > iitm.adityashan...@gmail.com> wrote: > >> >> >> On Wed, Nov 25, 2009 at 2:16 PM, Bharath <bharath1...@gmail.com> wrote: >> >>> You can actually do it in O(logn) complexity. Binary Search on diagonal >>> and then on a row. >> >> Will that always work? >> 1 2 3 >> 3 5 6 >> 4 7 8 >> >> Find(6) fails with the usual binary search algorithm. >> >> >>> >>> >>> On Tue, Nov 24, 2009 at 10:33 PM, chitta koushik < >>> koushik.infin...@gmail.com> wrote: >>> >>>> Start from top right or bottom left corner and move according if the >>>> element to be searched is lesser or greater than current. >>>> >>>> >>>> --Koushik C >>>> Pablo >>>> Picasso<http://www.brainyquote.com/quotes/authors/p/pablo_picasso.html> - >>>> "Computers are useless. They can only give you answers." >>>> >>>> >>>> On Tue, Nov 24, 2009 at 7:27 PM, Rohit Saraf < >>>> rohit.kumar.sa...@gmail.com> wrote: >>>> >>>>> A nice problem that i encountered : >>>>> In O(n) search for a value x in a sorted NxN matrix. >>>>> Definition of sorted matrix: All rows and all columns are sorted in >>>>> ascending order. >>>>> >>>>> So thought of sharing .. >>>>> >>>>> >>>>> Rohit Saraf >>>>> Sophomore >>>>> Computer Science and Engineering >>>>> IIT Bombay >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Algorithm Geeks" group. >>>>> To post to this group, send email to algoge...@googlegroups.com. >>>>> To unsubscribe from this group, send email to >>>>> algogeeks+unsubscr...@googlegroups.com<algogeeks%2bunsubscr...@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 algoge...@googlegroups.com. >>>> To unsubscribe from this group, send email to >>>> algogeeks+unsubscr...@googlegroups.com<algogeeks%2bunsubscr...@googlegroups.com> >>>> . >>>> For more options, visit this group at >>>> http://groups.google.com/group/algogeeks?hl=en. >>>> >>> >>> >>> >>> -- >>> <<Bharath>> >>> >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Algorithm Geeks" group. >>> To post to this group, send email to algoge...@googlegroups.com. >>> To unsubscribe from this group, send email to >>> algogeeks+unsubscr...@googlegroups.com<algogeeks%2bunsubscr...@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 algoge...@googlegroups.com. >> To unsubscribe from this group, send email to >> algogeeks+unsubscr...@googlegroups.com<algogeeks%2bunsubscr...@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 algoge...@googlegroups.com. > To unsubscribe from this group, send email to > algogeeks+unsubscr...@googlegroups.com<algogeeks%2bunsubscr...@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 algoge...@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.
