see sum is total no.of elements in three arrays. the question is middle element in the merged array.
so the middle element would be at index sum/2. Sanju :) On Sun, Aug 21, 2011 at 10:46 AM, Puneet Chawla <[email protected]>wrote: > @sanjay why you have compared k with sum/2 is it a general solution..??? > > > On Sun, Aug 21, 2011 at 11:11 PM, vaibhav shukla > <[email protected]>wrote: > >> @sanjay : yes this is one approach . just doing this and keeping track of >> the smaller element and wen k is sum/2, the minimum element of the middle on >> >> >> true. but any other approach apart from this and wat if the total length >> is even, i.e u have to give two middle elements then >> >> >> On Sun, Aug 21, 2011 at 11:09 PM, vaibhav shukla <[email protected] >> > wrote: >> >>> @puneet : but u cant use extra memory >>> >>> >>> On Sun, Aug 21, 2011 at 11:08 PM, Sanjay Rajpal <[email protected]>wrote: >>> >>>> Take three pointers to the beginning of each array say i,j,k. >>>> >>>> Now let sum = len a +len b + len c. >>>> k=0 >>>> >>>> now start from the beginning, compare elements at indexes i,j,k. >>>> which ever is smaller, increment that index and k, continue till k >>>> becomes sum/2. >>>> >>>> when k becomes sum/2, this element will be middle element of the merged >>>> array. >>>> >>>> I think it could also be done in O(log m + log n + log p), where m, n,p >>>> are lengths of the arrays. >>>> >>>> Correct me if m wrong :) >>>> Sanju >>>> :) >>>> >>>> >>>> >>>> On Sun, Aug 21, 2011 at 10:34 AM, Puneet Chawla < >>>> [email protected]> wrote: >>>> >>>>> Here by just applying merge on these array as they are sorted and >>>>> calculate the middle element..Am i rt..??? >>>>> >>>>> >>>>> On Sun, Aug 21, 2011 at 10:59 PM, vaibhav shukla < >>>>> [email protected]> wrote: >>>>> >>>>>> given three sorted arrays not necessary of same length (length is >>>>>> given) >>>>>> we have to determine the middle element such that the element will be >>>>>> the middle one of the such an array which will be formed if all three >>>>>> given >>>>>> arrays are merged in >>>>>> sorted order. >>>>>> input :- arr1 : 1,3,5,7 >>>>>> arr2 : 6,9,12,15,18 >>>>>> arr3 : 2,4,14,20 >>>>>> output : 7 , as if we merge the arrays in sorted order then 7 will be >>>>>> the middle element of that merged array. >>>>>> note : if merged array is of even length then there will be two middle >>>>>> element. >>>>>> >>>>>> ALSO YOU CANNOT USE EXTRA MEMORY. >>>>>> >>>>>> >>>>>> -- >>>>>> best wishes!! >>>>>> Vaibhav >>>>>> >>>>>> >>>>>> -- >>>>>> 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. >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> With regards >>>>> ............ >>>>> Puneet Chawla >>>>> Computer Engineering Student >>>>> NIT Kurukshetra >>>>> >>>>> -- >>>>> 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. >>>>> >>>> >>>> -- >>>> 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. >>>> >>> >>> >>> >>> -- >>> best wishes!! >>> Vaibhav >>> MCA >>> >>> >> >> >> -- >> best wishes!! >> Vaibhav >> MCA >> >> -- >> 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. >> > > > > -- > With regards > ............ > Puneet Chawla > Computer Engineering Student > NIT Kurukshetra > > -- > 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. > -- 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.
