If the order is same then the nishaanth is right..
let have similar problem with no constrain on order
eg main string 12561465
and query string is 1 2 6 5
then output should be "1 2 5 6"
On Sat, Oct 23, 2010 at 11:23 PM, nishaanth <nishaant...@gmail.com> wrote:
> It is nothing but a common subsequence problem...isnt it ?
>
>
> On Wed, Oct 13, 2010 at 3:42 PM, Mridul Malpani
> <malpanimri...@gmail.com>wrote:
>
>> @ ankit agarwal, you are right. thanx man.
>>
>> On Oct 13, 11:37 am, prodigy <1abhishekshu...@gmail.com> wrote:
>> > Let I,Q be input array,query array respectively.
>> >
>> > 1. Sort query array. O(klogk)
>> > 2. Allocate an array A of size N.
>> > 3. Fill A such that A[i]= position of Q[i] in I, -1 if not present in
>> > I. O(nlogk)
>> > 4. Allocate an array B of size k with all elements initiated to -1.
>> > 5. for(counter=0,i=0,counter<n,i++)
>> > {
>> > if(B[i]==-1)
>> > counter++;
>> > if(A[i]!=-1)
>> > B[A[i]] = i
>> > }
>> > 6. Build min-heap of B.(use an auxiliary array C to keep track of
>> > position of last occurence of an element of Q in min-heap B.)
>> > 7. for(diff=i-B[1] ; i<n; i++)
>> > if(A[i]!=-1)
>> > B[C[A[i]] = i
>> > //percolate up or down if needed
>> > diff=max(diff,i-B[1]);
>> >
>> > 8. print diff
>> >
>> > On Oct 7, 1:20 pm, RAHUL KUJUR <kujurismonu2...@gmail.com> wrote:
>> >
>> >
>> >
>> > > @prodigy: how is it coming O(nlogk) can u explain???
>>
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>
>
> --
> S.Nishaanth,
> Computer Science and engineering,
> IIT Madras.
>
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With Regards
Ankur Aggarwal
+91-7838289304
Software Engineer
Slideshare
Delhi
INDIA.
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