rec_merge(apvector & A, int s , int mid, int f)
	{
			apvector int temp( A[0]+1, 0)
			int ptrA=s, ptrb=mid+1, ptrc=s;


			loop---

			if ptr a> mid
					temp [ptrc]= a[ ptrb];
					ptrc++;
					ptrB++;

			else
				if ptrb>f
					if a[ptra]<