merge

Combines two sorted ranges into an output range
Is stable
 int  main()  {
         int  even[ ]  =  {0, 2, 4, 6, 8, 10};
         int  odd[ ]  =  {1, 3, 5, 7, 9, 11};
         merge(odd,  odd + 6,
                  even,  even + 6,
                  ostream_iterator<int>(cout, "  "));
 }