ElementType Find( List L, int m )  {      List p1 = L;     List p2 = L;      List pLast = NULL;      int c = 0;      while (p1) {          if (c == m) {              p2 = L;          }          p1 = p1->Next;          p2 = p2->Next;          pLast = p2;          c++;      }      if (c > m)        return pLast->Data;      else          return -1; }

　　

ElementType Find( List L, int m )  {      List pCurrent = L;     List pFind = L;          for (int i =0; i
     
      Next;        else            return -1;     while (pCurrent) {        pFind = pFind->Next;        pCurrent = pCurrent->Next;    }    return pFind->Data;}