////   This file contains the C++ code from Program 12.24 of//   "Data Structures and Algorithms//    with Object-Oriented Design Patterns in C++"//   by Bruno R. Preiss.////   Copyright (c) 1998 by Bruno R. Preiss, P.Eng.  All rights reserved.////   http://www.pads.uwaterloo.ca/Bruno.Preiss/books/opus4/programs/pgm12_24.cpp//void EquivalenceClasses (){    unsigned int n;    cin >> n;    Partition& p = *new PartitionAsForest (n);    unsigned int i;    unsigned int j;    while (cin >> i >> j, !cin.eof ())    {	Set& s = p.Find (Set::Element (i)));	Set& t = p.Find (Set::Element (j)));	if (s != t)	    p.Join (s, t);	else	    cout << "redundant pair: "		<< i << ", " << j << endl;    }    cout << p << endl;    delete &p;}