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schurs-lemma.cpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2011
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9  * Last modified:
10  * $Date: 2011-07-08 20:09:31 +1000 (Fri, 08 Jul 2011) $ by $Author: schulte $
11  * $Revision: 12164 $
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37 
38 #include <gecode/driver.hh>
39 #include <gecode/int.hh>
40 #include <gecode/minimodel.hh>
41 
42 using namespace Gecode;
43 
48 class SchurOptions : public Options {
49 public:
50  int c, n;
51 
52  SchurOptions(const char* s, int c0, int n0)
53  : Options(s), c(c0), n(n0) {}
55  void parse(int& argc, char* argv[]) {
56  Options::parse(argc,argv);
57  if (argc < 3)
58  return;
59  c = atoi(argv[1]);
60  n = atoi(argv[2]);
61  }
63  virtual void help(void) {
64  Options::help();
65  std::cerr << "\t(unsigned int) default: " << c << std::endl
66  << "\t\tparameter c (number of boxes)" << std::endl
67  << "\t(unsigned int) default: " << n << std::endl
68  << "\t\tparameter n (number of balls)" << std::endl;
69  }
70 };
71 
72 
87 class Schur : public Script {
88 protected:
91 public:
93  Schur(const SchurOptions& opt) : box(*this,opt.n,1,opt.c) {
94  int n = opt.n;
95 
96  IntVarArgs triple(3);
97 
98  // Iterate over balls and find triples
99  for (int i=1; i<=n; i++) {
100  triple[0] = box[i-1];
101  for (int j=1; i+j<=n; j++) {
102  triple[1] = box[j-1];
103  triple[2] = box[i+j-1];
104  rel(*this, triple, IRT_NQ);
105  }
106  }
107 
108  // Break value symmetries
109  precede(*this, box, IntArgs::create(opt.c, 1));
110 
112  }
114  virtual void
115  print(std::ostream& os) const {
116  os << "\t" << box << std::endl;
117  }
118 
120  Schur(bool share, Schur& s) : Script(share,s) {
121  box.update(*this, share, s.box);
122  }
124  virtual Space*
125  copy(bool share) {
126  return new Schur(share,*this);
127  }
128 };
129 
133 int
134 main(int argc, char* argv[]) {
135  SchurOptions opt("Schur's Lemma",3,13);
136  opt.parse(argc,argv);
137  Script::run<Schur,DFS,SchurOptions>(opt);
138  return 0;
139 }
140 
141 // STATISTICS: example-any
142