deba@2549: /* -*- C++ -*-
deba@2549:  *
deba@2549:  * This file is a part of LEMON, a generic C++ optimization library
deba@2549:  *
alpar@2553:  * Copyright (C) 2003-2008
deba@2549:  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
deba@2549:  * (Egervary Research Group on Combinatorial Optimization, EGRES).
deba@2549:  *
deba@2549:  * Permission to use, modify and distribute this software is granted
deba@2549:  * provided that this copyright notice appears in all copies. For
deba@2549:  * precise terms see the accompanying LICENSE file.
deba@2549:  *
deba@2549:  * This software is provided "AS IS" with no warranty of any kind,
deba@2549:  * express or implied, and with no claim as to its suitability for any
deba@2549:  * purpose.
deba@2549:  *
deba@2549:  */
deba@2549: 
deba@2549: #include <iostream>
deba@2549: #include <sstream>
deba@2549: #include <vector>
deba@2549: #include <queue>
alpar@2569: #include <lemon/math.h>
deba@2549: #include <cstdlib>
deba@2549: 
deba@2549: #include "test_tools.h"
deba@2549: #include <lemon/smart_graph.h>
deba@2549: #include <lemon/max_matching.h>
deba@2549: #include <lemon/graph_reader.h>
deba@2549: 
deba@2549: UGRAPH_TYPEDEFS(SmartUGraph);
deba@2549: 
deba@2549: using namespace std;
deba@2549: using namespace lemon;
deba@2549: 
deba@2549: const int lgfn = 3;
deba@2549: const std::string lgf[lgfn] = {   
deba@2549:   "@nodeset\n"
deba@2549:   "label\n"
deba@2549:   "0\n"
deba@2549:   "1\n"
deba@2549:   "2\n"
deba@2549:   "3\n"
deba@2549:   "4\n"
deba@2549:   "5\n"
deba@2549:   "6\n"
deba@2549:   "7\n"
deba@2549:   "@uedgeset\n"
deba@2549:   "label        weight\n"
deba@2549:   "7    4       0       984\n"
deba@2549:   "0    7       1       73\n"
deba@2549:   "7    1       2       204\n"
deba@2549:   "2    3       3       583\n"
deba@2549:   "2    7       4       565\n"
deba@2549:   "2    1       5       582\n"
deba@2549:   "0    4       6       551\n"
deba@2549:   "2    5       7       385\n"
deba@2549:   "1    5       8       561\n"
deba@2549:   "5    3       9       484\n"
deba@2549:   "7    5       10      904\n"
deba@2549:   "3    6       11      47\n"
deba@2549:   "7    6       12      888\n"
deba@2549:   "3    0       13      747\n"
deba@2549:   "6    1       14      310\n"
deba@2549:   "@end\n",
deba@2549: 
deba@2549:   "@nodeset\n"
deba@2549:   "label\n"
deba@2549:   "0\n"
deba@2549:   "1\n"
deba@2549:   "2\n"
deba@2549:   "3\n"
deba@2549:   "4\n"
deba@2549:   "5\n"
deba@2549:   "6\n"
deba@2549:   "7\n"
deba@2549:   "@uedgeset\n"
deba@2549:   "label        weight\n"
deba@2549:   "2    5       0       710\n"
deba@2549:   "0    5       1       241\n"
deba@2549:   "2    4       2       856\n"
deba@2549:   "2    6       3       762\n"
deba@2549:   "4    1       4       747\n"
deba@2549:   "6    1       5       962\n"
deba@2549:   "4    7       6       723\n"
deba@2549:   "1    7       7       661\n"
deba@2549:   "2    3       8       376\n"
deba@2549:   "1    0       9       416\n"
deba@2549:   "6    7       10      391\n"
deba@2549:   "@end\n",
deba@2549: 
deba@2549:   "@nodeset\n"
deba@2549:   "label\n"
deba@2549:   "0\n"
deba@2549:   "1\n"
deba@2549:   "2\n"
deba@2549:   "3\n"
deba@2549:   "4\n"
deba@2549:   "5\n"
deba@2549:   "6\n"
deba@2549:   "7\n"
deba@2549:   "@uedgeset\n"
deba@2549:   "label        weight\n"
deba@2549:   "6    2       0       553\n"
deba@2549:   "0    7       1       653\n"
deba@2549:   "6    3       2       22\n"
deba@2549:   "4    7       3       846\n"
deba@2549:   "7    2       4       981\n"
deba@2549:   "7    6       5       250\n"
deba@2549:   "5    2       6       539\n"
deba@2549:   "@end\n"
deba@2549: };
deba@2549: 
deba@2549: void checkMatching(const SmartUGraph& ugraph,
deba@2549: 		   const SmartUGraph::UEdgeMap<int>& weight,
deba@2549: 		   const MaxWeightedMatching<SmartUGraph>& mwm) {
deba@2549:   for (SmartUGraph::UEdgeIt e(ugraph); e != INVALID; ++e) {
deba@2549:     if (ugraph.source(e) == ugraph.target(e)) continue;
deba@2549:     int rw = 
deba@2549:       mwm.nodeValue(ugraph.source(e)) + mwm.nodeValue(ugraph.target(e));
deba@2549: 
deba@2549:     for (int i = 0; i < mwm.blossomNum(); ++i) {
deba@2549:       bool s = false, t = false;
deba@2549:       for (MaxWeightedMatching<SmartUGraph>::BlossomIt n(mwm, i); 
deba@2549: 	   n != INVALID; ++n) {
deba@2549: 	if (ugraph.source(e) == n) s = true;
deba@2549: 	if (ugraph.target(e) == n) t = true;
deba@2549:       }
deba@2549:       if (s == true && t == true) {
deba@2549: 	rw += mwm.blossomValue(i);
deba@2549:       }
deba@2549:     }
deba@2549:     rw -= weight[e] * mwm.dualScale;
deba@2549: 
deba@2549:     check(rw >= 0, "Negative reduced weight");
deba@2549:     check(rw == 0 || !mwm.matching(e), 
deba@2549: 	  "Non-zero reduced weight on matching edge");
deba@2549:   }
deba@2549: 
deba@2549:   int pv = 0;
deba@2549:   for (SmartUGraph::NodeIt n(ugraph); n != INVALID; ++n) {
deba@2549:     if (mwm.matching(n) != INVALID) {
deba@2549:       check(mwm.nodeValue(n) >= 0, "Invalid node value");
deba@2549:       pv += weight[mwm.matching(n)];
deba@2549:       SmartUGraph::Node o = ugraph.target(mwm.matching(n));
deba@2549:       check(mwm.mate(n) == o, "Invalid matching");
deba@2549:       check(mwm.matching(n) == ugraph.oppositeEdge(mwm.matching(o)), 
deba@2549: 	    "Invalid matching");
deba@2549:     } else {
deba@2549:       check(mwm.mate(n) == INVALID, "Invalid matching");
deba@2549:       check(mwm.nodeValue(n) == 0, "Invalid matching");
deba@2549:     }
deba@2549:   }
deba@2549: 
deba@2549:   int dv = 0;
deba@2549:   for (SmartUGraph::NodeIt n(ugraph); n != INVALID; ++n) {
deba@2549:     dv += mwm.nodeValue(n);
deba@2549:   }
deba@2549: 
deba@2549:   for (int i = 0; i < mwm.blossomNum(); ++i) {
deba@2549:     check(mwm.blossomValue(i) >= 0, "Invalid blossom value");
deba@2549:     check(mwm.blossomSize(i) % 2 == 1, "Even blossom size");
deba@2549:     dv += mwm.blossomValue(i) * ((mwm.blossomSize(i) - 1) / 2);
deba@2549:   }
deba@2549: 
deba@2549:   check(pv * mwm.dualScale == dv * 2, "Wrong duality");
deba@2549: 
deba@2549:   return;
deba@2549: }
deba@2549: 
deba@2549: void checkPerfectMatching(const SmartUGraph& ugraph,
deba@2549: 			  const SmartUGraph::UEdgeMap<int>& weight,
deba@2549: 			  const MaxWeightedPerfectMatching<SmartUGraph>& mwpm) {
deba@2549:   for (SmartUGraph::UEdgeIt e(ugraph); e != INVALID; ++e) {
deba@2549:     if (ugraph.source(e) == ugraph.target(e)) continue;
deba@2549:     int rw = 
deba@2549:       mwpm.nodeValue(ugraph.source(e)) + mwpm.nodeValue(ugraph.target(e));
deba@2549: 
deba@2549:     for (int i = 0; i < mwpm.blossomNum(); ++i) {
deba@2549:       bool s = false, t = false;
deba@2549:       for (MaxWeightedPerfectMatching<SmartUGraph>::BlossomIt n(mwpm, i); 
deba@2549: 	   n != INVALID; ++n) {
deba@2549: 	if (ugraph.source(e) == n) s = true;
deba@2549: 	if (ugraph.target(e) == n) t = true;
deba@2549:       }
deba@2549:       if (s == true && t == true) {
deba@2549: 	rw += mwpm.blossomValue(i);
deba@2549:       }
deba@2549:     }
deba@2549:     rw -= weight[e] * mwpm.dualScale;
deba@2549: 
deba@2549:     check(rw >= 0, "Negative reduced weight");
deba@2549:     check(rw == 0 || !mwpm.matching(e), 
deba@2549: 	  "Non-zero reduced weight on matching edge");
deba@2549:   }
deba@2549: 
deba@2549:   int pv = 0;
deba@2549:   for (SmartUGraph::NodeIt n(ugraph); n != INVALID; ++n) {
deba@2549:     check(mwpm.matching(n) != INVALID, "Non perfect");
deba@2549:     pv += weight[mwpm.matching(n)];
deba@2549:     SmartUGraph::Node o = ugraph.target(mwpm.matching(n));
deba@2549:     check(mwpm.mate(n) == o, "Invalid matching");
deba@2549:     check(mwpm.matching(n) == ugraph.oppositeEdge(mwpm.matching(o)), 
deba@2549: 	  "Invalid matching");
deba@2549:   }
deba@2549: 
deba@2549:   int dv = 0;
deba@2549:   for (SmartUGraph::NodeIt n(ugraph); n != INVALID; ++n) {
deba@2549:     dv += mwpm.nodeValue(n);
deba@2549:   }
deba@2549: 
deba@2549:   for (int i = 0; i < mwpm.blossomNum(); ++i) {
deba@2549:     check(mwpm.blossomValue(i) >= 0, "Invalid blossom value");
deba@2549:     check(mwpm.blossomSize(i) % 2 == 1, "Even blossom size");
deba@2549:     dv += mwpm.blossomValue(i) * ((mwpm.blossomSize(i) - 1) / 2);
deba@2549:   }
deba@2549: 
deba@2549:   check(pv * mwpm.dualScale == dv * 2, "Wrong duality");
deba@2549: 
deba@2549:   return;
deba@2549: }
deba@2549: 
deba@2549: 
deba@2549: int main() {
deba@2549: 
deba@2549:   for (int i = 0; i < lgfn; ++i) {
deba@2549:     SmartUGraph ugraph;
deba@2549:     SmartUGraph::UEdgeMap<int> weight(ugraph);
deba@2549:     
deba@2549:     istringstream lgfs(lgf[i]);
deba@2549:     UGraphReader<SmartUGraph>(lgfs, ugraph).
deba@2549:       readUEdgeMap("weight", weight).run();
deba@2549: 
deba@2549:     MaxWeightedMatching<SmartUGraph> mwm(ugraph, weight);
deba@2549:     mwm.run();
deba@2549:     checkMatching(ugraph, weight, mwm);
deba@2549: 
deba@2549:     MaxMatching<SmartUGraph> mm(ugraph);
deba@2549:     mm.run();
deba@2549: 
deba@2549:     MaxWeightedPerfectMatching<SmartUGraph> mwpm(ugraph, weight);
deba@2549:     bool perfect = mwpm.run();
deba@2549: 
deba@2549:     check(perfect == (mm.size() * 2 == countNodes(ugraph)), 
deba@2549: 	  "Perfect matching found");
deba@2549: 
deba@2549:     if (perfect) {
deba@2549:       checkPerfectMatching(ugraph, weight, mwpm);
deba@2549:     }
deba@2549:   }
deba@2549:   
deba@2549:   return 0;
deba@2549: }