test/kruskal_test.cc
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     1 /* -*- C++ -*-
       
     2  *
       
     3  * This file is a part of LEMON, a generic C++ optimization library
       
     4  *
       
     5  * Copyright (C) 2003-2008
       
     6  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
       
     7  * (Egervary Research Group on Combinatorial Optimization, EGRES).
       
     8  *
       
     9  * Permission to use, modify and distribute this software is granted
       
    10  * provided that this copyright notice appears in all copies. For
       
    11  * precise terms see the accompanying LICENSE file.
       
    12  *
       
    13  * This software is provided "AS IS" with no warranty of any kind,
       
    14  * express or implied, and with no claim as to its suitability for any
       
    15  * purpose.
       
    16  *
       
    17  */
       
    18 
       
    19 #include <iostream>
       
    20 #include <vector>
       
    21 
       
    22 #include "test_tools.h"
       
    23 #include <lemon/maps.h>
       
    24 #include <lemon/kruskal.h>
       
    25 #include <lemon/list_graph.h>
       
    26 
       
    27 #include <lemon/concepts/maps.h>
       
    28 #include <lemon/concepts/digraph.h>
       
    29 #include <lemon/concepts/graph.h>
       
    30 
       
    31 
       
    32 using namespace std;
       
    33 using namespace lemon;
       
    34 
       
    35 void checkCompileKruskal()
       
    36 {
       
    37   concepts::WriteMap<concepts::Digraph::Arc,bool> w;
       
    38   concepts::WriteMap<concepts::Graph::Edge,bool> uw;
       
    39 
       
    40   concepts::ReadMap<concepts::Digraph::Arc,int> r;
       
    41   concepts::ReadMap<concepts::Graph::Edge,int> ur;
       
    42 
       
    43   concepts::Digraph g;
       
    44   concepts::Graph ug;
       
    45 
       
    46   kruskal(g, r, w);
       
    47   kruskal(ug, ur, uw);
       
    48 
       
    49   std::vector<std::pair<concepts::Digraph::Arc, int> > rs;
       
    50   std::vector<std::pair<concepts::Graph::Edge, int> > urs;
       
    51 
       
    52   kruskal(g, rs, w);
       
    53   kruskal(ug, urs, uw);
       
    54 
       
    55   std::vector<concepts::Digraph::Arc> ws;
       
    56   std::vector<concepts::Graph::Edge> uws;
       
    57 
       
    58   kruskal(g, r, ws.begin());
       
    59   kruskal(ug, ur, uws.begin());
       
    60 
       
    61 }
       
    62 
       
    63 int main() {
       
    64 
       
    65   typedef ListGraph::Node Node;
       
    66   typedef ListGraph::Edge Edge;
       
    67   typedef ListGraph::NodeIt NodeIt;
       
    68   typedef ListGraph::ArcIt ArcIt;
       
    69 
       
    70   ListGraph G;
       
    71 
       
    72   Node s=G.addNode();
       
    73   Node v1=G.addNode();
       
    74   Node v2=G.addNode();
       
    75   Node v3=G.addNode();
       
    76   Node v4=G.addNode();
       
    77   Node t=G.addNode();
       
    78   
       
    79   Edge e1 = G.addEdge(s, v1);
       
    80   Edge e2 = G.addEdge(s, v2);
       
    81   Edge e3 = G.addEdge(v1, v2);
       
    82   Edge e4 = G.addEdge(v2, v1);
       
    83   Edge e5 = G.addEdge(v1, v3);
       
    84   Edge e6 = G.addEdge(v3, v2);
       
    85   Edge e7 = G.addEdge(v2, v4);
       
    86   Edge e8 = G.addEdge(v4, v3);
       
    87   Edge e9 = G.addEdge(v3, t);
       
    88   Edge e10 = G.addEdge(v4, t);
       
    89 
       
    90   typedef ListGraph::EdgeMap<int> ECostMap;
       
    91   typedef ListGraph::EdgeMap<bool> EBoolMap;
       
    92 
       
    93   ECostMap edge_cost_map(G, 2);
       
    94   EBoolMap tree_map(G);
       
    95   
       
    96 
       
    97   //Test with const map.
       
    98   check(kruskal(G, ConstMap<ListGraph::Edge,int>(2), tree_map)==10,
       
    99 	"Total cost should be 10");
       
   100   //Test with a edge map (filled with uniform costs).
       
   101   check(kruskal(G, edge_cost_map, tree_map)==10,
       
   102 	"Total cost should be 10");
       
   103 
       
   104   edge_cost_map.set(e1, -10);
       
   105   edge_cost_map.set(e2, -9);
       
   106   edge_cost_map.set(e3, -8);
       
   107   edge_cost_map.set(e4, -7);
       
   108   edge_cost_map.set(e5, -6);
       
   109   edge_cost_map.set(e6, -5);
       
   110   edge_cost_map.set(e7, -4);
       
   111   edge_cost_map.set(e8, -3);
       
   112   edge_cost_map.set(e9, -2);
       
   113   edge_cost_map.set(e10, -1);
       
   114 
       
   115   vector<Edge> tree_edge_vec(5);
       
   116 
       
   117   //Test with a edge map and inserter.
       
   118   check(kruskal(G, edge_cost_map,
       
   119 		 tree_edge_vec.begin())
       
   120 	==-31,
       
   121 	"Total cost should be -31.");
       
   122   
       
   123   tree_edge_vec.clear();
       
   124 
       
   125   check(kruskal(G, edge_cost_map,
       
   126 		back_inserter(tree_edge_vec))
       
   127 	==-31,
       
   128 	"Total cost should be -31.");
       
   129   
       
   130 //   tree_edge_vec.clear();
       
   131   
       
   132 //   //The above test could also be coded like this:
       
   133 //   check(kruskal(G,
       
   134 // 		makeKruskalMapInput(G, edge_cost_map),
       
   135 // 		makeKruskalSequenceOutput(back_inserter(tree_edge_vec)))
       
   136 // 	==-31,
       
   137 // 	"Total cost should be -31.");
       
   138 
       
   139   check(tree_edge_vec.size()==5,"The tree should have 5 edges.");
       
   140 
       
   141   check(tree_edge_vec[0]==e1 &&
       
   142 	tree_edge_vec[1]==e2 &&
       
   143 	tree_edge_vec[2]==e5 &&
       
   144 	tree_edge_vec[3]==e7 &&
       
   145 	tree_edge_vec[4]==e9,
       
   146 	"Wrong tree.");
       
   147 
       
   148   return 0;
       
   149 }