/* -*- C++ -*-

  * test/kruskal_test.cc - Part of LEMON, a generic C++ optimization library

  *

  * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Research Group on Combinatorial Optimization, EGRES).

  *

  * Permission to use, modify and distribute this software is granted

  * provided that this copyright notice appears in all copies. For

  * precise terms see the accompanying LICENSE file.

  *

  * This software is provided "AS IS" with no warranty of any kind,

  * express or implied, and with no claim as to its suitability for any

  * purpose.

  *

  */

 #include <iostream>

 #include <vector>

 #include "test_tools.h"

 #include <lemon/maps.h>

 #include <lemon/kruskal.h>

 #include <lemon/list_graph.h>

 #include <lemon/concept/maps.h>

 #include <lemon/concept/graph.h>

 using namespace std;

 using namespace lemon;

 void checkCompileKruskal()

 {

   concept::WriteMap<concept::StaticGraph::Edge,bool> w;

   kruskalEdgeMap(concept::StaticGraph(),

 		 concept::ReadMap<concept::StaticGraph::Edge,int>(),

 		 w);

 }

 int main() {

   typedef ListGraph::Node Node;

   typedef ListGraph::Edge Edge;

   typedef ListGraph::NodeIt NodeIt;

   typedef ListGraph::EdgeIt EdgeIt;

   ListGraph G;

   Node s=G.addNode();

   Node v1=G.addNode();

   Node v2=G.addNode();

   Node v3=G.addNode();

   Node v4=G.addNode();

   Node t=G.addNode();

   Edge e1 = G.addEdge(s, v1);

   Edge e2 = G.addEdge(s, v2);

   Edge e3 = G.addEdge(v1, v2);

   Edge e4 = G.addEdge(v2, v1);

   Edge e5 = G.addEdge(v1, v3);

   Edge e6 = G.addEdge(v3, v2);

   Edge e7 = G.addEdge(v2, v4);

   Edge e8 = G.addEdge(v4, v3);

   Edge e9 = G.addEdge(v3, t);

   Edge e10 = G.addEdge(v4, t);

   typedef ListGraph::EdgeMap<int> ECostMap;

   typedef ListGraph::EdgeMap<bool> EBoolMap;

   ECostMap edge_cost_map(G, 2);

   EBoolMap tree_map(G);

   //Test with const map.

   check(kruskalEdgeMap(G, ConstMap<ListGraph::Edge,int>(2), tree_map)==10,

 	"Total cost should be 10");

   //Test with a edge map (filled with uniform costs).

   check(kruskalEdgeMap(G, edge_cost_map, tree_map)==10,

 	"Total cost should be 10");

   edge_cost_map.set(e1, -10);

   edge_cost_map.set(e2, -9);

   edge_cost_map.set(e3, -8);

   edge_cost_map.set(e4, -7);

   edge_cost_map.set(e5, -6);

   edge_cost_map.set(e6, -5);

   edge_cost_map.set(e7, -4);

   edge_cost_map.set(e8, -3);

   edge_cost_map.set(e9, -2);

   edge_cost_map.set(e10, -1);

   vector<Edge> tree_edge_vec;

   //Test with a edge map and inserter.

   check(kruskalEdgeMap_IteratorOut(G, edge_cost_map,

 				   back_inserter(tree_edge_vec))

 	==-31,

 	"Total cost should be -31.");

   tree_edge_vec.clear();

   //The above test could also be coded like this:

   check(kruskal(G,

 		makeKruskalMapInput(G, edge_cost_map),

 		makeKruskalSequenceOutput(back_inserter(tree_edge_vec)))

 	==-31,

 	"Total cost should be -31.");

   check(tree_edge_vec.size()==5,"The tree should have 5 edges.");

   check(tree_edge_vec[0]==e1 &&

 	tree_edge_vec[1]==e2 &&

 	tree_edge_vec[2]==e5 &&

 	tree_edge_vec[3]==e7 &&

 	tree_edge_vec[4]==e9,

 	"Wrong tree.");

   return 0;

 }