1 | #include <iostream> |
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2 | |
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3 | #include <lemon/list_graph.h> |
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4 | #include <lemon/dijkstra.h> |
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5 | //#include <lemon/graph_writer.h> |
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6 | |
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7 | using namespace lemon; |
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8 | |
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9 | |
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10 | int main (int, char*[]) |
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11 | { |
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12 | |
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13 | typedef ListGraph Graph; |
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14 | typedef Graph::Node Node; |
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15 | typedef Graph::Edge Edge; |
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16 | typedef Graph::EdgeMap<int> LengthMap; |
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17 | |
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18 | Graph g; |
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19 | |
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20 | //An example from Ahuja's book |
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21 | |
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22 | Node s=g.addNode(); |
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23 | Node v2=g.addNode(); |
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24 | Node v3=g.addNode(); |
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25 | Node v4=g.addNode(); |
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26 | Node v5=g.addNode(); |
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27 | Node t=g.addNode(); |
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28 | |
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29 | Edge s_v2=g.addEdge(s, v2); |
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30 | Edge s_v3=g.addEdge(s, v3); |
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31 | Edge v2_v4=g.addEdge(v2, v4); |
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32 | Edge v2_v5=g.addEdge(v2, v5); |
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33 | Edge v3_v5=g.addEdge(v3, v5); |
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34 | Edge v4_t=g.addEdge(v4, t); |
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35 | Edge v5_t=g.addEdge(v5, t); |
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36 | |
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37 | LengthMap len(g); |
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38 | |
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39 | len.set(s_v2, 10); |
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40 | len.set(s_v3, 10); |
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41 | len.set(v2_v4, 5); |
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42 | len.set(v2_v5, 8); |
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43 | len.set(v3_v5, 5); |
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44 | len.set(v4_t, 8); |
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45 | len.set(v5_t, 8); |
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46 | |
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47 | std::cout << "This program is a simple demo of the LEMON Dijkstra class."<<std::endl; |
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48 | std::cout << "We calculate the shortest path from node s to node t in a graph."<<std::endl; |
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49 | std::cout <<std::endl; |
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50 | |
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51 | |
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52 | std::cout << "The id of s is " << g.id(s)<< ", the id of t is " << g.id(t)<<"."<<std::endl; |
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53 | |
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54 | std::cout << "Dijkstra algorithm test..." << std::endl; |
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55 | |
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56 | |
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57 | Dijkstra<Graph, LengthMap> dijkstra_test(g,len); |
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58 | |
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59 | dijkstra_test.run(s); |
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60 | |
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61 | |
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62 | std::cout << "The distance of node t from node s: " << dijkstra_test.dist(t)<<std::endl; |
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63 | |
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64 | std::cout << "The shortest path from s to t goes through the following nodes (the first one is t, the last one is s): "<<std::endl; |
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65 | |
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66 | for (Node v=t;v != s; v=dijkstra_test.predNode(v)){ |
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67 | std::cout << g.id(v) << "<-"; |
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68 | } |
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69 | std::cout << g.id(s) << std::endl; |
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70 | |
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71 | |
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72 | return 0; |
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73 | } |
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