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1 #ifndef DIMACS_HH |
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2 #define DIMACS_HH |
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3 |
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4 #include <iostream> |
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5 #include <string> |
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6 #include <vector> |
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7 |
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8 namespace hugo { |
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9 |
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10 template<typename Graph, typename CapacityMap> |
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11 void readDimacsMaxFlow(std::istream& is, Graph &G, typename Graph::NodeIt &s, typename Graph::NodeIt &t, CapacityMap& capacity) { |
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12 G.clear(); |
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13 int cap; |
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14 char d; |
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15 std::string problem; |
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16 char c; |
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17 int i, j; |
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18 std::string str; |
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19 int n, m; |
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20 std::vector<typename Graph::NodeIt> nodes; |
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21 while (is>>c) { |
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22 switch (c) { |
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23 case 'c': //comment |
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24 getline(is, str); |
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25 break; |
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26 case 't': //type |
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27 getline(is, str); |
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28 break; |
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29 case 'p': //problem definition |
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30 is >> problem >> n >> m; |
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31 getline(is, str); |
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32 nodes.resize(n+1); |
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33 for (int k=1; k<=n; ++k) nodes[k]=G.addNode(); |
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34 break; |
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35 case 'n': //node definition |
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36 if (problem=="sp") { //shortest path problem |
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37 is >> i; |
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38 getline(is, str); |
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39 s=nodes[i]; |
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40 } |
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41 if (problem=="max") { //max flow problem |
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42 is >> i >> d; |
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43 getline(is, str); |
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44 if (d=='s') s=nodes[i]; |
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45 if (d=='t') t=nodes[i]; |
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46 } |
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47 break; |
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48 case 'a': |
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49 is >> i >> j >> cap; |
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50 getline(is, str); |
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51 typename Graph::EdgeIt e=G.addEdge(nodes[i], nodes[j]); |
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52 capacity.update(); |
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53 capacity.set(e, cap); |
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54 break; |
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55 } |
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56 } |
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57 } |
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58 |
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59 } //namespace hugo |
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60 |
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61 #endif //DIMACS_HH |
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