1 | // Copyright (C) 2005, International Business Machines |
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2 | // Corporation and others. All Rights Reserved. |
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3 | #if defined(_MSC_VER) |
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4 | // Turn off compiler warning about long names |
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5 | # pragma warning(disable:4786) |
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6 | #endif |
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7 | |
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8 | #include <cassert> |
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9 | #include <iomanip> |
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10 | |
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11 | |
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12 | // For Branch and bound |
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13 | //#include "CbcStrategy.hpp" |
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14 | #include "OsiCbcSolverInterface.hpp" |
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15 | |
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16 | #include "CoinTime.hpp" |
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17 | |
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18 | //############################################################################# |
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19 | |
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20 | |
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21 | /************************************************************************ |
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22 | |
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23 | This main program reads in an integer model from an mps file. |
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24 | It then uses default strategy - just cuts at root node |
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25 | |
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26 | ************************************************************************/ |
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27 | |
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28 | int main (int argc, const char *argv[]) |
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29 | { |
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30 | |
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31 | // This would just do cuts at root |
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32 | // OsiCbcSolverInterface solver1; |
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33 | // This does cuts in tree and uses Clp |
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34 | CbcStrategyDefault strategy(false); |
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35 | OsiCbcSolverInterface solver1(NULL,&strategy); |
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36 | // Read in model using argv[1] |
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37 | // and assert that it is a clean model |
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38 | std::string mpsFileName; |
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39 | #if defined(SAMPLEDIR) |
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40 | mpsFileName = SAMPLEDIR "/p0033.mps"; |
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41 | #else |
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42 | if (argc < 2) { |
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43 | fprintf(stderr, "Do not know where to find sample MPS files.\n"); |
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44 | exit(1); |
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45 | } |
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46 | #endif |
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47 | if (argc>=2) mpsFileName = argv[1]; |
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48 | int numMpsReadErrors = solver1.readMps(mpsFileName.c_str(),""); |
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49 | assert(numMpsReadErrors==0); |
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50 | double time1 = CoinCpuTime(); |
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51 | // Do complete search |
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52 | |
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53 | solver1.branchAndBound(); |
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54 | |
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55 | std::cout<<mpsFileName<<" took "<<CoinCpuTime()-time1<<" seconds, " |
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56 | <<solver1.getNodeCount()<<" nodes with objective " |
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57 | <<solver1.getObjValue() |
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58 | <<(!solver1.status() ? " Finished" : " Not finished") |
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59 | <<std::endl; |
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60 | |
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61 | // Print solution if finished - we can't get names from Osi! |
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62 | |
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63 | if (solver1.getObjValue()*solver1.getObjSense()<1.0e50) { |
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64 | int numberColumns = solver1.getNumCols(); |
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65 | |
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66 | const double * solution = solver1.getColSolution(); |
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67 | |
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68 | int iColumn; |
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69 | std::cout<<std::setiosflags(std::ios::fixed|std::ios::showpoint)<<std::setw(14); |
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70 | |
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71 | std::cout<<"--------------------------------------"<<std::endl; |
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72 | for (iColumn=0;iColumn<numberColumns;iColumn++) { |
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73 | double value=solution[iColumn]; |
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74 | if (fabs(value)>1.0e-7&&solver1.isInteger(iColumn)) |
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75 | std::cout<<std::setw(6)<<iColumn<<" "<<value<<std::endl; |
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76 | } |
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77 | std::cout<<"--------------------------------------"<<std::endl; |
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78 | |
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79 | std::cout<<std::resetiosflags(std::ios::fixed|std::ios::showpoint|std::ios::scientific); |
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80 | } |
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81 | return 0; |
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82 | } |
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