Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:20:12 2012 Optimize a model with 824 rows, 177 columns and 1648 nonzeros Presolve removed 182 rows and 0 columns Presolve time: 0.00s Presolved: 642 rows, 177 columns, 1415 nonzeros Variable types: 0 continuous, 177 integer (177 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 7.065000e+01, 380 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 70.65000 0 162 52.00000 70.65000 35.9% - 0s 0 0 69.14286 0 160 52.00000 69.14286 33.0% - 0s 0 0 68.76431 0 174 52.00000 68.76431 32.2% - 0s 0 0 67.87600 0 174 52.00000 67.87600 30.5% - 0s 0 0 67.62199 0 173 52.00000 67.62199 30.0% - 0s 0 0 67.24987 0 176 52.00000 67.24987 29.3% - 0s 0 0 66.83212 0 175 52.00000 66.83212 28.5% - 0s 0 0 66.69348 0 176 52.00000 66.69348 28.3% - 0s 0 0 66.58990 0 177 52.00000 66.58990 28.1% - 0s 0 0 66.53751 0 176 52.00000 66.53751 28.0% - 0s 0 0 66.49727 0 175 52.00000 66.49727 27.9% - 0s 0 0 66.38428 0 175 52.00000 66.38428 27.7% - 0s 0 0 66.27287 0 176 52.00000 66.27287 27.4% - 0s 0 0 66.21412 0 176 52.00000 66.21412 27.3% - 0s 0 0 66.05770 0 176 52.00000 66.05770 27.0% - 0s 0 0 66.00218 0 177 52.00000 66.00218 26.9% - 0s 0 0 65.97768 0 177 52.00000 65.97768 26.9% - 0s 0 0 65.97768 0 177 52.00000 65.97768 26.9% - 0s H 0 0 54.0000000 65.97768 22.2% - 0s 0 2 65.97731 0 177 54.00000 65.97731 22.2% - 0s H 49 31 55.0000000 65.83245 19.7% 64.3 0s H 64 35 56.0000000 65.36722 16.7% 62.2 0s 612 279 59.20000 18 176 56.00000 63.24186 12.9% 52.0 5s 1894 705 57.21739 22 107 56.00000 62.13830 11.0% 49.0 10s 4393 1713 58.52273 15 136 56.00000 60.84146 8.65% 40.4 15s 8017 2451 58.68566 24 133 56.00000 59.91071 6.98% 35.5 20s 12500 2694 57.00000 43 102 56.00000 59.16883 5.66% 32.5 25s 16855 2213 cutoff 25 56.00000 58.50000 4.46% 31.0 30s Cutting planes: Gomory: 3 Zero half: 89 Explored 22307 nodes (648094 simplex iterations) in 34.19 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0%