Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:55:09 2012 Optimize a model with 845 rows, 185 columns and 1690 nonzeros Presolve removed 188 rows and 0 columns Presolve time: 0.01s Presolved: 657 rows, 185 columns, 1444 nonzeros Variable types: 0 continuous, 185 integer (185 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 7.235294e+01, 370 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 72.35294 0 177 48.00000 72.35294 50.7% - 0s H 0 0 52.0000000 72.35294 39.1% - 0s 0 0 70.87436 0 180 52.00000 70.87436 36.3% - 0s 0 0 70.14533 0 180 52.00000 70.14533 34.9% - 0s H 0 0 53.0000000 70.14533 32.3% - 0s 0 0 69.71866 0 183 53.00000 69.71866 31.5% - 0s 0 0 69.33234 0 183 53.00000 69.33234 30.8% - 0s 0 0 69.14712 0 181 53.00000 69.14712 30.5% - 0s 0 0 68.82849 0 178 53.00000 68.82849 29.9% - 0s 0 0 68.58502 0 180 53.00000 68.58502 29.4% - 0s 0 0 68.46005 0 183 53.00000 68.46005 29.2% - 0s 0 0 68.28054 0 183 53.00000 68.28054 28.8% - 0s 0 0 68.21544 0 182 53.00000 68.21544 28.7% - 0s 0 0 68.05247 0 182 53.00000 68.05247 28.4% - 0s 0 0 67.97467 0 181 53.00000 67.97467 28.3% - 0s 0 0 67.86230 0 181 53.00000 67.86230 28.0% - 0s 0 0 67.83811 0 181 53.00000 67.83811 28.0% - 0s 0 0 67.83811 0 180 53.00000 67.83811 28.0% - 0s 0 2 67.83767 0 180 53.00000 67.83767 28.0% - 0s H 13 13 56.0000000 67.65865 20.8% 107 0s * 27 22 19 57.0000000 67.65865 18.7% 62.0 0s * 43 32 12 58.0000000 67.65722 16.7% 66.2 0s H 113 45 60.0000000 66.95781 11.6% 58.2 0s 610 198 63.22059 11 183 60.00000 65.33560 8.89% 55.8 5s 2378 654 62.94706 24 150 60.00000 63.91740 6.53% 47.8 10s 5194 687 61.80000 30 121 60.00000 62.44828 4.08% 40.4 15s Cutting planes: Gomory: 3 Zero half: 79 Explored 6865 nodes (259669 simplex iterations) in 17.14 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.000000000000e+01, best bound 6.000000000000e+01, gap 0.0%