Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:36:50 2012 Optimize a model with 613 rows, 151 columns and 1226 nonzeros Presolve removed 112 rows and 0 columns Presolve time: 0.00s Presolved: 501 rows, 151 columns, 1076 nonzeros Variable types: 0 continuous, 151 integer (151 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.300000e+01, 260 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 63.00000 0 124 47.00000 63.00000 34.0% - 0s 0 0 62.16571 0 150 47.00000 62.16571 32.3% - 0s H 0 0 51.0000000 62.16571 21.9% - 0s 0 0 61.14165 0 149 51.00000 61.14165 19.9% - 0s H 0 0 52.0000000 61.14165 17.6% - 0s 0 0 60.41860 0 149 52.00000 60.41860 16.2% - 0s 0 0 59.87462 0 149 52.00000 59.87462 15.1% - 0s 0 0 59.17282 0 149 52.00000 59.17282 13.8% - 0s 0 0 58.88800 0 151 52.00000 58.88800 13.2% - 0s 0 0 58.76559 0 149 52.00000 58.76559 13.0% - 0s 0 0 58.69477 0 148 52.00000 58.69477 12.9% - 0s 0 0 58.63306 0 149 52.00000 58.63306 12.8% - 0s 0 0 58.54188 0 150 52.00000 58.54188 12.6% - 0s 0 0 58.46883 0 151 52.00000 58.46883 12.4% - 0s 0 0 58.36870 0 150 52.00000 58.36870 12.2% - 0s 0 0 58.21863 0 149 52.00000 58.21863 12.0% - 0s 0 0 58.12862 0 150 52.00000 58.12862 11.8% - 0s 0 0 58.11647 0 149 52.00000 58.11647 11.8% - 0s 0 0 58.11333 0 149 52.00000 58.11333 11.8% - 0s 0 0 58.11333 0 149 52.00000 58.11333 11.8% - 0s 0 2 58.10796 0 149 52.00000 58.10796 11.7% - 0s Cutting planes: Zero half: 172 Explored 873 nodes (35183 simplex iterations) in 1.47 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%