Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:42:21 2012 Optimize a model with 672 rows, 159 columns and 1344 nonzeros Presolve removed 141 rows and 3 columns Presolve time: 0.00s Presolved: 531 rows, 156 columns, 1147 nonzeros Variable types: 0 continuous, 156 integer (156 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 6.700000e+01, 222 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 67.00000 0 128 48.00000 67.00000 39.6% - 0s 0 0 64.75000 0 138 48.00000 64.75000 34.9% - 0s 0 0 63.86364 0 156 48.00000 63.86364 33.0% - 0s 0 0 63.27868 0 154 48.00000 63.27868 31.8% - 0s 0 0 62.49491 0 156 48.00000 62.49491 30.2% - 0s H 0 0 49.0000000 62.49491 27.5% - 0s 0 0 62.15875 0 156 49.00000 62.15875 26.9% - 0s 0 0 61.65894 0 154 49.00000 61.65894 25.8% - 0s 0 0 61.30341 0 155 49.00000 61.30341 25.1% - 0s H 0 0 50.0000000 61.30341 22.6% - 0s 0 0 61.17557 0 155 50.00000 61.17557 22.4% - 0s 0 0 61.06167 0 156 50.00000 61.06167 22.1% - 0s 0 0 61.02592 0 156 50.00000 61.02592 22.1% - 0s 0 0 61.02592 0 156 50.00000 61.02592 22.1% - 0s 0 2 61.02579 0 156 50.00000 61.02579 22.1% - 0s * 37 25 26 51.0000000 61.02413 19.7% 42.0 0s * 241 118 11 52.0000000 59.04839 13.6% 41.0 0s * 1143 312 31 53.0000000 57.81896 9.09% 41.0 4s 1193 328 55.72222 19 125 53.00000 57.81818 9.09% 40.9 5s Cutting planes: Gomory: 3 Zero half: 69 Explored 4396 nodes (126365 simplex iterations) in 8.47 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%