Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:12 2012 Optimize a model with 478 rows, 138 columns and 956 nonzeros Presolve removed 95 rows and 2 columns Presolve time: 0.00s Presolved: 383 rows, 136 columns, 816 nonzeros Variable types: 0 continuous, 136 integer (136 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 5.812500e+01, 256 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 58.12500 0 117 48.00000 58.12500 21.1% - 0s 0 0 57.42857 0 128 48.00000 57.42857 19.6% - 0s 0 0 56.85075 0 134 48.00000 56.85075 18.4% - 0s 0 0 56.41667 0 129 48.00000 56.41667 17.5% - 0s 0 0 56.07801 0 130 48.00000 56.07801 16.8% - 0s 0 0 55.95968 0 133 48.00000 55.95968 16.6% - 0s 0 0 55.85177 0 134 48.00000 55.85177 16.4% - 0s 0 0 55.81650 0 135 48.00000 55.81650 16.3% - 0s H 0 0 49.0000000 55.81650 13.9% - 0s 0 0 55.73250 0 135 49.00000 55.73250 13.7% - 0s 0 0 55.62767 0 134 49.00000 55.62767 13.5% - 0s 0 0 55.57628 0 134 49.00000 55.57628 13.4% - 0s 0 0 55.51685 0 133 49.00000 55.51685 13.3% - 0s 0 0 55.41671 0 135 49.00000 55.41671 13.1% - 0s 0 0 55.33795 0 135 49.00000 55.33795 12.9% - 0s 0 0 55.29358 0 135 49.00000 55.29358 12.8% - 0s 0 0 55.23451 0 134 49.00000 55.23451 12.7% - 0s 0 0 55.16240 0 135 49.00000 55.16240 12.6% - 0s 0 0 55.08566 0 135 49.00000 55.08566 12.4% - 0s 0 0 55.07002 0 135 49.00000 55.07002 12.4% - 0s 0 0 55.07002 0 134 49.00000 55.07002 12.4% - 0s H 0 0 50.0000000 55.07002 10.1% - 0s 0 2 55.07002 0 134 50.00000 55.07002 10.1% - 0s * 150 28 6 51.0000000 53.67829 5.25% 30.4 0s Cutting planes: Gomory: 1 Zero half: 112 Explored 273 nodes (8728 simplex iterations) in 0.38 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.100000000000e+01, best bound 5.100000000000e+01, gap 0.0%