Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:19 2012 Optimize a model with 513 rows, 139 columns and 1026 nonzeros Presolve removed 158 rows and 8 columns Presolve time: 0.00s Presolved: 355 rows, 131 columns, 781 nonzeros Variable types: 0 continuous, 131 integer (131 binary) Found heuristic solution: objective 44.0000000 Root relaxation: objective 5.650000e+01, 212 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 56.50000 0 95 44.00000 56.50000 28.4% - 0s 0 0 55.62500 0 124 44.00000 55.62500 26.4% - 0s H 0 0 48.0000000 55.62500 15.9% - 0s 0 0 55.03448 0 122 48.00000 55.03448 14.7% - 0s 0 0 54.54710 0 127 48.00000 54.54710 13.6% - 0s 0 0 54.20000 0 123 48.00000 54.20000 12.9% - 0s 0 0 54.11321 0 123 48.00000 54.11321 12.7% - 0s 0 0 54.04217 0 125 48.00000 54.04217 12.6% - 0s 0 0 54.00000 0 122 48.00000 54.00000 12.5% - 0s 0 0 53.88000 0 126 48.00000 53.88000 12.3% - 0s 0 0 53.68800 0 123 48.00000 53.68800 11.9% - 0s 0 0 53.64362 0 126 48.00000 53.64362 11.8% - 0s 0 0 53.61495 0 127 48.00000 53.61495 11.7% - 0s 0 0 53.56566 0 129 48.00000 53.56566 11.6% - 0s H 0 0 49.0000000 53.56566 9.32% - 0s 0 0 53.53469 0 129 49.00000 53.53469 9.25% - 0s 0 0 53.52747 0 128 49.00000 53.52747 9.24% - 0s 0 0 53.50548 0 130 49.00000 53.50548 9.19% - 0s 0 0 53.50548 0 130 49.00000 53.50548 9.19% - 0s H 0 0 51.0000000 53.50548 4.91% - 0s 0 2 53.49011 0 130 51.00000 53.49011 4.88% - 0s Cutting planes: Gomory: 1 Zero half: 80 Explored 33 nodes (2116 simplex iterations) in 0.14 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%