Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:07 2012 Optimize a model with 471 rows, 137 columns and 942 nonzeros Presolve removed 104 rows and 4 columns Presolve time: 0.00s Presolved: 367 rows, 133 columns, 794 nonzeros Variable types: 0 continuous, 133 integer (133 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 5.850000e+01, 253 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 58.50000 0 109 45.00000 58.50000 30.0% - 0s 0 0 57.82128 0 131 45.00000 57.82128 28.5% - 0s H 0 0 48.0000000 57.82128 20.5% - 0s 0 0 57.21429 0 129 48.00000 57.21429 19.2% - 0s H 0 0 49.0000000 57.21429 16.8% - 0s 0 0 56.61390 0 131 49.00000 56.61390 15.5% - 0s 0 0 56.10504 0 130 49.00000 56.10504 14.5% - 0s 0 0 55.66130 0 130 49.00000 55.66130 13.6% - 0s 0 0 55.50638 0 129 49.00000 55.50638 13.3% - 0s 0 0 55.36111 0 130 49.00000 55.36111 13.0% - 0s H 0 0 50.0000000 55.36111 10.7% - 0s 0 0 55.17239 0 130 50.00000 55.17239 10.3% - 0s 0 0 55.08072 0 129 50.00000 55.08072 10.2% - 0s 0 0 55.06709 0 131 50.00000 55.06709 10.1% - 0s 0 0 55.06709 0 131 50.00000 55.06709 10.1% - 0s 0 2 55.06247 0 130 50.00000 55.06247 10.1% - 0s * 456 0 8 51.0000000 51.00000 0.0% 25.0 0s Cutting planes: Zero half: 101 Explored 457 nodes (12297 simplex iterations) in 0.46 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%