Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:05 2012 Optimize a model with 431 rows, 136 columns and 862 nonzeros Presolve removed 83 rows and 6 columns Presolve time: 0.00s Presolved: 348 rows, 130 columns, 730 nonzeros Variable types: 0 continuous, 130 integer (130 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 5.950000e+01, 188 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 59.50000 0 99 46.00000 59.50000 29.3% - 0s H 0 0 48.0000000 59.50000 24.0% - 0s 0 0 58.50000 0 99 48.00000 58.50000 21.9% - 0s 0 0 58.25000 0 127 48.00000 58.25000 21.4% - 0s H 0 0 50.0000000 58.25000 16.5% - 0s 0 0 57.88660 0 128 50.00000 57.88660 15.8% - 0s 0 0 56.92308 0 127 50.00000 56.92308 13.8% - 0s 0 0 56.52830 0 126 50.00000 56.52830 13.1% - 0s 0 0 56.23871 0 127 50.00000 56.23871 12.5% - 0s 0 0 56.08606 0 127 50.00000 56.08606 12.2% - 0s 0 0 56.00665 0 128 50.00000 56.00665 12.0% - 0s 0 0 55.87916 0 127 50.00000 55.87916 11.8% - 0s 0 0 55.83587 0 128 50.00000 55.83587 11.7% - 0s 0 0 55.83587 0 127 50.00000 55.83587 11.7% - 0s H 0 0 52.0000000 55.83587 7.38% - 0s 0 2 55.83359 0 127 52.00000 55.83359 7.37% - 0s H 163 0 53.0000000 53.50000 0.94% 30.9 0s Cutting planes: Zero half: 108 Explored 163 nodes (5970 simplex iterations) in 0.24 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%