Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:30 2012 Optimize a model with 371 rows, 125 columns and 742 nonzeros Presolve removed 71 rows and 2 columns Presolve time: 0.00s Presolved: 300 rows, 123 columns, 644 nonzeros Variable types: 0 continuous, 123 integer (123 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 5.500000e+01, 200 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 55.00000 0 92 47.00000 55.00000 17.0% - 0s 0 0 53.60000 0 117 47.00000 53.60000 14.0% - 0s H 0 0 48.0000000 53.60000 11.7% - 0s 0 0 53.26316 0 122 48.00000 53.26316 11.0% - 0s 0 0 52.85714 0 118 48.00000 52.85714 10.1% - 0s H 0 0 49.0000000 52.85714 7.87% - 0s 0 0 52.50794 0 115 49.00000 52.50794 7.16% - 0s 0 0 52.28030 0 118 49.00000 52.28030 6.69% - 0s 0 0 51.82836 0 118 49.00000 51.82836 5.77% - 0s 0 0 51.75000 0 117 49.00000 51.75000 5.61% - 0s H 0 0 50.0000000 51.75000 3.50% - 0s 0 0 51.68922 0 115 50.00000 51.68922 3.38% - 0s 0 0 51.55357 0 118 50.00000 51.55357 3.11% - 0s 0 0 51.49624 0 116 50.00000 51.49624 2.99% - 0s 0 0 51.49537 0 117 50.00000 51.49537 2.99% - 0s 0 0 51.49537 0 114 50.00000 51.49537 2.99% - 0s H 0 0 51.0000000 51.49537 0.97% - 0s Cutting planes: Gomory: 1 Zero half: 39 Explored 0 nodes (864 simplex iterations) in 0.06 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%