Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:56 2012 Optimize a model with 542 rows, 143 columns and 1084 nonzeros Presolve removed 99 rows and 0 columns Presolve time: 0.00s Presolved: 443 rows, 143 columns, 947 nonzeros Variable types: 0 continuous, 143 integer (143 binary) Found heuristic solution: objective 43.0000000 Root relaxation: objective 6.075000e+01, 250 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.75000 0 121 43.00000 60.75000 41.3% - 0s H 0 0 44.0000000 60.75000 38.1% - 0s 0 0 59.25000 0 133 44.00000 59.25000 34.7% - 0s 0 0 58.46154 0 142 44.00000 58.46154 32.9% - 0s H 0 0 45.0000000 58.46154 29.9% - 0s 0 0 57.08778 0 141 45.00000 57.08778 26.9% - 0s H 0 0 46.0000000 57.08778 24.1% - 0s 0 0 56.57942 0 141 46.00000 56.57942 23.0% - 0s 0 0 55.90670 0 140 46.00000 55.90670 21.5% - 0s 0 0 55.47610 0 140 46.00000 55.47610 20.6% - 0s 0 0 55.06741 0 139 46.00000 55.06741 19.7% - 0s 0 0 54.85104 0 140 46.00000 54.85104 19.2% - 0s 0 0 54.71161 0 139 46.00000 54.71161 18.9% - 0s 0 0 54.58308 0 139 46.00000 54.58308 18.7% - 0s 0 0 54.50318 0 140 46.00000 54.50318 18.5% - 0s H 0 0 47.0000000 54.50318 16.0% - 0s 0 0 54.45052 0 139 47.00000 54.45052 15.9% - 0s 0 0 54.43339 0 140 47.00000 54.43339 15.8% - 0s 0 0 54.43339 0 140 47.00000 54.43339 15.8% - 0s H 0 0 48.0000000 54.43339 13.4% - 0s 0 2 54.43177 0 140 48.00000 54.43177 13.4% - 0s H 30 21 49.0000000 54.07845 10.4% 56.5 0s * 31 19 11 50.0000000 54.07845 8.16% 55.6 0s Cutting planes: Zero half: 159 Explored 292 nodes (13872 simplex iterations) in 0.61 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.000000000000e+01, best bound 5.000000000000e+01, gap 0.0%