Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:54 2012 Optimize a model with 552 rows, 143 columns and 1104 nonzeros Presolve removed 111 rows and 0 columns Presolve time: 0.00s Presolved: 441 rows, 143 columns, 959 nonzeros Variable types: 0 continuous, 143 integer (143 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 5.950000e+01, 248 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 0 117 46.00000 59.50000 29.3% - 0s 0 0 58.30000 0 135 46.00000 58.30000 26.7% - 0s 0 0 57.65000 0 135 46.00000 57.65000 25.3% - 0s 0 0 56.73991 0 142 46.00000 56.73991 23.3% - 0s H 0 0 48.0000000 56.73991 18.2% - 0s 0 0 56.48089 0 142 48.00000 56.48089 17.7% - 0s H 0 0 49.0000000 56.48089 15.3% - 0s 0 0 56.17679 0 142 49.00000 56.17679 14.6% - 0s 0 0 55.87692 0 138 49.00000 55.87692 14.0% - 0s 0 0 55.77397 0 139 49.00000 55.77397 13.8% - 0s 0 0 55.74900 0 140 49.00000 55.74900 13.8% - 0s 0 0 55.66667 0 138 49.00000 55.66667 13.6% - 0s 0 0 55.62371 0 142 49.00000 55.62371 13.5% - 0s 0 0 55.49362 0 142 49.00000 55.49362 13.3% - 0s 0 0 55.35378 0 141 49.00000 55.35378 13.0% - 0s 0 0 55.30415 0 141 49.00000 55.30415 12.9% - 0s 0 0 55.28319 0 142 49.00000 55.28319 12.8% - 0s 0 0 55.28319 0 140 49.00000 55.28319 12.8% - 0s H 0 0 51.0000000 55.28319 8.40% - 0s 0 2 55.28319 0 140 51.00000 55.28319 8.40% - 0s Cutting planes: Zero half: 141 Explored 215 nodes (9215 simplex iterations) in 0.42 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%