Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:26 2012 Optimize a model with 481 rows, 140 columns and 962 nonzeros Presolve removed 107 rows and 6 columns Presolve time: 0.00s Presolved: 374 rows, 134 columns, 802 nonzeros Variable types: 0 continuous, 134 integer (134 binary) Found heuristic solution: objective 43.0000000 Root relaxation: objective 5.875000e+01, 213 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 58.75000 0 111 43.00000 58.75000 36.6% - 0s 0 0 57.49138 0 132 43.00000 57.49138 33.7% - 0s H 0 0 44.0000000 57.49138 30.7% - 0s 0 0 57.06000 0 131 44.00000 57.06000 29.7% - 0s H 0 0 46.0000000 57.06000 24.0% - 0s H 0 0 48.0000000 57.06000 18.9% - 0s 0 0 56.41594 0 132 48.00000 56.41594 17.5% - 0s 0 0 56.23680 0 131 48.00000 56.23680 17.2% - 0s 0 0 55.84471 0 132 48.00000 55.84471 16.3% - 0s 0 0 55.62120 0 132 48.00000 55.62120 15.9% - 0s 0 0 55.49280 0 133 48.00000 55.49280 15.6% - 0s 0 0 55.43384 0 133 48.00000 55.43384 15.5% - 0s 0 0 55.40793 0 133 48.00000 55.40793 15.4% - 0s 0 0 55.40793 0 133 48.00000 55.40793 15.4% - 0s 0 2 55.39560 0 133 48.00000 55.39560 15.4% - 0s H 40 28 49.0000000 55.29614 12.8% 38.4 0s H 111 28 50.0000000 54.33514 8.67% 32.8 0s Cutting planes: Zero half: 110 Explored 677 nodes (18400 simplex iterations) in 0.64 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%