Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:28 2012 Optimize a model with 487 rows, 141 columns and 974 nonzeros Presolve removed 100 rows and 4 columns Presolve time: 0.00s Presolved: 387 rows, 137 columns, 833 nonzeros Variable types: 0 continuous, 137 integer (137 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 5.960000e+01, 262 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 59.60000 0 119 46.00000 59.60000 29.6% - 0s H 0 0 52.0000000 59.60000 14.6% - 0s 0 0 58.25000 0 135 52.00000 58.25000 12.0% - 0s 0 0 57.62500 0 136 52.00000 57.62500 10.8% - 0s H 0 0 53.0000000 57.62500 8.73% - 0s 0 0 57.42282 0 134 53.00000 57.42282 8.34% - 0s 0 0 57.09407 0 133 53.00000 57.09407 7.72% - 0s 0 0 56.89140 0 136 53.00000 56.89140 7.34% - 0s 0 0 56.67641 0 135 53.00000 56.67641 6.94% - 0s 0 0 56.51121 0 136 53.00000 56.51121 6.62% - 0s 0 0 56.42869 0 136 53.00000 56.42869 6.47% - 0s 0 0 56.30166 0 136 53.00000 56.30166 6.23% - 0s 0 0 56.28916 0 134 53.00000 56.28916 6.21% - 0s 0 0 56.07317 0 134 53.00000 56.07317 5.80% - 0s 0 0 55.98609 0 132 53.00000 55.98609 5.63% - 0s 0 0 55.93793 0 133 53.00000 55.93793 5.54% - 0s 0 0 55.88639 0 132 53.00000 55.88639 5.45% - 0s 0 0 55.84599 0 136 53.00000 55.84599 5.37% - 0s 0 0 55.84599 0 133 53.00000 55.84599 5.37% - 0s 0 2 55.84452 0 133 53.00000 55.84452 5.37% - 0s H 5 5 54.0000000 55.72028 3.19% 51.4 0s Cutting planes: Zero half: 66 Explored 22 nodes (1786 simplex iterations) in 0.14 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.400000000000e+01, best bound 5.400000000000e+01, gap 0.0%