Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:12 2012 Optimize a model with 449 rows, 138 columns and 898 nonzeros Presolve removed 62 rows and 0 columns Presolve time: 0.00s Presolved: 387 rows, 138 columns, 812 nonzeros Variable types: 0 continuous, 138 integer (138 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 6.100000e+01, 184 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 61.00000 0 120 48.00000 61.00000 27.1% - 0s 0 0 58.71429 0 134 48.00000 58.71429 22.3% - 0s 0 0 58.00638 0 137 48.00000 58.00638 20.8% - 0s 0 0 57.21839 0 136 48.00000 57.21839 19.2% - 0s 0 0 56.57373 0 136 48.00000 56.57373 17.9% - 0s H 0 0 49.0000000 56.57373 15.5% - 0s 0 0 56.08412 0 138 49.00000 56.08412 14.5% - 0s 0 0 55.93699 0 138 49.00000 55.93699 14.2% - 0s 0 0 55.64388 0 137 49.00000 55.64388 13.6% - 0s 0 0 55.52614 0 137 49.00000 55.52614 13.3% - 0s 0 0 55.47162 0 138 49.00000 55.47162 13.2% - 0s 0 0 55.47162 0 137 49.00000 55.47162 13.2% - 0s 0 2 55.46984 0 137 49.00000 55.46984 13.2% - 0s H 2 2 52.0000000 55.46984 6.67% 20.0 0s * 30 4 3 53.0000000 55.29555 4.33% 46.9 0s Cutting planes: Gomory: 1 Zero half: 92 Explored 46 nodes (3086 simplex iterations) in 0.16 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%