Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:41 2012 Optimize a model with 405 rows, 131 columns and 810 nonzeros Presolve removed 83 rows and 8 columns Presolve time: 0.00s Presolved: 322 rows, 123 columns, 674 nonzeros Variable types: 0 continuous, 123 integer (123 binary) Found heuristic solution: objective 43.0000000 Root relaxation: objective 5.800000e+01, 162 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 58.00000 0 98 43.00000 58.00000 34.9% - 0s H 0 0 45.0000000 58.00000 28.9% - 0s 0 0 56.50000 0 97 45.00000 56.50000 25.6% - 0s 0 0 56.25000 0 106 45.00000 56.25000 25.0% - 0s 0 0 55.52000 0 113 45.00000 55.52000 23.4% - 0s H 0 0 46.0000000 55.52000 20.7% - 0s 0 0 54.80214 0 114 46.00000 54.80214 19.1% - 0s H 0 0 48.0000000 54.80214 14.2% - 0s 0 0 54.50000 0 112 48.00000 54.50000 13.5% - 0s 0 0 54.34146 0 114 48.00000 54.34146 13.2% - 0s H 0 0 50.0000000 54.34146 8.68% - 0s 0 0 54.12500 0 118 50.00000 54.12500 8.25% - 0s 0 0 53.91852 0 119 50.00000 53.91852 7.84% - 0s 0 0 53.91176 0 119 50.00000 53.91176 7.82% - 0s 0 0 53.91176 0 118 50.00000 53.91176 7.82% - 0s 0 2 53.89960 0 118 50.00000 53.89960 7.80% - 0s * 14 6 8 51.0000000 53.89960 5.69% 24.1 0s Cutting planes: Gomory: 2 Zero half: 89 Explored 60 nodes (2156 simplex iterations) in 0.11 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%