Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:28 2012 Optimize a model with 419 rows, 123 columns and 838 nonzeros Presolve removed 87 rows and 1 columns Presolve time: 0.00s Presolved: 332 rows, 122 columns, 712 nonzeros Variable types: 0 continuous, 122 integer (122 binary) Found heuristic solution: objective 41.0000000 Root relaxation: objective 5.150000e+01, 180 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 51.50000 0 89 41.00000 51.50000 25.6% - 0s H 0 0 42.0000000 51.50000 22.6% - 0s 0 0 50.47761 0 119 42.00000 50.47761 20.2% - 0s H 0 0 43.0000000 50.47761 17.4% - 0s 0 0 49.82222 0 120 43.00000 49.82222 15.9% - 0s H 0 0 44.0000000 49.82222 13.2% - 0s 0 0 49.55241 0 119 44.00000 49.55241 12.6% - 0s 0 0 48.87874 0 121 44.00000 48.87874 11.1% - 0s 0 0 48.75000 0 119 44.00000 48.75000 10.8% - 0s 0 0 48.63457 0 121 44.00000 48.63457 10.5% - 0s 0 0 48.53151 0 121 44.00000 48.53151 10.3% - 0s 0 0 48.41239 0 122 44.00000 48.41239 10.0% - 0s 0 0 48.27007 0 119 44.00000 48.27007 9.70% - 0s 0 0 48.24950 0 122 44.00000 48.24950 9.66% - 0s 0 0 48.24950 0 121 44.00000 48.24950 9.66% - 0s 0 2 48.24299 0 121 44.00000 48.24299 9.64% - 0s H 27 9 45.0000000 47.69014 5.98% 32.0 0s Cutting planes: Gomory: 1 Zero half: 91 Explored 89 nodes (3409 simplex iterations) in 0.17 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.500000000000e+01, best bound 4.500000000000e+01, gap 0.0%