Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:31 2012 Optimize a model with 410 rows, 126 columns and 820 nonzeros Presolve removed 68 rows and 0 columns Presolve time: 0.00s Presolved: 342 rows, 126 columns, 725 nonzeros Variable types: 0 continuous, 126 integer (126 binary) Found heuristic solution: objective 42.0000000 Root relaxation: objective 5.500000e+01, 204 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 55.00000 0 104 42.00000 55.00000 31.0% - 0s 0 0 53.78788 0 126 42.00000 53.78788 28.1% - 0s H 0 0 46.0000000 53.78788 16.9% - 0s 0 0 52.80000 0 123 46.00000 52.80000 14.8% - 0s 0 0 52.47771 0 125 46.00000 52.47771 14.1% - 0s 0 0 51.97807 0 125 46.00000 51.97807 13.0% - 0s 0 0 51.61227 0 125 46.00000 51.61227 12.2% - 0s 0 0 51.50142 0 124 46.00000 51.50142 12.0% - 0s 0 0 51.40367 0 126 46.00000 51.40367 11.7% - 0s 0 0 51.28279 0 125 46.00000 51.28279 11.5% - 0s 0 0 51.06057 0 125 46.00000 51.06057 11.0% - 0s 0 0 51.03003 0 124 46.00000 51.03003 10.9% - 0s 0 0 50.96868 0 124 46.00000 50.96868 10.8% - 0s 0 0 50.95254 0 124 46.00000 50.95254 10.8% - 0s 0 0 50.95254 0 124 46.00000 50.95254 10.8% - 0s 0 2 50.94301 0 124 46.00000 50.94301 10.7% - 0s * 7 7 6 47.0000000 50.94301 8.39% 54.7 0s Cutting planes: Zero half: 88 Explored 178 nodes (6221 simplex iterations) in 0.26 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.700000000000e+01, best bound 4.700000000000e+01, gap 0.0%