Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:09 2012 Optimize a model with 503 rows, 144 columns and 1006 nonzeros Presolve removed 98 rows and 0 columns Presolve time: 0.00s Presolved: 405 rows, 144 columns, 873 nonzeros Variable types: 0 continuous, 144 integer (144 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 6.000000e+01, 243 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.00000 0 114 46.00000 60.00000 30.4% - 0s H 0 0 49.0000000 60.00000 22.4% - 0s 0 0 59.06996 0 142 49.00000 59.06996 20.6% - 0s 0 0 58.43511 0 139 49.00000 58.43511 19.3% - 0s 0 0 57.91698 0 143 49.00000 57.91698 18.2% - 0s 0 0 57.52425 0 140 49.00000 57.52425 17.4% - 0s 0 0 57.16758 0 143 49.00000 57.16758 16.7% - 0s 0 0 56.94857 0 143 49.00000 56.94857 16.2% - 0s 0 0 56.71834 0 139 49.00000 56.71834 15.8% - 0s 0 0 56.48640 0 144 49.00000 56.48640 15.3% - 0s 0 0 56.40857 0 143 49.00000 56.40857 15.1% - 0s H 0 0 50.0000000 56.40857 12.8% - 0s 0 0 56.33139 0 143 50.00000 56.33139 12.7% - 0s 0 0 56.30779 0 143 50.00000 56.30779 12.6% - 0s 0 0 56.30779 0 142 50.00000 56.30779 12.6% - 0s 0 2 56.30517 0 141 50.00000 56.30517 12.6% - 0s H 13 11 52.0000000 56.30435 8.28% 40.2 0s * 115 19 17 53.0000000 55.09354 3.95% 33.9 0s Cutting planes: Clique: 1 Zero half: 94 Explored 158 nodes (6009 simplex iterations) in 0.27 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%