Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:57:49 2012 Optimize a model with 843 rows, 123 columns and 1686 nonzeros Presolve removed 336 rows and 0 columns Presolve time: 0.01s Presolved: 507 rows, 123 columns, 1335 nonzeros Variable types: 0 continuous, 123 integer (123 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 4.024574e+01, 351 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 40.24574 0 123 28.00000 40.24574 43.7% - 0s 0 0 39.74819 0 122 28.00000 39.74819 42.0% - 0s 0 0 39.49055 0 123 28.00000 39.49055 41.0% - 0s 0 0 39.39177 0 122 28.00000 39.39177 40.7% - 0s 0 0 39.25694 0 122 28.00000 39.25694 40.2% - 0s 0 0 39.14900 0 122 28.00000 39.14900 39.8% - 0s 0 0 39.07770 0 121 28.00000 39.07770 39.6% - 0s 0 0 38.98318 0 123 28.00000 38.98318 39.2% - 0s H 0 0 30.0000000 38.98318 29.9% - 0s 0 0 38.93771 0 122 30.00000 38.93771 29.8% - 0s 0 0 38.90043 0 122 30.00000 38.90043 29.7% - 0s 0 0 38.82716 0 122 30.00000 38.82716 29.4% - 0s 0 0 38.79477 0 122 30.00000 38.79477 29.3% - 0s 0 0 38.76547 0 122 30.00000 38.76547 29.2% - 0s 0 0 38.71831 0 122 30.00000 38.71831 29.1% - 0s 0 0 38.67547 0 122 30.00000 38.67547 28.9% - 0s 0 0 38.58428 0 123 30.00000 38.58428 28.6% - 0s 0 0 38.53860 0 123 30.00000 38.53860 28.5% - 0s 0 0 38.49438 0 121 30.00000 38.49438 28.3% - 0s 0 0 38.46278 0 121 30.00000 38.46278 28.2% - 0s 0 0 38.35963 0 121 30.00000 38.35963 27.9% - 0s 0 0 38.32497 0 120 30.00000 38.32497 27.7% - 0s 0 0 38.31757 0 122 30.00000 38.31757 27.7% - 0s 0 2 38.30659 0 122 30.00000 38.30659 27.7% - 0s * 320 106 8 31.0000000 36.22175 16.8% 35.9 0s 613 185 34.62500 8 122 31.00000 35.41379 14.2% 33.8 5s 625 193 32.25000 14 123 31.00000 35.41379 14.2% 33.2 10s Cutting planes: Gomory: 1 Clique: 3 Zero half: 58 Explored 2692 nodes (81634 simplex iterations) in 13.45 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%