Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:36:16 2012 Optimize a model with 839 rows, 181 columns and 1678 nonzeros Presolve removed 208 rows and 2 columns Presolve time: 0.00s Presolved: 631 rows, 179 columns, 1402 nonzeros Variable types: 0 continuous, 179 integer (179 binary) Found heuristic solution: objective 54.0000000 Root relaxation: objective 7.262500e+01, 363 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 72.62500 0 154 54.00000 72.62500 34.5% - 0s 0 0 71.25172 0 170 54.00000 71.25172 31.9% - 0s H 0 0 55.0000000 71.25172 29.5% - 0s 0 0 70.14469 0 176 55.00000 70.14469 27.5% - 0s 0 0 69.66583 0 176 55.00000 69.66583 26.7% - 0s 0 0 69.24187 0 178 55.00000 69.24187 25.9% - 0s 0 0 68.99848 0 178 55.00000 68.99848 25.5% - 0s 0 0 68.72529 0 178 55.00000 68.72529 25.0% - 0s 0 0 68.34847 0 174 55.00000 68.34847 24.3% - 0s 0 0 68.22267 0 173 55.00000 68.22267 24.0% - 0s 0 0 68.13651 0 175 55.00000 68.13651 23.9% - 0s 0 0 68.03336 0 176 55.00000 68.03336 23.7% - 0s H 0 0 57.0000000 68.03336 19.4% - 0s 0 0 67.99148 0 176 57.00000 67.99148 19.3% - 0s 0 0 67.80146 0 178 57.00000 67.80146 18.9% - 0s 0 0 67.77157 0 177 57.00000 67.77157 18.9% - 0s 0 0 67.74822 0 177 57.00000 67.74822 18.9% - 0s 0 0 67.74822 0 176 57.00000 67.74822 18.9% - 0s 0 2 67.74648 0 176 57.00000 67.74648 18.9% - 0s H 18 18 59.0000000 67.74259 14.8% 62.6 0s 613 240 64.53231 14 177 59.00000 64.87838 10.0% 46.8 5s H 1847 511 60.0000000 64.18012 6.97% 44.2 7s 2776 655 61.00000 25 104 60.00000 63.26374 5.44% 40.2 10s * 3052 374 31 61.0000000 63.10345 3.45% 39.2 10s Cutting planes: Gomory: 6 Zero half: 72 Explored 3665 nodes (135928 simplex iterations) in 11.15 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.100000000000e+01, best bound 6.100000000000e+01, gap 0.0%