Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:25:35 2012 Optimize a model with 826 rows, 178 columns and 1652 nonzeros Presolve removed 190 rows and 0 columns Presolve time: 0.01s Presolved: 636 rows, 178 columns, 1414 nonzeros Variable types: 0 continuous, 178 integer (178 binary) Found heuristic solution: objective 49.0000000 Root relaxation: objective 6.950000e+01, 388 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 69.50000 0 137 49.00000 69.50000 41.8% - 0s H 0 0 51.0000000 69.50000 36.3% - 0s 0 0 68.33566 0 174 51.00000 68.33566 34.0% - 0s 0 0 67.57363 0 175 51.00000 67.57363 32.5% - 0s 0 0 66.48565 0 176 51.00000 66.48565 30.4% - 0s 0 0 66.24695 0 176 51.00000 66.24695 29.9% - 0s 0 0 65.92132 0 173 51.00000 65.92132 29.3% - 0s 0 0 65.72276 0 174 51.00000 65.72276 28.9% - 0s 0 0 65.70044 0 175 51.00000 65.70044 28.8% - 0s 0 0 65.70044 0 173 51.00000 65.70044 28.8% - 0s H 0 0 52.0000000 65.70044 26.3% - 0s 0 2 65.69363 0 173 52.00000 65.69363 26.3% - 0s * 21 21 15 55.0000000 65.52076 19.1% 51.8 0s * 37 22 20 56.0000000 65.52076 17.0% 34.0 0s 612 285 62.30769 6 174 56.00000 62.87595 12.3% 43.4 5s 621 291 61.13953 13 175 56.00000 62.87595 12.3% 42.8 10s 642 307 62.87595 18 168 56.00000 62.87595 12.3% 49.4 15s H 2159 572 57.0000000 60.92105 6.88% 46.6 19s 2433 613 58.31624 22 130 57.00000 60.65385 6.41% 46.1 20s Cutting planes: Gomory: 2 Zero half: 211 Explored 4714 nodes (192872 simplex iterations) in 24.82 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.700000000000e+01, best bound 5.700000000000e+01, gap 0.0%