Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:56:24 2012 Optimize a model with 753 rows, 122 columns and 1506 nonzeros Presolve removed 285 rows and 0 columns Presolve time: 0.00s Presolved: 468 rows, 122 columns, 1202 nonzeros Variable types: 0 continuous, 122 integer (122 binary) Found heuristic solution: objective 29.0000000 Root relaxation: objective 4.124854e+01, 368 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 41.24854 0 122 29.00000 41.24854 42.2% - 0s H 0 0 31.0000000 41.24854 33.1% - 0s 0 0 40.82278 0 121 31.00000 40.82278 31.7% - 0s 0 0 40.69208 0 120 31.00000 40.69208 31.3% - 0s 0 0 40.61538 0 121 31.00000 40.61538 31.0% - 0s 0 0 40.49407 0 118 31.00000 40.49407 30.6% - 0s 0 0 40.42425 0 122 31.00000 40.42425 30.4% - 0s 0 0 40.33870 0 122 31.00000 40.33870 30.1% - 0s 0 0 40.32281 0 120 31.00000 40.32281 30.1% - 0s 0 0 40.28263 0 120 31.00000 40.28263 29.9% - 0s 0 0 40.23603 0 120 31.00000 40.23603 29.8% - 0s 0 0 40.20374 0 122 31.00000 40.20374 29.7% - 0s 0 0 40.16347 0 122 31.00000 40.16347 29.6% - 0s 0 0 40.06873 0 121 31.00000 40.06873 29.3% - 0s 0 0 40.03790 0 121 31.00000 40.03790 29.2% - 0s 0 0 39.96877 0 119 31.00000 39.96877 28.9% - 0s 0 0 39.92285 0 120 31.00000 39.92285 28.8% - 0s 0 0 39.88155 0 122 31.00000 39.88155 28.7% - 0s H 0 0 32.0000000 39.88155 24.6% - 0s 0 0 39.87729 0 122 32.00000 39.87729 24.6% - 0s 0 0 39.87729 0 121 32.00000 39.87729 24.6% - 0s H 0 0 34.0000000 39.87729 17.3% - 0s 0 2 39.87382 0 121 34.00000 39.87382 17.3% - 0s Cutting planes: Clique: 6 Zero half: 61 Explored 638 nodes (21548 simplex iterations) in 0.95 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.400000000000e+01, best bound 3.400000000000e+01, gap 0.0%