Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:50:32 2012 Optimize a model with 598 rows, 110 columns and 1196 nonzeros Presolve removed 225 rows and 0 columns Presolve time: 0.00s Presolved: 373 rows, 110 columns, 931 nonzeros Variable types: 0 continuous, 110 integer (110 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 3.846154e+01, 260 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 38.46154 0 109 28.00000 38.46154 37.4% - 0s 0 0 38.10758 0 108 28.00000 38.10758 36.1% - 0s 0 0 37.65462 0 110 28.00000 37.65462 34.5% - 0s H 0 0 29.0000000 37.65462 29.8% - 0s 0 0 37.56164 0 109 29.00000 37.56164 29.5% - 0s 0 0 37.41337 0 110 29.00000 37.41337 29.0% - 0s 0 0 37.36484 0 110 29.00000 37.36484 28.8% - 0s 0 0 37.32420 0 110 29.00000 37.32420 28.7% - 0s 0 0 37.26671 0 109 29.00000 37.26671 28.5% - 0s 0 0 37.21135 0 109 29.00000 37.21135 28.3% - 0s 0 0 37.14294 0 109 29.00000 37.14294 28.1% - 0s 0 0 37.12323 0 109 29.00000 37.12323 28.0% - 0s 0 0 37.06058 0 107 29.00000 37.06058 27.8% - 0s H 0 0 30.0000000 37.06058 23.5% - 0s 0 0 37.04846 0 108 30.00000 37.04846 23.5% - 0s 0 0 37.04846 0 108 30.00000 37.04846 23.5% - 0s H 0 0 32.0000000 37.04846 15.8% - 0s 0 2 37.04681 0 108 32.00000 37.04681 15.8% - 0s Cutting planes: Clique: 1 Zero half: 38 Explored 346 nodes (10857 simplex iterations) in 0.46 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.200000000000e+01, best bound 3.200000000000e+01, gap 0.0%