Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:54 2012 Optimize a model with 381 rows, 86 columns and 762 nonzeros Presolve removed 114 rows and 0 columns Presolve time: 0.00s Presolved: 267 rows, 86 columns, 638 nonzeros Variable types: 0 continuous, 86 integer (86 binary) Found heuristic solution: objective 24.0000000 Root relaxation: objective 3.227941e+01, 173 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 32.27941 0 84 24.00000 32.27941 34.5% - 0s H 0 0 25.0000000 32.27941 29.1% - 0s 0 0 31.83333 0 83 25.00000 31.83333 27.3% - 0s H 0 0 26.0000000 31.83333 22.4% - 0s 0 0 31.68242 0 84 26.00000 31.68242 21.9% - 0s 0 0 31.52604 0 85 26.00000 31.52604 21.3% - 0s 0 0 31.26115 0 86 26.00000 31.26115 20.2% - 0s 0 0 31.12162 0 86 26.00000 31.12162 19.7% - 0s H 0 0 28.0000000 31.12162 11.1% - 0s 0 0 30.97500 0 83 28.00000 30.97500 10.6% - 0s 0 0 30.87666 0 85 28.00000 30.87666 10.3% - 0s 0 0 30.78463 0 86 28.00000 30.78463 9.95% - 0s 0 0 30.74718 0 86 28.00000 30.74718 9.81% - 0s 0 0 30.72841 0 86 28.00000 30.72841 9.74% - 0s 0 0 30.63723 0 86 28.00000 30.63723 9.42% - 0s 0 0 30.63158 0 86 28.00000 30.63158 9.40% - 0s 0 0 30.63158 0 86 28.00000 30.63158 9.40% - 0s 0 2 30.63097 0 86 28.00000 30.63097 9.40% - 0s Cutting planes: Gomory: 1 Clique: 1 Zero half: 40 Explored 34 nodes (1557 simplex iterations) in 0.10 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.800000000000e+01, best bound 2.800000000000e+01, gap 0.0%