Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:02 2012 Optimize a model with 398 rows, 92 columns and 796 nonzeros Presolve removed 115 rows and 0 columns Presolve time: 0.00s Presolved: 283 rows, 92 columns, 655 nonzeros Variable types: 0 continuous, 92 integer (92 binary) Found heuristic solution: objective 25.0000000 Root relaxation: objective 3.587500e+01, 162 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 35.87500 0 83 25.00000 35.87500 43.5% - 0s H 0 0 28.0000000 35.87500 28.1% - 0s 0 0 34.66667 0 89 28.00000 34.66667 23.8% - 0s 0 0 34.40244 0 90 28.00000 34.40244 22.9% - 0s 0 0 33.92308 0 91 28.00000 33.92308 21.2% - 0s 0 0 33.75449 0 91 28.00000 33.75449 20.6% - 0s 0 0 33.44599 0 90 28.00000 33.44599 19.4% - 0s 0 0 33.36111 0 89 28.00000 33.36111 19.1% - 0s 0 0 33.30769 0 89 28.00000 33.30769 19.0% - 0s 0 0 33.26136 0 88 28.00000 33.26136 18.8% - 0s H 0 0 29.0000000 33.26136 14.7% - 0s 0 0 33.23457 0 91 29.00000 33.23457 14.6% - 0s 0 0 33.23457 0 86 29.00000 33.23457 14.6% - 0s 0 2 33.23457 0 86 29.00000 33.23457 14.6% - 0s * 19 7 4 30.0000000 33.12676 10.4% 27.6 0s Cutting planes: Gomory: 1 Zero half: 45 Explored 81 nodes (2614 simplex iterations) in 0.12 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.000000000000e+01, best bound 3.000000000000e+01, gap 0.0%