Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:06 2012 Optimize a model with 434 rows, 95 columns and 868 nonzeros Presolve removed 151 rows and 2 columns Presolve time: 0.00s Presolved: 283 rows, 93 columns, 683 nonzeros Variable types: 0 continuous, 93 integer (93 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 3.550000e+01, 179 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 35.50000 0 83 27.00000 35.50000 31.5% - 0s 0 0 34.73077 0 92 27.00000 34.73077 28.6% - 0s H 0 0 28.0000000 34.73077 24.0% - 0s H 0 0 29.0000000 34.73077 19.8% - 0s 0 0 34.44444 0 91 29.00000 34.44444 18.8% - 0s H 0 0 30.0000000 34.44444 14.8% - 0s 0 0 34.19221 0 91 30.00000 34.19221 14.0% - 0s 0 0 33.87234 0 88 30.00000 33.87234 12.9% - 0s 0 0 33.75000 0 90 30.00000 33.75000 12.5% - 0s 0 0 33.63946 0 91 30.00000 33.63946 12.1% - 0s H 0 0 31.0000000 33.63946 8.51% - 0s 0 0 33.60475 0 90 31.00000 33.60475 8.40% - 0s 0 0 33.52093 0 90 31.00000 33.52093 8.13% - 0s 0 0 33.44000 0 91 31.00000 33.44000 7.87% - 0s 0 0 33.42625 0 92 31.00000 33.42625 7.83% - 0s 0 0 33.42625 0 92 31.00000 33.42625 7.83% - 0s 0 2 33.42586 0 92 31.00000 33.42586 7.83% - 0s Cutting planes: Clique: 1 Zero half: 63 Explored 37 nodes (1994 simplex iterations) in 0.11 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%