Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:06 2012 Optimize a model with 438 rows, 95 columns and 876 nonzeros Presolve removed 137 rows and 0 columns Presolve time: 0.00s Presolved: 301 rows, 95 columns, 707 nonzeros Variable types: 0 continuous, 95 integer (95 binary) Found heuristic solution: objective 26.0000000 Root relaxation: objective 3.471429e+01, 187 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 34.71429 0 88 26.00000 34.71429 33.5% - 0s H 0 0 28.0000000 34.71429 24.0% - 0s 0 0 34.11874 0 91 28.00000 34.11874 21.9% - 0s 0 0 33.89535 0 92 28.00000 33.89535 21.1% - 0s H 0 0 29.0000000 33.89535 16.9% - 0s H 0 0 30.0000000 33.89535 13.0% - 0s 0 0 33.79012 0 91 30.00000 33.79012 12.6% - 0s 0 0 33.74222 0 90 30.00000 33.74222 12.5% - 0s 0 0 33.64771 0 92 30.00000 33.64771 12.2% - 0s H 0 0 31.0000000 33.64771 8.54% - 0s 0 0 33.56313 0 93 31.00000 33.56313 8.27% - 0s 0 0 33.42433 0 92 31.00000 33.42433 7.82% - 0s 0 0 33.30540 0 92 31.00000 33.30540 7.44% - 0s 0 0 33.26443 0 92 31.00000 33.26443 7.30% - 0s 0 0 33.23042 0 91 31.00000 33.23042 7.19% - 0s 0 0 33.22348 0 92 31.00000 33.22348 7.17% - 0s 0 0 33.22348 0 92 31.00000 33.22348 7.17% - 0s 0 2 33.21737 0 92 31.00000 33.21737 7.15% - 0s Cutting planes: Clique: 1 Zero half: 46 Explored 20 nodes (1263 simplex iterations) in 0.10 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%