Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:11 2012 Optimize a model with 449 rows, 97 columns and 898 nonzeros Presolve removed 142 rows and 0 columns Presolve time: 0.00s Presolved: 307 rows, 97 columns, 725 nonzeros Variable types: 0 continuous, 97 integer (97 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 3.622917e+01, 193 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 36.22917 0 95 27.00000 36.22917 34.2% - 0s H 0 0 30.0000000 36.22917 20.8% - 0s 0 0 35.40000 0 95 30.00000 35.40000 18.0% - 0s 0 0 35.32883 0 96 30.00000 35.32883 17.8% - 0s 0 0 35.25816 0 94 30.00000 35.25816 17.5% - 0s 0 0 34.93847 0 94 30.00000 34.93847 16.5% - 0s 0 0 34.79632 0 96 30.00000 34.79632 16.0% - 0s 0 0 34.59404 0 94 30.00000 34.59404 15.3% - 0s H 0 0 31.0000000 34.59404 11.6% - 0s 0 0 34.51784 0 94 31.00000 34.51784 11.3% - 0s 0 0 34.44851 0 95 31.00000 34.44851 11.1% - 0s 0 0 34.33528 0 95 31.00000 34.33528 10.8% - 0s 0 0 34.26169 0 95 31.00000 34.26169 10.5% - 0s 0 0 34.20903 0 94 31.00000 34.20903 10.4% - 0s 0 0 34.13222 0 94 31.00000 34.13222 10.1% - 0s 0 0 34.10390 0 95 31.00000 34.10390 10.0% - 0s 0 0 34.06177 0 96 31.00000 34.06177 9.88% - 0s 0 0 34.05544 0 96 31.00000 34.05544 9.86% - 0s 0 0 34.05544 0 94 31.00000 34.05544 9.86% - 0s 0 2 34.05338 0 94 31.00000 34.05338 9.85% - 0s Cutting planes: Zero half: 67 Explored 57 nodes (2608 simplex iterations) in 0.15 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%