Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:54 2012 Optimize a model with 396 rows, 85 columns and 792 nonzeros Presolve removed 153 rows and 0 columns Presolve time: 0.00s Presolved: 243 rows, 85 columns, 611 nonzeros Variable types: 0 continuous, 85 integer (85 binary) Found heuristic solution: objective 23.0000000 Root relaxation: objective 3.051852e+01, 180 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 30.51852 0 82 23.00000 30.51852 32.7% - 0s H 0 0 24.0000000 30.51852 27.2% - 0s 0 0 30.00000 0 80 24.00000 30.00000 25.0% - 0s 0 0 29.85714 0 83 24.00000 29.85714 24.4% - 0s 0 0 29.75000 0 82 24.00000 29.75000 24.0% - 0s H 0 0 25.0000000 29.75000 19.0% - 0s 0 0 29.68954 0 84 25.00000 29.68954 18.8% - 0s 0 0 29.61455 0 83 25.00000 29.61455 18.5% - 0s 0 0 29.51541 0 82 25.00000 29.51541 18.1% - 0s H 0 0 26.0000000 29.51541 13.5% - 0s 0 0 29.48726 0 83 26.00000 29.48726 13.4% - 0s 0 0 29.43640 0 84 26.00000 29.43640 13.2% - 0s 0 0 29.40848 0 84 26.00000 29.40848 13.1% - 0s 0 0 29.39850 0 84 26.00000 29.39850 13.1% - 0s 0 0 29.39850 0 84 26.00000 29.39850 13.1% - 0s 0 2 29.39850 0 84 26.00000 29.39850 13.1% - 0s * 28 2 4 27.0000000 29.09195 7.75% 24.7 0s Cutting planes: Clique: 2 Zero half: 34 Explored 47 nodes (1745 simplex iterations) in 0.10 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.700000000000e+01, best bound 2.700000000000e+01, gap 0.0%