Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:57 2012 Optimize a model with 407 rows, 89 columns and 814 nonzeros Presolve removed 134 rows and 0 columns Presolve time: 0.00s Presolved: 273 rows, 89 columns, 650 nonzeros Variable types: 0 continuous, 89 integer (89 binary) Found heuristic solution: objective 23.0000000 Root relaxation: objective 3.281894e+01, 197 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 32.81894 0 89 23.00000 32.81894 42.7% - 0s 0 0 32.21137 0 86 23.00000 32.21137 40.0% - 0s H 0 0 24.0000000 32.21137 34.2% - 0s 0 0 32.02509 0 88 24.00000 32.02509 33.4% - 0s 0 0 31.65101 0 85 24.00000 31.65101 31.9% - 0s H 0 0 25.0000000 31.65101 26.6% - 0s 0 0 31.57879 0 88 25.00000 31.57879 26.3% - 0s 0 0 31.45062 0 89 25.00000 31.45062 25.8% - 0s 0 0 31.32492 0 88 25.00000 31.32492 25.3% - 0s 0 0 31.16123 0 86 25.00000 31.16123 24.6% - 0s H 0 0 26.0000000 31.16123 19.9% - 0s 0 0 31.09263 0 89 26.00000 31.09263 19.6% - 0s 0 0 31.05623 0 89 26.00000 31.05623 19.4% - 0s 0 0 30.99999 0 89 26.00000 30.99999 19.2% - 0s 0 0 30.99468 0 88 26.00000 30.99468 19.2% - 0s 0 0 30.99254 0 89 26.00000 30.99254 19.2% - 0s 0 0 30.99254 0 89 26.00000 30.99254 19.2% - 0s 0 2 30.98746 0 89 26.00000 30.98746 19.2% - 0s * 46 21 12 27.0000000 30.54688 13.1% 22.7 0s * 178 3 12 28.0000000 28.17778 0.63% 22.2 0s Cutting planes: Clique: 2 Zero half: 49 Explored 179 nodes (4707 simplex iterations) in 0.20 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.800000000000e+01, best bound 2.800000000000e+01, gap 0.0%