Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:01 2012 Optimize a model with 402 rows, 92 columns and 804 nonzeros Presolve removed 140 rows and 0 columns Presolve time: 0.00s Presolved: 262 rows, 92 columns, 630 nonzeros Variable types: 0 continuous, 92 integer (92 binary) Found heuristic solution: objective 26.0000000 Root relaxation: objective 3.436889e+01, 170 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 34.36889 0 88 26.00000 34.36889 32.2% - 0s 0 0 33.85173 0 86 26.00000 33.85173 30.2% - 0s H 0 0 28.0000000 33.85173 20.9% - 0s 0 0 33.53110 0 87 28.00000 33.53110 19.8% - 0s H 0 0 29.0000000 33.53110 15.6% - 0s 0 0 33.41722 0 87 29.00000 33.41722 15.2% - 0s 0 0 33.29915 0 89 29.00000 33.29915 14.8% - 0s H 0 0 30.0000000 33.29915 11.0% - 0s 0 0 32.97281 0 88 30.00000 32.97281 9.91% - 0s 0 0 32.92132 0 88 30.00000 32.92132 9.74% - 0s 0 0 32.83984 0 91 30.00000 32.83984 9.47% - 0s H 0 0 31.0000000 32.83984 5.93% - 0s 0 0 32.81172 0 90 31.00000 32.81172 5.84% - 0s 0 0 32.78529 0 90 31.00000 32.78529 5.76% - 0s 0 0 32.77238 0 91 31.00000 32.77238 5.72% - 0s 0 0 32.77238 0 91 31.00000 32.77238 5.72% - 0s 0 2 32.77238 0 91 31.00000 32.77238 5.72% - 0s Cutting planes: Gomory: 1 Clique: 1 Zero half: 43 Explored 23 nodes (1251 simplex iterations) in 0.09 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%