Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:44 2012 Optimize a model with 223 rows, 70 columns and 446 nonzeros Presolve removed 64 rows and 2 columns Presolve time: 0.00s Presolved: 159 rows, 68 columns, 356 nonzeros Variable types: 0 continuous, 68 integer (68 binary) Found heuristic solution: objective 23.0000000 Root relaxation: objective 2.850000e+01, 108 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 28.50000 0 49 23.00000 28.50000 23.9% - 0s 0 0 28.00000 0 57 23.00000 28.00000 21.7% - 0s H 0 0 25.0000000 28.00000 12.0% - 0s 0 0 27.75000 0 62 25.00000 27.75000 11.0% - 0s 0 0 27.50000 0 65 25.00000 27.50000 10.0% - 0s 0 0 27.30000 0 64 25.00000 27.30000 9.20% - 0s H 0 0 26.0000000 27.30000 5.00% - 0s 0 0 27.12500 0 64 26.00000 27.12500 4.33% - 0s 0 0 cutoff 0 26.00000 26.99997 3.85% - 0s Cutting planes: Zero half: 49 Explored 0 nodes (320 simplex iterations) in 0.02 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.600000000000e+01, best bound 2.600000000000e+01, gap 0.0%