Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:49 2012 Optimize a model with 288 rows, 79 columns and 576 nonzeros Presolve removed 82 rows and 2 columns Presolve time: 0.00s Presolved: 206 rows, 77 columns, 465 nonzeros Variable types: 0 continuous, 77 integer (77 binary) Found heuristic solution: objective 25.0000000 Root relaxation: objective 3.250000e+01, 128 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 32.50000 0 57 25.00000 32.50000 30.0% - 0s 0 0 32.00000 0 58 25.00000 32.00000 28.0% - 0s 0 0 31.71795 0 75 25.00000 31.71795 26.9% - 0s H 0 0 26.0000000 31.71795 22.0% - 0s 0 0 31.19178 0 76 26.00000 31.19178 20.0% - 0s H 0 0 27.0000000 31.19178 15.5% - 0s 0 0 30.80000 0 75 27.00000 30.80000 14.1% - 0s 0 0 30.70115 0 74 27.00000 30.70115 13.7% - 0s 0 0 30.62500 0 73 27.00000 30.62500 13.4% - 0s 0 0 30.55856 0 74 27.00000 30.55856 13.2% - 0s 0 0 30.45038 0 73 27.00000 30.45038 12.8% - 0s 0 0 30.37049 0 75 27.00000 30.37049 12.5% - 0s 0 0 30.30197 0 76 27.00000 30.30197 12.2% - 0s 0 0 30.26934 0 74 27.00000 30.26934 12.1% - 0s 0 0 30.21404 0 76 27.00000 30.21404 11.9% - 0s 0 0 30.20661 0 76 27.00000 30.20661 11.9% - 0s 0 0 30.20661 0 76 27.00000 30.20661 11.9% - 0s 0 2 30.19601 0 76 27.00000 30.19601 11.8% - 0s * 4 4 3 28.0000000 30.19301 7.83% 36.8 0s Cutting planes: Zero half: 51 Explored 23 nodes (1162 simplex iterations) in 0.07 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%