Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:49 2012 Optimize a model with 324 rows, 80 columns and 648 nonzeros Presolve removed 100 rows and 0 columns Presolve time: 0.00s Presolved: 224 rows, 80 columns, 529 nonzeros Variable types: 0 continuous, 80 integer (80 binary) Found heuristic solution: objective 25.0000000 Root relaxation: objective 3.142857e+01, 142 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 31.42857 0 78 25.00000 31.42857 25.7% - 0s H 0 0 26.0000000 31.42857 20.9% - 0s 0 0 30.85918 0 76 26.00000 30.85918 18.7% - 0s 0 0 30.49296 0 78 26.00000 30.49296 17.3% - 0s 0 0 30.28446 0 79 26.00000 30.28446 16.5% - 0s 0 0 30.15493 0 72 26.00000 30.15493 16.0% - 0s 0 0 30.12908 0 79 26.00000 30.12908 15.9% - 0s 0 0 30.06743 0 78 26.00000 30.06743 15.6% - 0s 0 0 30.02887 0 79 26.00000 30.02887 15.5% - 0s H 0 0 27.0000000 30.02887 11.2% - 0s 0 0 29.98614 0 78 27.00000 29.98614 11.1% - 0s 0 0 29.95000 0 76 27.00000 29.95000 10.9% - 0s 0 0 29.93949 0 79 27.00000 29.93949 10.9% - 0s 0 0 29.93949 0 78 27.00000 29.93949 10.9% - 0s 0 2 29.93883 0 78 27.00000 29.93883 10.9% - 0s * 4 4 3 28.0000000 29.93883 6.92% 27.8 0s Cutting planes: Zero half: 27 Explored 17 nodes (728 simplex iterations) in 0.06 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%