Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:51 2012 Optimize a model with 342 rows, 82 columns and 684 nonzeros Presolve removed 123 rows and 1 columns Presolve time: 0.00s Presolved: 219 rows, 81 columns, 525 nonzeros Variable types: 0 continuous, 81 integer (81 binary) Found heuristic solution: objective 24.0000000 Root relaxation: objective 3.123718e+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 31.23718 0 78 24.00000 31.23718 30.2% - 0s H 0 0 25.0000000 31.23718 24.9% - 0s 0 0 30.31405 0 79 25.00000 30.31405 21.3% - 0s H 0 0 26.0000000 30.31405 16.6% - 0s 0 0 30.12456 0 77 26.00000 30.12456 15.9% - 0s 0 0 29.83707 0 78 26.00000 29.83707 14.8% - 0s 0 0 29.70451 0 78 26.00000 29.70451 14.2% - 0s H 0 0 27.0000000 29.70451 10.0% - 0s 0 0 29.60000 0 75 27.00000 29.60000 9.63% - 0s 0 0 29.46939 0 79 27.00000 29.46939 9.15% - 0s 0 0 29.41368 0 80 27.00000 29.41368 8.94% - 0s 0 0 29.37352 0 79 27.00000 29.37352 8.79% - 0s 0 0 29.36895 0 79 27.00000 29.36895 8.77% - 0s 0 0 29.36895 0 79 27.00000 29.36895 8.77% - 0s 0 2 29.36826 0 79 27.00000 29.36826 8.77% - 0s Cutting planes: Zero half: 36 Explored 35 nodes (1128 simplex iterations) in 0.07 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.700000000000e+01, best bound 2.700000000000e+01, gap 0.0%