Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:47 2012 Optimize a model with 283 rows, 77 columns and 566 nonzeros Presolve removed 84 rows and 0 columns Presolve time: 0.00s Presolved: 199 rows, 77 columns, 461 nonzeros Variable types: 0 continuous, 77 integer (77 binary) Found heuristic solution: objective 23.0000000 Root relaxation: objective 3.033333e+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 30.33333 0 68 23.00000 30.33333 31.9% - 0s H 0 0 26.0000000 30.33333 16.7% - 0s 0 0 29.95000 0 74 26.00000 29.95000 15.2% - 0s 0 0 29.62500 0 70 26.00000 29.62500 13.9% - 0s 0 0 29.36364 0 71 26.00000 29.36364 12.9% - 0s 0 0 29.16667 0 70 26.00000 29.16667 12.2% - 0s 0 0 28.97872 0 73 26.00000 28.97872 11.5% - 0s 0 0 28.83974 0 73 26.00000 28.83974 10.9% - 0s 0 0 28.63542 0 70 26.00000 28.63542 10.1% - 0s 0 0 28.57547 0 72 26.00000 28.57547 9.91% - 0s H 0 0 27.0000000 28.57547 5.84% - 0s 0 0 28.50000 0 39 27.00000 28.50000 5.56% - 0s 0 0 28.44978 0 72 27.00000 28.44978 5.37% - 0s 0 0 28.41489 0 73 27.00000 28.41489 5.24% - 0s 0 0 28.40984 0 73 27.00000 28.40984 5.22% - 0s 0 0 28.40984 0 73 27.00000 28.40984 5.22% - 0s 0 2 28.40984 0 73 27.00000 28.40984 5.22% - 0s Cutting planes: Zero half: 36 Explored 16 nodes (761 simplex iterations) in 0.05 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%