Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:46 2012 Optimize a model with 290 rows, 75 columns and 580 nonzeros Presolve removed 104 rows and 2 columns Presolve time: 0.00s Presolved: 186 rows, 73 columns, 441 nonzeros Variable types: 0 continuous, 73 integer (73 binary) Found heuristic solution: objective 20.0000000 Root relaxation: objective 2.866667e+01, 120 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 28.66667 0 67 20.00000 28.66667 43.3% - 0s H 0 0 22.0000000 28.66667 30.3% - 0s 0 0 28.11647 0 73 22.00000 28.11647 27.8% - 0s H 0 0 23.0000000 28.11647 22.2% - 0s 0 0 27.62432 0 73 23.00000 27.62432 20.1% - 0s 0 0 27.34454 0 72 23.00000 27.34454 18.9% - 0s 0 0 27.26923 0 73 23.00000 27.26923 18.6% - 0s 0 0 27.14911 0 71 23.00000 27.14911 18.0% - 0s 0 0 27.06633 0 73 23.00000 27.06633 17.7% - 0s 0 0 26.91772 0 72 23.00000 26.91772 17.0% - 0s 0 0 26.89483 0 73 23.00000 26.89483 16.9% - 0s 0 0 26.89483 0 73 23.00000 26.89483 16.9% - 0s 0 2 26.89329 0 73 23.00000 26.89329 16.9% - 0s * 16 9 6 24.0000000 26.49378 10.4% 22.1 0s * 56 1 8 25.0000000 26.12500 4.50% 17.3 0s Cutting planes: Gomory: 1 Zero half: 33 Explored 58 nodes (1428 simplex iterations) in 0.06 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.500000000000e+01, best bound 2.500000000000e+01, gap 0.0%