Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:13:20 2012 Optimize a model with 3191 rows, 1482 columns and 10866 nonzeros Presolve removed 724 rows and 2 columns Presolve time: 0.10s Presolved: 2505 rows, 1480 columns, 10584 nonzeros Variable types: 0 continuous, 1480 integer (1480 binary) Found heuristic solution: objective 38.0000000 Root relaxation: objective 3.000000e+00, 2300 iterations, 0.17 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 42 38.00000 3.00000 92.1% - 0s H 0 0 10.0000000 3.00000 70.0% - 0s H 0 0 5.0000000 3.00000 40.0% - 0s 0 0 3.00000 0 52 5.00000 3.00000 40.0% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 95 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 89 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 87 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 101 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 56 4.00000 3.00000 25.0% - 2s 0 0 3.00000 0 63 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 69 4.00000 3.00000 25.0% - 3s 0 0 3.00000 0 69 4.00000 3.00000 25.0% - 4s 0 2 3.00000 0 69 4.00000 3.00000 25.0% - 5s Cutting planes: Gomory: 13 Zero half: 66 Explored 8 nodes (75403 simplex iterations) in 9.46 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%