Gurobi 5.0.1 (linux64) logging started Fri Nov 16 11:57:15 2012 Optimize a model with 18814 rows, 5112 columns and 61200 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.66s Presolved: 18812 rows, 5110 columns, 60670 nonzeros Variable types: 0 continuous, 5110 integer (5110 binary) Found heuristic solution: objective 71.0000000 Root relaxation: objective 2.000000e+00, 3740 iterations, 0.15 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 142 71.00000 2.00000 97.2% - 1s H 0 0 61.0000000 2.00000 96.7% - 1s H 0 0 6.0000000 2.00000 66.7% - 1s 0 0 3.00000 0 3668 6.00000 3.00000 50.0% - 17s 0 0 3.00000 0 3616 6.00000 3.00000 50.0% - 21s 0 0 3.00730 0 3699 6.00000 3.00730 49.9% - 23s H 0 0 4.0000000 3.00730 24.8% - 23s Cutting planes: Gomory: 1 Clique: 51 Zero half: 3 Explored 0 nodes (52652 simplex iterations) in 23.37 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%