Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:22:03 2012 Optimize a model with 4073 rows, 1806 columns and 13816 nonzeros Presolve removed 674 rows and 2 columns Presolve time: 0.11s Presolved: 3399 rows, 1804 columns, 12100 nonzeros Variable types: 0 continuous, 1804 integer (1804 binary) Found heuristic solution: objective 42.0000000 Root relaxation: objective 3.000000e+00, 2693 iterations, 0.16 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 285 42.00000 3.00000 92.9% - 0s H 0 0 16.0000000 3.00000 81.2% - 0s H 0 0 9.0000000 3.00000 66.7% - 0s 0 0 3.00000 0 264 9.00000 3.00000 66.7% - 1s H 0 0 4.0000000 3.00000 25.0% - 1s 0 0 3.00000 0 1245 4.00000 3.00000 25.0% - 1s 0 0 infeasible 0 4.00000 3.00001 25.0% - 1s Cutting planes: Gomory: 1 Zero half: 33 Explored 0 nodes (8415 simplex iterations) in 1.49 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%