Gurobi 5.0.1 (linux64) logging started Fri Nov 16 07:03:37 2012 Optimize a model with 11159 rows, 3660 columns and 36838 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.29s Presolved: 11157 rows, 3658 columns, 36466 nonzeros Variable types: 0 continuous, 3658 integer (3658 binary) Found heuristic solution: objective 60.0000000 Root relaxation: objective 2.000000e+00, 2657 iterations, 0.08 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 120 60.00000 2.00000 96.7% - 0s H 0 0 56.0000000 2.00000 96.4% - 0s H 0 0 5.0000000 2.00000 60.0% - 0s H 0 0 4.0000000 2.00000 50.0% - 0s 0 0 3.00000 0 1741 4.00000 3.00000 25.0% - 1s 0 0 infeasible 0 4.00000 3.00001 25.0% - 1s Cutting planes: Clique: 31 Zero half: 8 Explored 0 nodes (13667 simplex iterations) in 1.82 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%