Gurobi 5.0.1 (linux64) logging started Fri Nov 16 03:23:49 2012 Optimize a model with 4073 rows, 1806 columns and 13816 nonzeros Presolve removed 674 rows and 2 columns Presolve time: 0.11s Presolved: 3441 rows, 1804 columns, 13864 nonzeros Variable types: 0 continuous, 1804 integer (1804 binary) Found heuristic solution: objective 42.0000000 Root relaxation: objective 3.000000e+00, 2861 iterations, 0.22 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 50 42.00000 3.00000 92.9% - 0s H 0 0 37.0000000 3.00000 91.9% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 70 4.00000 3.00000 25.0% - 1s 0 0 3.00000 0 52 4.00000 3.00000 25.0% - 1s 0 0 infeasible 0 4.00000 3.00001 25.0% - 1s Cutting planes: Gomory: 1 Zero half: 7 Explored 0 nodes (16639 simplex iterations) in 1.76 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%