Gurobi 5.0.1 (linux64) logging started Fri Nov 16 01:06:18 2012 Optimize a model with 441 rows, 182 columns and 1441 nonzeros Presolve removed 197 rows and 2 columns Presolve time: 0.01s Presolved: 244 rows, 180 columns, 1000 nonzeros Variable types: 0 continuous, 180 integer (180 binary) Found heuristic solution: objective 13.0000000 Root relaxation: objective 3.000000e+00, 299 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 3.00000 0 18 13.00000 3.00000 76.9% - 0s H 0 0 12.0000000 3.00000 75.0% - 0s H 0 0 8.0000000 3.00000 62.5% - 0s H 0 0 4.0000000 3.00000 25.0% - 0s 0 0 3.00000 0 39 4.00000 3.00000 25.0% - 0s 0 0 infeasible 0 4.00000 3.00001 25.0% - 0s Cutting planes: Zero half: 8 Explored 0 nodes (461 simplex iterations) in 0.02 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%