Gurobi 5.0.1 (linux64) logging started Mon Feb 4 16:00:46 2013 Optimize a model with 41 rows, 36 columns and 126 nonzeros Presolve removed 18 rows and 18 columns Presolve time: 0.00s Presolved: 23 rows, 18 columns, 78 nonzeros Variable types: 3 continuous, 15 integer (15 binary) Found heuristic solution: objective 534.0000000 Found heuristic solution: objective 507.0000000 Root relaxation: objective 4.420370e+02, 3 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 442.03704 0 3 507.00000 442.03704 12.8% - 0s H 0 0 454.0000000 442.03704 2.64% - 0s 0 0 447.00000 0 10 454.00000 447.00000 1.54% - 0s 0 0 451.00000 0 3 454.00000 451.00000 0.66% - 0s H 0 0 451.0000000 451.00000 0.0% - 0s Cutting planes: Cover: 1 MIR: 1 Explored 0 nodes (18 simplex iterations) in 0.00 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.510000000000e+02, best bound 4.510000000000e+02, gap 0.0%