Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:08 2012 Optimize a model with 255 rows, 97 columns and 510 nonzeros Presolve removed 63 rows and 8 columns Presolve time: 0.00s Presolved: 192 rows, 89 columns, 407 nonzeros Variable types: 0 continuous, 89 integer (89 binary) Found heuristic solution: objective 38.0000000 Root relaxation: objective 4.311111e+01, 135 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 43.11111 0 89 38.00000 43.11111 13.5% - 0s 0 0 42.16000 0 89 38.00000 42.16000 10.9% - 0s 0 0 41.73077 0 89 38.00000 41.73077 9.82% - 0s 0 0 41.50000 0 89 38.00000 41.50000 9.21% - 0s H 0 0 39.0000000 41.50000 6.41% - 0s 0 0 41.32353 0 89 39.00000 41.32353 5.96% - 0s 0 0 41.22260 0 89 39.00000 41.22260 5.70% - 0s 0 0 41.13043 0 89 39.00000 41.13043 5.46% - 0s 0 0 41.05461 0 89 39.00000 41.05461 5.27% - 0s 0 0 41.05405 0 89 39.00000 41.05405 5.27% - 0s 0 0 41.05405 0 89 39.00000 41.05405 5.27% - 0s H 0 0 40.0000000 41.05405 2.64% - 0s 0 0 infeasible 0 40.00000 40.00000 0.0% - 0s Cutting planes: Zero half: 36 Explored 1 nodes (405 simplex iterations) in 0.04 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+01, best bound 4.000000000000e+01, gap 0.0%