Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:42 2012 Optimize a model with 462 rows, 132 columns and 924 nonzeros Presolve removed 83 rows and 0 columns Presolve time: 0.00s Presolved: 379 rows, 132 columns, 809 nonzeros Variable types: 0 continuous, 132 integer (132 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 5.700000e+01, 185 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 57.00000 0 114 47.00000 57.00000 21.3% - 0s 0 0 54.92857 0 127 47.00000 54.92857 16.9% - 0s 0 0 53.88889 0 128 47.00000 53.88889 14.7% - 0s 0 0 53.27273 0 124 47.00000 53.27273 13.3% - 0s 0 0 52.95833 0 128 47.00000 52.95833 12.7% - 0s H 0 0 48.0000000 52.95833 10.3% - 0s 0 0 52.49624 0 129 48.00000 52.49624 9.37% - 0s 0 0 52.30759 0 125 48.00000 52.30759 8.97% - 0s 0 0 52.13103 0 127 48.00000 52.13103 8.61% - 0s 0 0 51.94485 0 128 48.00000 51.94485 8.22% - 0s 0 0 51.84983 0 129 48.00000 51.84983 8.02% - 0s H 0 0 49.0000000 51.84983 5.82% - 0s 0 0 51.81740 0 130 49.00000 51.81740 5.75% - 0s 0 0 51.81740 0 125 49.00000 51.81740 5.75% - 0s 0 2 51.81177 0 125 49.00000 51.81177 5.74% - 0s Cutting planes: Gomory: 2 Zero half: 86 Explored 37 nodes (2533 simplex iterations) in 0.13 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.900000000000e+01, best bound 4.900000000000e+01, gap 0.0%