Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:32 2012 Optimize a model with 396 rows, 126 columns and 792 nonzeros Presolve removed 83 rows and 6 columns Presolve time: 0.00s Presolved: 313 rows, 120 columns, 657 nonzeros Variable types: 0 continuous, 120 integer (120 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 5.500000e+01, 173 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 55.00000 0 96 46.00000 55.00000 19.6% - 0s H 0 0 47.0000000 55.00000 17.0% - 0s 0 0 54.50000 0 97 47.00000 54.50000 16.0% - 0s 0 0 53.70000 0 116 47.00000 53.70000 14.3% - 0s 0 0 53.00000 0 109 47.00000 53.00000 12.8% - 0s 0 0 52.33333 0 102 47.00000 52.33333 11.3% - 0s 0 0 52.21622 0 117 47.00000 52.21622 11.1% - 0s 0 0 52.15789 0 114 47.00000 52.15789 11.0% - 0s 0 0 52.04545 0 118 47.00000 52.04545 10.7% - 0s 0 0 51.88889 0 108 47.00000 51.88889 10.4% - 0s 0 0 51.74242 0 117 47.00000 51.74242 10.1% - 0s 0 0 51.47273 0 115 47.00000 51.47273 9.52% - 0s 0 0 51.33333 0 112 47.00000 51.33333 9.22% - 0s 0 0 51.33333 0 112 47.00000 51.33333 9.22% - 0s 0 0 51.33333 0 104 47.00000 51.33333 9.22% - 0s H 0 0 49.0000000 51.33333 4.76% - 0s 0 2 51.33333 0 103 49.00000 51.33333 4.76% - 0s * 20 3 6 50.0000000 51.25000 2.50% 29.6 0s Cutting planes: Gomory: 1 Zero half: 32 Explored 24 nodes (1738 simplex iterations) in 0.09 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.000000000000e+01, best bound 5.000000000000e+01, gap 0.0%