Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:13 2012 Optimize a model with 480 rows, 138 columns and 960 nonzeros Presolve removed 91 rows and 0 columns Presolve time: 0.00s Presolved: 389 rows, 138 columns, 837 nonzeros Variable types: 0 continuous, 138 integer (138 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 5.775000e+01, 259 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 57.75000 0 123 46.00000 57.75000 25.5% - 0s 0 0 56.89474 0 133 46.00000 56.89474 23.7% - 0s H 0 0 47.0000000 56.89474 21.1% - 0s 0 0 56.42857 0 136 47.00000 56.42857 20.1% - 0s H 0 0 48.0000000 56.42857 17.6% - 0s 0 0 56.24561 0 135 48.00000 56.24561 17.2% - 0s 0 0 56.01231 0 135 48.00000 56.01231 16.7% - 0s 0 0 55.65582 0 136 48.00000 55.65582 15.9% - 0s 0 0 55.32553 0 136 48.00000 55.32553 15.3% - 0s 0 0 55.12759 0 136 48.00000 55.12759 14.8% - 0s 0 0 55.09414 0 136 48.00000 55.09414 14.8% - 0s 0 0 54.99910 0 136 48.00000 54.99910 14.6% - 0s 0 0 54.91482 0 137 48.00000 54.91482 14.4% - 0s 0 0 54.81153 0 135 48.00000 54.81153 14.2% - 0s 0 0 54.74899 0 135 48.00000 54.74899 14.1% - 0s 0 0 54.63777 0 136 48.00000 54.63777 13.8% - 0s 0 0 54.60190 0 136 48.00000 54.60190 13.8% - 0s 0 0 54.60190 0 135 48.00000 54.60190 13.8% - 0s H 0 0 50.0000000 54.60190 9.20% - 0s 0 2 54.60064 0 134 50.00000 54.60064 9.20% - 0s Cutting planes: Gomory: 2 Zero half: 101 Explored 361 nodes (11544 simplex iterations) in 0.46 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%