Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:33 2012 Optimize a model with 436 rows, 127 columns and 872 nonzeros Presolve removed 80 rows and 2 columns Presolve time: 0.00s Presolved: 356 rows, 125 columns, 757 nonzeros Variable types: 0 continuous, 125 integer (125 binary) Found heuristic solution: objective 40.0000000 Root relaxation: objective 5.450000e+01, 168 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 54.50000 0 93 40.00000 54.50000 36.2% - 0s H 0 0 45.0000000 54.50000 21.1% - 0s 0 0 53.42857 0 120 45.00000 53.42857 18.7% - 0s H 0 0 46.0000000 53.42857 16.1% - 0s H 0 0 47.0000000 53.42857 13.7% - 0s 0 0 53.09375 0 122 47.00000 53.09375 13.0% - 0s 0 0 52.40000 0 124 47.00000 52.40000 11.5% - 0s 0 0 52.19403 0 122 47.00000 52.19403 11.1% - 0s 0 0 51.93842 0 121 47.00000 51.93842 10.5% - 0s 0 0 51.70492 0 122 47.00000 51.70492 10.0% - 0s 0 0 51.47622 0 121 47.00000 51.47622 9.52% - 0s 0 0 51.40000 0 118 47.00000 51.40000 9.36% - 0s 0 0 51.40000 0 118 47.00000 51.40000 9.36% - 0s 0 0 51.40000 0 116 47.00000 51.40000 9.36% - 0s H 0 0 48.0000000 51.40000 7.08% - 0s 0 2 51.40000 0 116 48.00000 51.40000 7.08% - 0s H 29 3 49.0000000 51.11625 4.32% 29.7 0s Cutting planes: Gomory: 1 Zero half: 73 Explored 41 nodes (2185 simplex iterations) in 0.11 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%