Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:32 2012 Optimize a model with 436 rows, 126 columns and 872 nonzeros Presolve removed 93 rows and 2 columns Presolve time: 0.00s Presolved: 343 rows, 124 columns, 744 nonzeros Variable types: 0 continuous, 124 integer (124 binary) Found heuristic solution: objective 41.0000000 Root relaxation: objective 5.225000e+01, 236 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 52.25000 0 112 41.00000 52.25000 27.4% - 0s 0 0 51.33333 0 123 41.00000 51.33333 25.2% - 0s H 0 0 42.0000000 51.33333 22.2% - 0s H 0 0 43.0000000 51.33333 19.4% - 0s 0 0 50.82677 0 123 43.00000 50.82677 18.2% - 0s H 0 0 45.0000000 50.82677 12.9% - 0s H 0 0 46.0000000 50.82677 10.5% - 0s 0 0 50.12500 0 118 46.00000 50.12500 8.97% - 0s 0 0 49.96226 0 119 46.00000 49.96226 8.61% - 0s 0 0 49.80589 0 121 46.00000 49.80589 8.27% - 0s 0 0 49.73143 0 122 46.00000 49.73143 8.11% - 0s 0 0 49.66018 0 123 46.00000 49.66018 7.96% - 0s 0 0 49.57841 0 122 46.00000 49.57841 7.78% - 0s 0 0 49.53758 0 121 46.00000 49.53758 7.69% - 0s 0 0 49.50584 0 122 46.00000 49.50584 7.62% - 0s 0 0 49.50584 0 121 46.00000 49.50584 7.62% - 0s 0 2 49.50000 0 121 46.00000 49.50000 7.61% - 0s Cutting planes: Zero half: 78 Explored 88 nodes (3346 simplex iterations) in 0.16 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.600000000000e+01, best bound 4.600000000000e+01, gap 0.0%