Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:17 2012 Optimize a model with 323 rows, 113 columns and 646 nonzeros Presolve removed 67 rows and 11 columns Presolve time: 0.00s Presolved: 256 rows, 102 columns, 526 nonzeros Variable types: 0 continuous, 102 integer (102 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 5.100000e+01, 157 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 51.00000 0 82 45.00000 51.00000 13.3% - 0s 0 0 50.50000 0 89 45.00000 50.50000 12.2% - 0s H 0 0 47.0000000 50.50000 7.45% - 0s 0 0 50.25000 0 100 47.00000 50.25000 6.91% - 0s 0 0 50.00000 0 78 47.00000 50.00000 6.38% - 0s 0 0 49.83333 0 95 47.00000 49.83333 6.03% - 0s 0 0 49.48571 0 101 47.00000 49.48571 5.29% - 0s 0 0 48.92857 0 97 47.00000 48.92857 4.10% - 0s 0 0 48.66234 0 101 47.00000 48.66234 3.54% - 0s 0 0 48.23649 0 102 47.00000 48.23649 2.63% - 0s 0 0 48.20000 0 97 47.00000 48.20000 2.55% - 0s 0 0 48.17143 0 102 47.00000 48.17143 2.49% - 0s 0 0 48.17143 0 102 47.00000 48.17143 2.49% - 0s 0 2 48.15126 0 102 47.00000 48.15126 2.45% - 0s Cutting planes: Zero half: 36 Explored 3 nodes (628 simplex iterations) in 0.05 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.700000000000e+01, best bound 4.700000000000e+01, gap 0.0%