Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:34 2012 Optimize a model with 444 rows, 127 columns and 888 nonzeros Presolve removed 80 rows and 1 columns Presolve time: 0.00s Presolved: 364 rows, 126 columns, 775 nonzeros Variable types: 0 continuous, 126 integer (126 binary) Found heuristic solution: objective 41.0000000 Root relaxation: objective 5.475000e+01, 222 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 54.75000 0 111 41.00000 54.75000 33.5% - 0s 0 0 53.50000 0 103 41.00000 53.50000 30.5% - 0s H 0 0 42.0000000 53.50000 27.4% - 0s 0 0 53.00000 0 121 42.00000 53.00000 26.2% - 0s 0 0 52.41877 0 126 42.00000 52.41877 24.8% - 0s 0 0 51.93750 0 123 42.00000 51.93750 23.7% - 0s 0 0 51.36842 0 126 42.00000 51.36842 22.3% - 0s 0 0 50.75934 0 125 42.00000 50.75934 20.9% - 0s 0 0 50.43162 0 125 42.00000 50.43162 20.1% - 0s 0 0 50.23657 0 125 42.00000 50.23657 19.6% - 0s 0 0 50.18533 0 126 42.00000 50.18533 19.5% - 0s 0 0 50.18533 0 125 42.00000 50.18533 19.5% - 0s 0 2 50.18466 0 125 42.00000 50.18466 19.5% - 0s H 8 8 44.0000000 50.11081 13.9% 48.5 0s * 15 11 8 46.0000000 50.11081 8.94% 35.7 0s Cutting planes: Zero half: 128 Explored 186 nodes (7212 simplex iterations) in 0.29 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%