Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:37:12 2012 Optimize a model with 576 rows, 152 columns and 1152 nonzeros Presolve removed 120 rows and 0 columns Presolve time: 0.00s Presolved: 456 rows, 152 columns, 986 nonzeros Variable types: 0 continuous, 152 integer (152 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 6.250000e+01, 224 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 62.50000 0 117 51.00000 62.50000 22.5% - 0s 0 0 61.50249 0 148 51.00000 61.50249 20.6% - 0s H 0 0 52.0000000 61.50249 18.3% - 0s 0 0 60.60606 0 146 52.00000 60.60606 16.6% - 0s H 0 0 53.0000000 60.60606 14.4% - 0s 0 0 60.02817 0 149 53.00000 60.02817 13.3% - 0s H 0 0 54.0000000 60.02817 11.2% - 0s 0 0 59.73341 0 150 54.00000 59.73341 10.6% - 0s 0 0 59.58771 0 149 54.00000 59.58771 10.3% - 0s 0 0 59.45134 0 150 54.00000 59.45134 10.1% - 0s 0 0 59.29923 0 150 54.00000 59.29923 9.81% - 0s 0 0 59.13828 0 148 54.00000 59.13828 9.52% - 0s 0 0 59.09978 0 150 54.00000 59.09978 9.44% - 0s 0 0 59.05782 0 150 54.00000 59.05782 9.37% - 0s 0 0 59.00690 0 151 54.00000 59.00690 9.27% - 0s 0 0 58.97118 0 150 54.00000 58.97118 9.21% - 0s 0 0 58.92914 0 150 54.00000 58.92914 9.13% - 0s 0 0 58.89992 0 150 54.00000 58.89992 9.07% - 0s 0 0 58.89992 0 150 54.00000 58.89992 9.07% - 0s 0 2 58.89931 0 150 54.00000 58.89931 9.07% - 0s H 29 15 55.0000000 58.58295 6.51% 47.2 0s Cutting planes: Gomory: 2 Zero half: 122 Explored 151 nodes (7495 simplex iterations) in 0.38 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.500000000000e+01, best bound 5.500000000000e+01, gap 0.0%