Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:35 2012 Optimize a model with 442 rows, 128 columns and 884 nonzeros Presolve removed 90 rows and 0 columns Presolve time: 0.00s Presolved: 352 rows, 128 columns, 764 nonzeros Variable types: 0 continuous, 128 integer (128 binary) Found heuristic solution: objective 41.0000000 Root relaxation: objective 5.366667e+01, 235 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 53.66667 0 115 41.00000 53.66667 30.9% - 0s H 0 0 45.0000000 53.66667 19.3% - 0s 0 0 52.50000 0 121 45.00000 52.50000 16.7% - 0s 0 0 52.13107 0 120 45.00000 52.13107 15.8% - 0s 0 0 51.62319 0 120 45.00000 51.62319 14.7% - 0s 0 0 51.28041 0 124 45.00000 51.28041 14.0% - 0s H 0 0 46.0000000 51.28041 11.5% - 0s 0 0 51.22625 0 124 46.00000 51.22625 11.4% - 0s 0 0 51.20637 0 123 46.00000 51.20637 11.3% - 0s H 0 0 47.0000000 51.20637 8.95% - 0s 0 0 51.10619 0 123 47.00000 51.10619 8.74% - 0s 0 0 50.98325 0 123 47.00000 50.98325 8.47% - 0s 0 0 50.92932 0 122 47.00000 50.92932 8.36% - 0s 0 0 50.87934 0 124 47.00000 50.87934 8.25% - 0s 0 0 50.87132 0 123 47.00000 50.87132 8.24% - 0s 0 0 50.81871 0 124 47.00000 50.81871 8.12% - 0s 0 0 50.68183 0 123 47.00000 50.68183 7.83% - 0s 0 0 50.58007 0 127 47.00000 50.58007 7.62% - 0s H 0 0 48.0000000 50.58007 5.38% - 0s 0 0 50.53152 0 125 48.00000 50.53152 5.27% - 0s 0 0 50.52281 0 125 48.00000 50.52281 5.26% - 0s 0 0 50.52281 0 125 48.00000 50.52281 5.26% - 0s 0 2 50.52250 0 125 48.00000 50.52250 5.26% - 0s Cutting planes: Gomory: 1 Zero half: 61 Explored 29 nodes (1913 simplex iterations) in 0.14 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.800000000000e+01, best bound 4.800000000000e+01, gap 0.0%