Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:54 2012 Optimize a model with 556 rows, 148 columns and 1112 nonzeros Presolve removed 98 rows and 0 columns Presolve time: 0.00s Presolved: 458 rows, 148 columns, 980 nonzeros Variable types: 0 continuous, 148 integer (148 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 6.325000e+01, 215 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 63.25000 0 124 46.00000 63.25000 37.5% - 0s H 0 0 48.0000000 63.25000 31.8% - 0s 0 0 60.65854 0 139 48.00000 60.65854 26.4% - 0s H 0 0 49.0000000 60.65854 23.8% - 0s 0 0 59.61364 0 143 49.00000 59.61364 21.7% - 0s 0 0 59.33333 0 142 49.00000 59.33333 21.1% - 0s 0 0 58.60000 0 142 49.00000 58.60000 19.6% - 0s 0 0 58.36929 0 143 49.00000 58.36929 19.1% - 0s 0 0 58.24206 0 144 49.00000 58.24206 18.9% - 0s 0 0 58.10360 0 144 49.00000 58.10360 18.6% - 0s H 0 0 50.0000000 58.10360 16.2% - 0s 0 0 57.95877 0 147 50.00000 57.95877 15.9% - 0s 0 0 57.85814 0 146 50.00000 57.85814 15.7% - 0s 0 0 57.83594 0 143 50.00000 57.83594 15.7% - 0s 0 0 57.73782 0 146 50.00000 57.73782 15.5% - 0s 0 0 57.67020 0 147 50.00000 57.67020 15.3% - 0s 0 0 57.67020 0 143 50.00000 57.67020 15.3% - 0s H 0 0 53.0000000 57.67020 8.81% - 0s 0 2 57.66856 0 143 53.00000 57.66856 8.81% - 0s Cutting planes: Gomory: 2 Zero half: 144 Explored 293 nodes (12369 simplex iterations) in 0.52 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%