Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:56 2012 Optimize a model with 573 rows, 148 columns and 1146 nonzeros Presolve removed 134 rows and 2 columns Presolve time: 0.00s Presolved: 439 rows, 146 columns, 961 nonzeros Variable types: 0 continuous, 146 integer (146 binary) Found heuristic solution: objective 49.0000000 Root relaxation: objective 6.050000e+01, 237 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.50000 0 115 49.00000 60.50000 23.5% - 0s 0 0 59.50000 0 125 49.00000 59.50000 21.4% - 0s 0 0 58.68444 0 143 49.00000 58.68444 19.8% - 0s 0 0 57.96447 0 143 49.00000 57.96447 18.3% - 0s 0 0 57.65682 0 143 49.00000 57.65682 17.7% - 0s 0 0 57.32143 0 139 49.00000 57.32143 17.0% - 0s 0 0 57.08776 0 144 49.00000 57.08776 16.5% - 0s H 0 0 50.0000000 57.08776 14.2% - 0s 0 0 56.83004 0 141 50.00000 56.83004 13.7% - 0s 0 0 56.67505 0 142 50.00000 56.67505 13.4% - 0s 0 0 56.62805 0 143 50.00000 56.62805 13.3% - 0s 0 0 56.57513 0 142 50.00000 56.57513 13.2% - 0s 0 0 56.46430 0 145 50.00000 56.46430 12.9% - 0s 0 0 56.45651 0 145 50.00000 56.45651 12.9% - 0s 0 0 56.45651 0 142 50.00000 56.45651 12.9% - 0s H 0 0 51.0000000 56.45651 10.7% - 0s 0 2 56.45425 0 142 51.00000 56.45425 10.7% - 0s H 272 47 52.0000000 54.69111 5.18% 37.0 0s Cutting planes: Gomory: 1 Clique: 1 Zero half: 144 Explored 447 nodes (16828 simplex iterations) in 0.67 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%