Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:43 2012 Optimize a model with 537 rows, 142 columns and 1074 nonzeros Presolve removed 103 rows and 0 columns Presolve time: 0.00s Presolved: 434 rows, 142 columns, 939 nonzeros Variable types: 0 continuous, 142 integer (142 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 5.900000e+01, 228 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 59.00000 0 104 45.00000 59.00000 31.1% - 0s H 0 0 46.0000000 59.00000 28.3% - 0s 0 0 58.30000 0 130 46.00000 58.30000 26.7% - 0s 0 0 57.39286 0 139 46.00000 57.39286 24.8% - 0s 0 0 56.04557 0 141 46.00000 56.04557 21.8% - 0s 0 0 55.33055 0 141 46.00000 55.33055 20.3% - 0s 0 0 55.16069 0 138 46.00000 55.16069 19.9% - 0s 0 0 55.05246 0 139 46.00000 55.05246 19.7% - 0s 0 0 54.77837 0 141 46.00000 54.77837 19.1% - 0s 0 0 54.68196 0 141 46.00000 54.68196 18.9% - 0s H 0 0 47.0000000 54.68196 16.3% - 0s H 0 0 50.0000000 54.68196 9.36% - 0s 0 0 54.61481 0 138 50.00000 54.61481 9.23% - 0s 0 0 54.52816 0 139 50.00000 54.52816 9.06% - 0s 0 0 54.49176 0 139 50.00000 54.49176 8.98% - 0s 0 0 54.49176 0 139 50.00000 54.49176 8.98% - 0s 0 2 54.49027 0 139 50.00000 54.49027 8.98% - 0s Cutting planes: Gomory: 1 Zero half: 116 Explored 432 nodes (15086 simplex iterations) in 0.58 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.000000000000e+01, best bound 5.000000000000e+01, gap 0.0%