Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:14 2012 Optimize a model with 516 rows, 145 columns and 1032 nonzeros Presolve removed 110 rows and 6 columns Presolve time: 0.00s Presolved: 406 rows, 139 columns, 864 nonzeros Variable types: 0 continuous, 139 integer (139 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 6.150000e+01, 204 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 61.50000 0 117 48.00000 61.50000 28.1% - 0s 0 0 60.25000 0 123 48.00000 60.25000 25.5% - 0s 0 0 59.24000 0 138 48.00000 59.24000 23.4% - 0s H 0 0 49.0000000 59.24000 20.9% - 0s 0 0 58.00000 0 137 49.00000 58.00000 18.4% - 0s H 0 0 50.0000000 58.00000 16.0% - 0s 0 0 57.89136 0 138 50.00000 57.89136 15.8% - 0s 0 0 57.50993 0 137 50.00000 57.50993 15.0% - 0s 0 0 57.29683 0 137 50.00000 57.29683 14.6% - 0s 0 0 56.99715 0 136 50.00000 56.99715 14.0% - 0s 0 0 56.83996 0 137 50.00000 56.83996 13.7% - 0s 0 0 56.74074 0 135 50.00000 56.74074 13.5% - 0s 0 0 56.64583 0 139 50.00000 56.64583 13.3% - 0s 0 0 56.53311 0 138 50.00000 56.53311 13.1% - 0s 0 0 56.49635 0 138 50.00000 56.49635 13.0% - 0s 0 0 56.49635 0 137 50.00000 56.49635 13.0% - 0s 0 2 56.49525 0 137 50.00000 56.49525 13.0% - 0s * 31 17 9 51.0000000 56.39271 10.6% 37.4 0s * 126 28 6 52.0000000 55.08143 5.93% 34.9 0s Cutting planes: Zero half: 134 Explored 308 nodes (10642 simplex iterations) in 0.43 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%