Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:08 2012 Optimize a model with 467 rows, 137 columns and 934 nonzeros Presolve removed 73 rows and 0 columns Presolve time: 0.00s Presolved: 394 rows, 137 columns, 833 nonzeros Variable types: 0 continuous, 137 integer (137 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 6.000000e+01, 181 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.00000 0 112 50.00000 60.00000 20.0% - 0s 0 0 58.50000 0 130 50.00000 58.50000 17.0% - 0s 0 0 58.05405 0 134 50.00000 58.05405 16.1% - 0s 0 0 57.00000 0 130 50.00000 57.00000 14.0% - 0s 0 0 56.43333 0 129 50.00000 56.43333 12.9% - 0s 0 0 55.95238 0 135 50.00000 55.95238 11.9% - 0s 0 0 55.61733 0 135 50.00000 55.61733 11.2% - 0s 0 0 55.30769 0 126 50.00000 55.30769 10.6% - 0s 0 0 55.14953 0 128 50.00000 55.14953 10.3% - 0s 0 0 55.00000 0 129 50.00000 55.00000 10.0% - 0s 0 0 54.94444 0 130 50.00000 54.94444 9.89% - 0s 0 0 54.86423 0 131 50.00000 54.86423 9.73% - 0s H 0 0 51.0000000 54.86423 7.58% - 0s 0 0 54.81818 0 129 51.00000 54.81818 7.49% - 0s 0 0 54.76703 0 129 51.00000 54.76703 7.39% - 0s 0 0 54.76703 0 126 51.00000 54.76703 7.39% - 0s H 0 0 53.0000000 54.76703 3.33% - 0s 0 2 54.76703 0 125 53.00000 54.76703 3.33% - 0s Cutting planes: Zero half: 95 Explored 27 nodes (1921 simplex iterations) in 0.12 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%