Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:08 2012 Optimize a model with 438 rows, 137 columns and 876 nonzeros Presolve removed 87 rows and 3 columns Presolve time: 0.00s Presolved: 351 rows, 134 columns, 744 nonzeros Variable types: 0 continuous, 134 integer (134 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 5.900000e+01, 187 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 0 102 48.00000 59.00000 22.9% - 0s 0 0 58.00000 0 129 48.00000 58.00000 20.8% - 0s H 0 0 50.0000000 58.00000 16.0% - 0s 0 0 57.66667 0 123 50.00000 57.66667 15.3% - 0s 0 0 56.89420 0 128 50.00000 56.89420 13.8% - 0s H 0 0 52.0000000 56.89420 9.41% - 0s 0 0 56.39459 0 130 52.00000 56.39459 8.45% - 0s 0 0 56.06250 0 133 52.00000 56.06250 7.81% - 0s 0 0 55.83381 0 130 52.00000 55.83381 7.37% - 0s 0 0 55.77778 0 132 52.00000 55.77778 7.26% - 0s 0 0 55.70266 0 134 52.00000 55.70266 7.12% - 0s 0 0 55.58400 0 133 52.00000 55.58400 6.89% - 0s 0 0 55.52307 0 132 52.00000 55.52307 6.78% - 0s 0 0 55.40265 0 132 52.00000 55.40265 6.54% - 0s 0 0 55.36192 0 133 52.00000 55.36192 6.47% - 0s 0 0 55.36192 0 133 52.00000 55.36192 6.47% - 0s 0 2 55.36160 0 133 52.00000 55.36160 6.46% - 0s Cutting planes: Gomory: 1 Zero half: 97 Explored 97 nodes (4078 simplex iterations) in 0.19 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%