Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:08 2012 Optimize a model with 440 rows, 137 columns and 880 nonzeros Presolve removed 112 rows and 9 columns Presolve time: 0.00s Presolved: 328 rows, 128 columns, 704 nonzeros Variable types: 0 continuous, 128 integer (128 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 5.900000e+01, 175 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 98 51.00000 59.00000 15.7% - 0s 0 0 58.21429 0 121 51.00000 58.21429 14.1% - 0s 0 0 57.25000 0 116 51.00000 57.25000 12.3% - 0s 0 0 57.11500 0 121 51.00000 57.11500 12.0% - 0s H 0 0 52.0000000 57.11500 9.84% - 0s 0 0 56.55000 0 123 52.00000 56.55000 8.75% - 0s 0 0 56.03846 0 124 52.00000 56.03846 7.77% - 0s 0 0 55.81761 0 121 52.00000 55.81761 7.34% - 0s H 0 0 53.0000000 55.81761 5.32% - 0s 0 0 55.61212 0 124 53.00000 55.61212 4.93% - 0s 0 0 55.54483 0 122 53.00000 55.54483 4.80% - 0s 0 0 55.49213 0 125 53.00000 55.49213 4.70% - 0s 0 0 55.42373 0 125 53.00000 55.42373 4.57% - 0s 0 0 55.38869 0 121 53.00000 55.38869 4.51% - 0s 0 0 55.34807 0 126 53.00000 55.34807 4.43% - 0s 0 0 55.34807 0 126 53.00000 55.34807 4.43% - 0s H 0 0 54.0000000 55.34807 2.50% - 0s 0 2 55.34531 0 126 54.00000 55.34531 2.49% - 0s Cutting planes: Zero half: 49 Explored 13 nodes (1215 simplex iterations) in 0.09 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.400000000000e+01, best bound 5.400000000000e+01, gap 0.0%