Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:43 2012 Optimize a model with 412 rows, 132 columns and 824 nonzeros Presolve removed 72 rows and 3 columns Presolve time: 0.00s Presolved: 340 rows, 129 columns, 710 nonzeros Variable types: 0 continuous, 129 integer (129 binary) Found heuristic solution: objective 41.0000000 Root relaxation: objective 5.800000e+01, 179 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 58.00000 0 108 41.00000 58.00000 41.5% - 0s H 0 0 42.0000000 58.00000 38.1% - 0s 0 0 56.39623 0 126 42.00000 56.39623 34.3% - 0s H 0 0 45.0000000 56.39623 25.3% - 0s H 0 0 47.0000000 56.39623 20.0% - 0s 0 0 54.50000 0 125 47.00000 54.50000 16.0% - 0s 0 0 54.38889 0 122 47.00000 54.38889 15.7% - 0s 0 0 54.33333 0 127 47.00000 54.33333 15.6% - 0s H 0 0 48.0000000 54.33333 13.2% - 0s 0 0 53.87054 0 121 48.00000 53.87054 12.2% - 0s 0 0 53.44979 0 128 48.00000 53.44979 11.4% - 0s 0 0 53.35909 0 127 48.00000 53.35909 11.2% - 0s 0 0 53.17917 0 127 48.00000 53.17917 10.8% - 0s 0 0 53.16331 0 127 48.00000 53.16331 10.8% - 0s 0 0 53.16331 0 125 48.00000 53.16331 10.8% - 0s H 0 0 49.0000000 53.16331 8.50% - 0s 0 2 53.16331 0 125 49.00000 53.16331 8.50% - 0s H 129 15 50.0000000 51.80734 3.61% 30.1 0s Cutting planes: Gomory: 1 Zero half: 125 Explored 155 nodes (5289 simplex iterations) in 0.21 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%