Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:33 2012 Optimize a model with 443 rows, 127 columns and 886 nonzeros Presolve removed 89 rows and 2 columns Presolve time: 0.00s Presolved: 354 rows, 125 columns, 765 nonzeros Variable types: 0 continuous, 125 integer (125 binary) Found heuristic solution: objective 39.0000000 Root relaxation: objective 5.350000e+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 53.50000 0 97 39.00000 53.50000 37.2% - 0s H 0 0 40.0000000 53.50000 33.8% - 0s 0 0 52.33333 0 124 40.00000 52.33333 30.8% - 0s 0 0 51.58824 0 125 40.00000 51.58824 29.0% - 0s H 0 0 42.0000000 51.58824 22.8% - 0s 0 0 51.13095 0 123 42.00000 51.13095 21.7% - 0s 0 0 50.60922 0 122 42.00000 50.60922 20.5% - 0s 0 0 50.36842 0 123 42.00000 50.36842 19.9% - 0s 0 0 50.00947 0 122 42.00000 50.00947 19.1% - 0s 0 0 49.64397 0 122 42.00000 49.64397 18.2% - 0s H 0 0 43.0000000 49.64397 15.5% - 0s 0 0 49.45547 0 123 43.00000 49.45547 15.0% - 0s 0 0 49.33197 0 122 43.00000 49.33197 14.7% - 0s 0 0 49.25463 0 124 43.00000 49.25463 14.5% - 0s 0 0 49.17120 0 121 43.00000 49.17120 14.4% - 0s 0 0 49.12352 0 123 43.00000 49.12352 14.2% - 0s 0 0 49.12352 0 123 43.00000 49.12352 14.2% - 0s 0 2 49.12326 0 123 43.00000 49.12326 14.2% - 0s * 36 21 8 44.0000000 49.06738 11.5% 26.5 0s * 110 30 11 45.0000000 48.58071 7.96% 26.3 0s Cutting planes: Zero half: 125 Explored 351 nodes (9934 simplex iterations) in 0.38 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.500000000000e+01, best bound 4.500000000000e+01, gap 0.0%