Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:12 2012 Optimize a model with 573 rows, 145 columns and 1146 nonzeros Presolve removed 129 rows and 0 columns Presolve time: 0.00s Presolved: 444 rows, 145 columns, 970 nonzeros Variable types: 0 continuous, 145 integer (145 binary) Found heuristic solution: objective 46.0000000 Root relaxation: objective 5.900000e+01, 267 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 0 114 46.00000 59.00000 28.3% - 0s 0 0 58.31250 0 134 46.00000 58.31250 26.8% - 0s 0 0 57.74331 0 144 46.00000 57.74331 25.5% - 0s 0 0 56.93652 0 141 46.00000 56.93652 23.8% - 0s H 0 0 47.0000000 56.93652 21.1% - 0s 0 0 56.33117 0 141 47.00000 56.33117 19.9% - 0s 0 0 55.98651 0 144 47.00000 55.98651 19.1% - 0s 0 0 55.91998 0 143 47.00000 55.91998 19.0% - 0s 0 0 55.85329 0 143 47.00000 55.85329 18.8% - 0s 0 0 55.78374 0 144 47.00000 55.78374 18.7% - 0s 0 0 55.65876 0 144 47.00000 55.65876 18.4% - 0s 0 0 55.55844 0 143 47.00000 55.55844 18.2% - 0s H 0 0 48.0000000 55.55844 15.7% - 0s 0 0 55.52853 0 142 48.00000 55.52853 15.7% - 0s 0 0 55.52853 0 142 48.00000 55.52853 15.7% - 0s 0 0 55.52853 0 142 48.00000 55.52853 15.7% - 0s 0 2 55.52716 0 142 48.00000 55.52716 15.7% - 0s H 23 10 51.0000000 55.04375 7.93% 44.9 0s Cutting planes: Zero half: 93 Explored 231 nodes (10132 simplex iterations) in 0.45 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.100000000000e+01, best bound 5.100000000000e+01, gap 0.0%