Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:57 2012 Optimize a model with 546 rows, 148 columns and 1092 nonzeros Presolve removed 113 rows and 2 columns Presolve time: 0.00s Presolved: 433 rows, 146 columns, 932 nonzeros Variable types: 0 continuous, 146 integer (146 binary) Found heuristic solution: objective 49.0000000 Root relaxation: objective 6.250000e+01, 274 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 62.50000 0 115 49.00000 62.50000 27.6% - 0s 0 0 61.32258 0 146 49.00000 61.32258 25.1% - 0s H 0 0 51.0000000 61.32258 20.2% - 0s 0 0 59.93902 0 146 51.00000 59.93902 17.5% - 0s 0 0 59.27248 0 145 51.00000 59.27248 16.2% - 0s 0 0 58.93717 0 145 51.00000 58.93717 15.6% - 0s 0 0 58.71480 0 143 51.00000 58.71480 15.1% - 0s 0 0 58.64577 0 146 51.00000 58.64577 15.0% - 0s 0 0 58.54465 0 145 51.00000 58.54465 14.8% - 0s 0 0 58.38971 0 144 51.00000 58.38971 14.5% - 0s 0 0 58.28217 0 144 51.00000 58.28217 14.3% - 0s 0 0 58.21573 0 146 51.00000 58.21573 14.1% - 0s 0 0 58.15395 0 146 51.00000 58.15395 14.0% - 0s 0 0 58.07116 0 146 51.00000 58.07116 13.9% - 0s 0 0 58.04130 0 146 51.00000 58.04130 13.8% - 0s 0 0 58.04130 0 146 51.00000 58.04130 13.8% - 0s H 0 0 52.0000000 58.04130 11.6% - 0s 0 2 58.02844 0 146 52.00000 58.02844 11.6% - 0s H 27 15 53.0000000 57.75758 8.98% 54.4 0s Cutting planes: Zero half: 120 Explored 442 nodes (17696 simplex iterations) in 0.72 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%