Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:34:54 2012 Optimize a model with 592 rows, 148 columns and 1184 nonzeros Presolve removed 147 rows and 1 columns Presolve time: 0.00s Presolved: 445 rows, 147 columns, 978 nonzeros Variable types: 0 continuous, 147 integer (147 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 6.107692e+01, 280 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 61.07692 0 135 48.00000 61.07692 27.2% - 0s H 0 0 51.0000000 61.07692 19.8% - 0s 0 0 60.08068 0 144 51.00000 60.08068 17.8% - 0s 0 0 59.63128 0 145 51.00000 59.63128 16.9% - 0s 0 0 59.03297 0 146 51.00000 59.03297 15.8% - 0s 0 0 58.67854 0 144 51.00000 58.67854 15.1% - 0s 0 0 58.06169 0 141 51.00000 58.06169 13.8% - 0s H 0 0 52.0000000 58.06169 11.7% - 0s 0 0 57.89590 0 145 52.00000 57.89590 11.3% - 0s 0 0 57.74593 0 143 52.00000 57.74593 11.0% - 0s 0 0 57.67693 0 144 52.00000 57.67693 10.9% - 0s 0 0 57.62566 0 145 52.00000 57.62566 10.8% - 0s 0 0 57.55417 0 144 52.00000 57.55417 10.7% - 0s 0 0 57.53976 0 145 52.00000 57.53976 10.7% - 0s 0 0 57.53976 0 144 52.00000 57.53976 10.7% - 0s H 0 0 53.0000000 57.53976 8.57% - 0s H 0 0 54.0000000 57.53976 6.56% - 0s 0 2 57.53970 0 144 54.00000 57.53970 6.55% - 0s Cutting planes: Clique: 1 Zero half: 87 Explored 95 nodes (5299 simplex iterations) in 0.29 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%