Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:37:20 2012 Optimize a model with 584 rows, 153 columns and 1168 nonzeros Presolve removed 115 rows and 2 columns Presolve time: 0.00s Presolved: 469 rows, 151 columns, 1008 nonzeros Variable types: 0 continuous, 151 integer (151 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 6.342308e+01, 280 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 63.42308 0 146 51.00000 63.42308 24.4% - 0s H 0 0 52.0000000 63.42308 22.0% - 0s 0 0 62.26703 0 151 52.00000 62.26703 19.7% - 0s 0 0 61.38674 0 148 52.00000 61.38674 18.1% - 0s 0 0 60.75000 0 144 52.00000 60.75000 16.8% - 0s 0 0 60.45055 0 149 52.00000 60.45055 16.3% - 0s H 0 0 53.0000000 60.45055 14.1% - 0s 0 0 60.05214 0 149 53.00000 60.05214 13.3% - 0s 0 0 59.75599 0 149 53.00000 59.75599 12.7% - 0s 0 0 59.62983 0 151 53.00000 59.62983 12.5% - 0s 0 0 59.56923 0 150 53.00000 59.56923 12.4% - 0s 0 0 59.35863 0 149 53.00000 59.35863 12.0% - 0s 0 0 59.24031 0 151 53.00000 59.24031 11.8% - 0s 0 0 59.16182 0 150 53.00000 59.16182 11.6% - 0s 0 0 59.15517 0 150 53.00000 59.15517 11.6% - 0s 0 0 59.15517 0 149 53.00000 59.15517 11.6% - 0s H 0 0 54.0000000 59.15517 9.55% - 0s 0 2 59.15496 0 149 54.00000 59.15496 9.55% - 0s Cutting planes: Zero half: 131 Explored 894 nodes (32136 simplex iterations) in 1.27 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%