Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:37:23 2012 Optimize a model with 578 rows, 153 columns and 1156 nonzeros Presolve removed 107 rows and 0 columns Presolve time: 0.00s Presolved: 471 rows, 153 columns, 1016 nonzeros Variable types: 0 continuous, 153 integer (153 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 6.450000e+01, 250 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 64.50000 0 123 48.00000 64.50000 34.4% - 0s H 0 0 50.0000000 64.50000 29.0% - 0s 0 0 62.75000 0 145 50.00000 62.75000 25.5% - 0s 0 0 61.82424 0 149 50.00000 61.82424 23.6% - 0s H 0 0 51.0000000 61.82424 21.2% - 0s 0 0 60.98176 0 150 51.00000 60.98176 19.6% - 0s 0 0 60.72836 0 150 51.00000 60.72836 19.1% - 0s 0 0 60.39223 0 152 51.00000 60.39223 18.4% - 0s 0 0 60.20523 0 152 51.00000 60.20523 18.0% - 0s 0 0 60.07285 0 150 51.00000 60.07285 17.8% - 0s 0 0 59.79377 0 151 51.00000 59.79377 17.2% - 0s 0 0 59.75725 0 151 51.00000 59.75725 17.2% - 0s 0 0 59.75725 0 151 51.00000 59.75725 17.2% - 0s H 0 0 52.0000000 59.75725 14.9% - 0s 0 2 59.75617 0 151 52.00000 59.75617 14.9% - 0s H 26 17 53.0000000 59.68357 12.6% 55.1 0s 1441 299 cutoff 25 53.00000 56.88889 7.34% 33.5 5s Cutting planes: Gomory: 10 Zero half: 62 Explored 3085 nodes (82513 simplex iterations) in 6.88 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%