Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:55 2012 Optimize a model with 483 rows, 143 columns and 966 nonzeros Presolve removed 84 rows and 1 columns Presolve time: 0.00s Presolved: 399 rows, 142 columns, 846 nonzeros Variable types: 0 continuous, 142 integer (142 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.175000e+01, 221 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 61.75000 0 119 47.00000 61.75000 31.4% - 0s H 0 0 49.0000000 61.75000 26.0% - 0s 0 0 60.50000 0 117 49.00000 60.50000 23.5% - 0s 0 0 59.88698 0 140 49.00000 59.88698 22.2% - 0s 0 0 58.92000 0 139 49.00000 58.92000 20.2% - 0s 0 0 58.35750 0 136 49.00000 58.35750 19.1% - 0s H 0 0 52.0000000 58.35750 12.2% - 0s 0 0 57.45833 0 138 52.00000 57.45833 10.5% - 0s 0 0 57.18149 0 141 52.00000 57.18149 10.0% - 0s 0 0 57.07883 0 139 52.00000 57.07883 9.77% - 0s 0 0 57.06054 0 139 52.00000 57.06054 9.73% - 0s 0 0 57.06054 0 139 52.00000 57.06054 9.73% - 0s 0 2 57.05191 0 139 52.00000 57.05191 9.72% - 0s H 161 34 53.0000000 55.82199 5.32% 30.1 0s Cutting planes: Clique: 1 Zero half: 100 Explored 312 nodes (9216 simplex iterations) in 0.36 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%