Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:37:31 2012 Optimize a model with 581 rows, 153 columns and 1162 nonzeros Presolve removed 103 rows and 0 columns Presolve time: 0.00s Presolved: 478 rows, 153 columns, 1024 nonzeros Variable types: 0 continuous, 153 integer (153 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 6.450000e+01, 229 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 0 119 50.00000 64.50000 29.0% - 0s 0 0 63.15000 0 148 50.00000 63.15000 26.3% - 0s H 0 0 51.0000000 63.15000 23.8% - 0s 0 0 61.98333 0 151 51.00000 61.98333 21.5% - 0s 0 0 61.19737 0 144 51.00000 61.19737 20.0% - 0s 0 0 60.47005 0 150 51.00000 60.47005 18.6% - 0s 0 0 60.01914 0 146 51.00000 60.01914 17.7% - 0s H 0 0 54.0000000 60.01914 11.1% - 0s H 0 0 56.0000000 60.01914 7.18% - 0s 0 0 59.75115 0 150 56.00000 59.75115 6.70% - 0s 0 0 59.53818 0 149 56.00000 59.53818 6.32% - 0s 0 0 59.42509 0 151 56.00000 59.42509 6.12% - 0s 0 0 59.37058 0 150 56.00000 59.37058 6.02% - 0s 0 0 59.27612 0 150 56.00000 59.27612 5.85% - 0s 0 0 59.22144 0 150 56.00000 59.22144 5.75% - 0s 0 0 59.22144 0 150 56.00000 59.22144 5.75% - 0s 0 2 59.21584 0 148 56.00000 59.21584 5.74% - 0s Cutting planes: Gomory: 2 Zero half: 113 Explored 59 nodes (4693 simplex iterations) in 0.25 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0%