Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:36:05 2012 Optimize a model with 614 rows, 151 columns and 1228 nonzeros Presolve removed 151 rows and 2 columns Presolve time: 0.00s Presolved: 463 rows, 149 columns, 1024 nonzeros Variable types: 0 continuous, 149 integer (149 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 6.183333e+01, 308 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 61.83333 0 131 45.00000 61.83333 37.4% - 0s H 0 0 48.0000000 61.83333 28.8% - 0s 0 0 60.68796 0 146 48.00000 60.68796 26.4% - 0s 0 0 60.25765 0 147 48.00000 60.25765 25.5% - 0s H 0 0 51.0000000 60.25765 18.2% - 0s H 0 0 54.0000000 60.25765 11.6% - 0s 0 0 59.57735 0 145 54.00000 59.57735 10.3% - 0s H 0 0 55.0000000 59.57735 8.32% - 0s 0 0 58.96825 0 146 55.00000 58.96825 7.22% - 0s 0 0 58.67649 0 147 55.00000 58.67649 6.68% - 0s 0 0 58.57883 0 147 55.00000 58.57883 6.51% - 0s 0 0 58.46713 0 148 55.00000 58.46713 6.30% - 0s 0 0 58.12759 0 148 55.00000 58.12759 5.69% - 0s 0 0 57.94452 0 149 55.00000 57.94452 5.35% - 0s 0 0 57.91982 0 149 55.00000 57.91982 5.31% - 0s 0 0 57.91982 0 149 55.00000 57.91982 5.31% - 0s 0 2 57.91799 0 147 55.00000 57.91799 5.31% - 0s Cutting planes: Clique: 1 Zero half: 73 Explored 40 nodes (3299 simplex iterations) in 0.21 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.500000000000e+01, best bound 5.500000000000e+01, gap 0.0%