Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:33:20 2012 Optimize a model with 461 rows, 139 columns and 922 nonzeros Presolve removed 72 rows and 0 columns Presolve time: 0.00s Presolved: 389 rows, 139 columns, 824 nonzeros Variable types: 0 continuous, 139 integer (139 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 5.950000e+01, 220 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 59.50000 0 105 51.00000 59.50000 16.7% - 0s 0 0 58.53676 0 131 51.00000 58.53676 14.8% - 0s H 0 0 52.0000000 58.53676 12.6% - 0s 0 0 57.40000 0 126 52.00000 57.40000 10.4% - 0s 0 0 57.04167 0 132 52.00000 57.04167 9.70% - 0s 0 0 56.47489 0 133 52.00000 56.47489 8.61% - 0s H 0 0 53.0000000 56.47489 6.56% - 0s 0 0 56.00000 0 130 53.00000 56.00000 5.66% - 0s 0 0 56.00000 0 135 53.00000 56.00000 5.66% - 0s 0 0 56.00000 0 111 53.00000 56.00000 5.66% - 0s 0 2 56.00000 0 108 53.00000 56.00000 5.66% - 0s H 10 10 54.0000000 56.00000 3.70% 47.7 0s Cutting planes: Zero half: 81 Explored 37 nodes (2369 simplex iterations) in 0.12 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%