Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:42:19 2012 Optimize a model with 621 rows, 159 columns and 1242 nonzeros Presolve removed 134 rows and 0 columns Presolve time: 0.00s Presolved: 487 rows, 159 columns, 1059 nonzeros Variable types: 0 continuous, 159 integer (159 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 6.550000e+01, 275 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 65.50000 0 129 48.00000 65.50000 36.5% - 0s 0 0 64.09565 0 158 48.00000 64.09565 33.5% - 0s H 0 0 49.0000000 64.09565 30.8% - 0s 0 0 62.92266 0 159 49.00000 62.92266 28.4% - 0s H 0 0 53.0000000 62.92266 18.7% - 0s 0 0 62.56139 0 158 53.00000 62.56139 18.0% - 0s 0 0 61.93414 0 158 53.00000 61.93414 16.9% - 0s 0 0 61.72908 0 159 53.00000 61.72908 16.5% - 0s 0 0 61.58540 0 158 53.00000 61.58540 16.2% - 0s 0 0 61.41454 0 157 53.00000 61.41454 15.9% - 0s 0 0 61.25978 0 159 53.00000 61.25978 15.6% - 0s 0 0 61.20317 0 159 53.00000 61.20317 15.5% - 0s 0 0 61.04402 0 158 53.00000 61.04402 15.2% - 0s 0 0 60.98477 0 157 53.00000 60.98477 15.1% - 0s 0 0 60.93572 0 155 53.00000 60.93572 15.0% - 0s 0 0 60.83928 0 157 53.00000 60.83928 14.8% - 0s 0 0 60.80589 0 158 53.00000 60.80589 14.7% - 0s 0 0 60.80589 0 157 53.00000 60.80589 14.7% - 0s H 0 0 54.0000000 60.80589 12.6% - 0s 0 2 60.80587 0 157 54.00000 60.80587 12.6% - 0s * 275 64 22 55.0000000 58.68416 6.70% 38.7 0s Cutting planes: Zero half: 136 Explored 968 nodes (34319 simplex iterations) in 1.46 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%