Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:44:46 2012 Optimize a model with 691 rows, 162 columns and 1382 nonzeros Presolve removed 157 rows and 0 columns Presolve time: 0.00s Presolved: 534 rows, 162 columns, 1165 nonzeros Variable types: 0 continuous, 162 integer (162 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.650000e+01, 272 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 66.50000 0 131 47.00000 66.50000 41.5% - 0s 0 0 64.57700 0 160 47.00000 64.57700 37.4% - 0s H 0 0 50.0000000 64.57700 29.2% - 0s 0 0 63.58990 0 161 50.00000 63.58990 27.2% - 0s 0 0 62.77142 0 161 50.00000 62.77142 25.5% - 0s 0 0 62.19371 0 160 50.00000 62.19371 24.4% - 0s 0 0 61.75731 0 160 50.00000 61.75731 23.5% - 0s H 0 0 54.0000000 61.75731 14.4% - 0s 0 0 61.54141 0 158 54.00000 61.54141 14.0% - 0s 0 0 61.31970 0 161 54.00000 61.31970 13.6% - 0s 0 0 61.28805 0 160 54.00000 61.28805 13.5% - 0s 0 0 61.26019 0 159 54.00000 61.26019 13.4% - 0s 0 0 61.23297 0 161 54.00000 61.23297 13.4% - 0s 0 0 61.23297 0 161 54.00000 61.23297 13.4% - 0s 0 2 61.23222 0 161 54.00000 61.23222 13.4% - 0s 613 203 58.48357 10 161 54.00000 58.58347 8.49% 39.3 5s H 1831 272 55.0000000 57.55556 4.65% 36.1 7s Cutting planes: Gomory: 4 Zero half: 74 Explored 2371 nodes (79784 simplex iterations) in 8.01 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%