Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:12:52 2012 Optimize a model with 761 rows, 174 columns and 1522 nonzeros Presolve removed 183 rows and 2 columns Presolve time: 0.01s Presolved: 578 rows, 172 columns, 1275 nonzeros Variable types: 0 continuous, 172 integer (172 binary) Found heuristic solution: objective 49.0000000 Root relaxation: objective 6.955769e+01, 374 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 69.55769 0 165 49.00000 69.55769 42.0% - 0s H 0 0 54.0000000 69.55769 28.8% - 0s 0 0 68.96320 0 169 54.00000 68.96320 27.7% - 0s H 0 0 55.0000000 68.96320 25.4% - 0s 0 0 68.00946 0 167 55.00000 68.00946 23.7% - 0s 0 0 67.24894 0 169 55.00000 67.24894 22.3% - 0s H 0 0 57.0000000 67.24894 18.0% - 0s 0 0 66.97561 0 169 57.00000 66.97561 17.5% - 0s H 0 0 58.0000000 66.97561 15.5% - 0s H 0 0 60.0000000 66.97561 11.6% - 0s 0 0 66.84879 0 168 60.00000 66.84879 11.4% - 0s 0 0 66.75251 0 167 60.00000 66.75251 11.3% - 0s 0 0 66.65944 0 169 60.00000 66.65944 11.1% - 0s 0 0 66.58752 0 170 60.00000 66.58752 11.0% - 0s 0 0 66.49794 0 167 60.00000 66.49794 10.8% - 0s 0 0 66.36082 0 166 60.00000 66.36082 10.6% - 0s 0 0 66.25780 0 170 60.00000 66.25780 10.4% - 0s 0 0 66.22430 0 170 60.00000 66.22430 10.4% - 0s 0 0 66.22430 0 170 60.00000 66.22430 10.4% - 0s 0 2 66.22321 0 170 60.00000 66.22321 10.4% - 0s Cutting planes: Clique: 1 Zero half: 117 Explored 781 nodes (31623 simplex iterations) in 1.34 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.000000000000e+01, best bound 6.000000000000e+01, gap 0.0%