Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:51:55 2012 Optimize a model with 656 rows, 115 columns and 1312 nonzeros Presolve removed 222 rows and 0 columns Presolve time: 0.00s Presolved: 434 rows, 115 columns, 1065 nonzeros Variable types: 0 continuous, 115 integer (115 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 4.054545e+01, 352 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 40.54545 0 114 27.00000 40.54545 50.2% - 0s H 0 0 29.0000000 40.54545 39.8% - 0s 0 0 40.18695 0 114 29.00000 40.18695 38.6% - 0s 0 0 39.92014 0 113 29.00000 39.92014 37.7% - 0s 0 0 39.67294 0 114 29.00000 39.67294 36.8% - 0s H 0 0 31.0000000 39.67294 28.0% - 0s 0 0 39.50891 0 114 31.00000 39.50891 27.4% - 0s 0 0 39.23485 0 114 31.00000 39.23485 26.6% - 0s 0 0 39.08967 0 115 31.00000 39.08967 26.1% - 0s 0 0 38.95865 0 114 31.00000 38.95865 25.7% - 0s 0 0 38.73293 0 113 31.00000 38.73293 24.9% - 0s 0 0 38.70808 0 113 31.00000 38.70808 24.9% - 0s 0 0 38.70682 0 114 31.00000 38.70682 24.9% - 0s 0 0 38.70682 0 113 31.00000 38.70682 24.9% - 0s 0 2 38.70609 0 113 31.00000 38.70609 24.9% - 0s H 27 11 32.0000000 38.70609 21.0% 25.4 0s 615 153 35.50000 8 114 32.00000 35.62162 11.3% 27.5 5s 638 169 34.00000 10 115 32.00000 35.62162 11.3% 26.6 10s Cutting planes: Clique: 1 Zero half: 81 Explored 1917 nodes (55561 simplex iterations) in 11.99 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.200000000000e+01, best bound 3.200000000000e+01, gap 0.0%