Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:57:10 2012 Optimize a model with 826 rows, 122 columns and 1652 nonzeros Presolve removed 338 rows and 0 columns Presolve time: 0.01s Presolved: 488 rows, 122 columns, 1294 nonzeros Variable types: 0 continuous, 122 integer (122 binary) Found heuristic solution: objective 26.0000000 Root relaxation: objective 4.025368e+01, 355 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 40.25368 0 122 26.00000 40.25368 54.8% - 0s 0 0 39.68344 0 120 26.00000 39.68344 52.6% - 0s H 0 0 27.0000000 39.68344 47.0% - 0s 0 0 39.47187 0 121 27.00000 39.47187 46.2% - 0s H 0 0 28.0000000 39.47187 41.0% - 0s 0 0 39.32096 0 120 28.00000 39.32096 40.4% - 0s 0 0 38.99047 0 120 28.00000 38.99047 39.3% - 0s 0 0 38.94497 0 120 28.00000 38.94497 39.1% - 0s 0 0 38.89436 0 120 28.00000 38.89436 38.9% - 0s 0 0 38.87911 0 120 28.00000 38.87911 38.9% - 0s 0 0 38.86008 0 121 28.00000 38.86008 38.8% - 0s 0 0 38.79914 0 120 28.00000 38.79914 38.6% - 0s 0 0 38.71539 0 120 28.00000 38.71539 38.3% - 0s 0 0 38.56277 0 120 28.00000 38.56277 37.7% - 0s 0 0 38.48961 0 120 28.00000 38.48961 37.5% - 0s 0 0 38.44407 0 121 28.00000 38.44407 37.3% - 0s 0 0 38.40072 0 121 28.00000 38.40072 37.1% - 0s 0 0 38.39293 0 121 28.00000 38.39293 37.1% - 0s 0 0 38.39293 0 121 28.00000 38.39293 37.1% - 0s 0 2 38.38430 0 121 28.00000 38.38430 37.1% - 0s H 78 41 29.0000000 37.47129 29.2% 48.4 0s * 80 39 10 30.0000000 37.47129 24.9% 47.6 0s 612 221 33.71429 6 122 30.00000 35.40600 18.0% 31.4 5s H 2925 481 31.0000000 33.50000 8.06% 27.8 9s Cutting planes: Gomory: 5 Clique: 1 Zero half: 37 Explored 3823 nodes (98249 simplex iterations) in 9.76 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%