Gurobi 5.0.1 (linux64) logging started Tue Nov 20 07:53:58 2012 Optimize a model with 1227 rows, 156 columns and 2454 nonzeros Presolve removed 517 rows and 0 columns Presolve time: 0.01s Presolved: 710 rows, 156 columns, 1918 nonzeros Variable types: 0 continuous, 156 integer (156 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 5.016223e+01, 444 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 50.16223 0 156 28.00000 50.16223 79.2% - 0s H 0 0 30.0000000 50.16223 67.2% - 0s 0 0 49.76552 0 155 30.00000 49.76552 65.9% - 0s 0 0 49.62127 0 155 30.00000 49.62127 65.4% - 0s 0 0 49.50163 0 155 30.00000 49.50163 65.0% - 0s H 0 0 31.0000000 49.50163 59.7% - 0s 0 0 49.33158 0 155 31.00000 49.33158 59.1% - 0s 0 0 49.08188 0 156 31.00000 49.08188 58.3% - 0s 0 0 48.97539 0 155 31.00000 48.97539 58.0% - 0s 0 0 48.85184 0 156 31.00000 48.85184 57.6% - 0s 0 0 48.78865 0 155 31.00000 48.78865 57.4% - 0s H 0 0 32.0000000 48.78865 52.5% - 0s 0 0 48.74424 0 155 32.00000 48.74424 52.3% - 0s 0 0 48.70612 0 156 32.00000 48.70612 52.2% - 0s H 0 0 33.0000000 48.70612 47.6% - 0s 0 0 48.64054 0 156 33.00000 48.64054 47.4% - 0s 0 0 48.61558 0 156 33.00000 48.61558 47.3% - 0s 0 0 48.59836 0 156 33.00000 48.59836 47.3% - 0s 0 0 48.59432 0 156 33.00000 48.59432 47.3% - 0s 0 0 48.59432 0 156 33.00000 48.59432 47.3% - 0s H 0 0 35.0000000 48.59432 38.8% - 0s 0 2 48.59426 0 156 35.00000 48.59426 38.8% - 0s H 54 29 36.0000000 48.05687 33.5% 56.8 0s H 81 41 37.0000000 47.63600 28.7% 61.8 0s 609 263 39.34884 17 156 37.00000 45.47544 22.9% 52.2 5s 1597 637 39.62500 28 84 37.00000 44.60096 20.5% 58.9 10s 3240 1444 42.51226 23 114 37.00000 43.14815 16.6% 50.7 15s 5897 2384 40.70270 34 106 37.00000 42.22532 14.1% 44.5 20s 8757 3115 38.38462 41 93 37.00000 41.50000 12.2% 41.2 25s 12492 3462 38.53185 27 91 37.00000 40.83329 10.4% 38.7 30s 15818 3398 38.79630 31 93 37.00000 40.34328 9.04% 37.2 35s 20373 2690 38.47368 29 91 37.00000 39.65611 7.18% 35.8 40s Cutting planes: Gomory: 6 Clique: 2 Zero half: 40 Explored 25491 nodes (864737 simplex iterations) in 44.77 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.700000000000e+01, best bound 3.700000000000e+01, gap 0.0%