Gurobi 5.0.1 (linux64) logging started Sun Nov 18 03:22:22 2012 Optimize a model with 237 rows, 187 columns and 777 nonzeros Presolve removed 0 rows and 1 columns Presolve time: 0.00s Presolved: 237 rows, 186 columns, 776 nonzeros Variable types: 0 continuous, 186 integer (185 binary) Found heuristic solution: objective 45.0000000 Root relaxation: objective 0.000000e+00, 101 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 67 45.00000 0.00000 100% - 0s H 0 0 43.0000000 0.00000 100% - 0s H 0 0 36.0000000 0.00000 100% - 0s 0 0 0.49254 0 68 36.00000 0.49254 98.6% - 0s H 0 0 31.0000000 0.49254 98.4% - 0s 0 0 1.16479 0 70 31.00000 1.16479 96.2% - 0s H 0 0 29.0000000 1.16479 96.0% - 0s 0 0 1.51094 0 71 29.00000 1.51094 94.8% - 0s 0 0 1.51395 0 72 29.00000 1.51395 94.8% - 0s 0 0 1.51395 0 72 29.00000 1.51395 94.8% - 0s H 0 0 28.0000000 1.51395 94.6% - 0s H 0 0 27.0000000 1.51395 94.4% - 0s 0 2 1.51785 0 72 27.00000 1.51785 94.4% - 0s * 24 24 15 24.0000000 3.39523 85.9% 32.2 0s * 53 36 20 22.0000000 3.41408 84.5% 25.6 0s * 109 47 8 19.0000000 7.00056 63.2% 29.1 0s * 135 38 9 18.0000000 7.20719 60.0% 28.7 0s Cutting planes: Gomory: 4 Zero half: 4 Explored 302 nodes (8486 simplex iterations) in 0.34 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.800000000000e+01, best bound 1.800000000000e+01, gap 0.0%