Gurobi 5.0.1 (linux64) logging started Sat Nov 17 23:44:03 2012 Optimize a model with 257 rows, 173 columns and 813 nonzeros Presolve time: 0.00s Presolved: 257 rows, 173 columns, 813 nonzeros Variable types: 0 continuous, 173 integer (173 binary) Found heuristic solution: objective 60.0000000 Found heuristic solution: objective 59.0000000 Root relaxation: objective 0.000000e+00, 71 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 45 59.00000 0.00000 100% - 0s H 0 0 50.0000000 0.00000 100% - 0s H 0 0 49.0000000 0.00000 100% - 0s 0 0 0.62424 0 47 49.00000 0.62424 98.7% - 0s H 0 0 45.0000000 0.62424 98.6% - 0s 0 0 0.64537 0 48 45.00000 0.64537 98.6% - 0s 0 0 0.67222 0 47 45.00000 0.67222 98.5% - 0s 0 0 0.74444 0 48 45.00000 0.74444 98.3% - 0s 0 0 0.92889 0 47 45.00000 0.92889 97.9% - 0s 0 0 0.95200 0 47 45.00000 0.95200 97.9% - 0s 0 0 0.95722 0 50 45.00000 0.95722 97.9% - 0s 0 0 0.95722 0 50 45.00000 0.95722 97.9% - 0s 0 2 1.02849 0 50 45.00000 1.02849 97.7% - 0s H 27 27 40.0000000 3.57647 91.1% 25.0 0s * 29 29 17 37.0000000 3.57647 90.3% 23.6 0s * 153 94 16 32.0000000 10.35345 67.6% 24.7 0s * 242 102 11 31.0000000 11.64146 62.4% 22.7 0s * 468 138 10 30.0000000 16.25000 45.8% 21.0 0s * 491 115 10 28.0000000 17.05714 39.1% 20.9 0s Cutting planes: Gomory: 1 Zero half: 1 Mod-K: 3 Explored 876 nodes (16254 simplex iterations) in 0.49 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.800000000000e+01, best bound 2.800000000000e+01, gap 0.0%