Gurobi 5.0.1 (linux64) logging started Sun Nov 18 03:25:20 2012 Optimize a model with 249 rows, 197 columns and 817 nonzeros Presolve removed 0 rows and 2 columns Presolve time: 0.00s Presolved: 249 rows, 195 columns, 815 nonzeros Variable types: 0 continuous, 195 integer (194 binary) Found heuristic solution: objective 50.0000000 Root relaxation: objective 0.000000e+00, 116 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 70 50.00000 0.00000 100% - 0s H 0 0 42.0000000 0.00000 100% - 0s 0 0 0.51705 0 71 42.00000 0.51705 98.8% - 0s 0 0 1.00000 0 72 42.00000 1.00000 97.6% - 0s 0 0 1.09772 0 73 42.00000 1.09772 97.4% - 0s H 0 0 34.0000000 1.09772 96.8% - 0s H 0 0 30.0000000 1.09772 96.3% - 0s 0 0 1.29219 0 73 30.00000 1.29219 95.7% - 0s H 0 0 28.0000000 1.29219 95.4% - 0s H 0 0 27.0000000 1.29219 95.2% - 0s 0 2 1.34494 0 73 27.00000 1.34494 95.0% - 0s * 26 26 19 24.0000000 2.97656 87.6% 29.9 0s H 30 21 22.0000000 2.97656 86.5% 26.0 0s * 103 61 21 21.0000000 5.32774 74.6% 23.7 0s * 127 74 18 20.0000000 5.36187 73.2% 22.9 0s * 152 71 13 19.0000000 6.61098 65.2% 22.8 0s * 491 84 12 18.0000000 11.00000 38.9% 20.2 0s Cutting planes: Gomory: 4 Zero half: 1 Explored 844 nodes (16446 simplex iterations) in 0.54 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%