Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:39 2012 Optimize a model with 161 rows, 52 columns and 322 nonzeros Presolve removed 46 rows and 0 columns Presolve time: 0.00s Presolved: 115 rows, 52 columns, 261 nonzeros Variable types: 0 continuous, 52 integer (52 binary) Found heuristic solution: objective 16.0000000 Root relaxation: objective 2.125000e+01, 78 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 21.25000 0 44 16.00000 21.25000 32.8% - 0s H 0 0 17.0000000 21.25000 25.0% - 0s 0 0 20.50000 0 41 17.00000 20.50000 20.6% - 0s 0 0 20.27778 0 49 17.00000 20.27778 19.3% - 0s H 0 0 18.0000000 20.27778 12.7% - 0s 0 0 19.71429 0 50 18.00000 19.71429 9.52% - 0s 0 0 19.57143 0 49 18.00000 19.57143 8.73% - 0s 0 0 19.33333 0 48 18.00000 19.33333 7.41% - 0s 0 0 19.27000 0 51 18.00000 19.27000 7.06% - 0s 0 0 19.19231 0 51 18.00000 19.19231 6.62% - 0s 0 0 19.19048 0 51 18.00000 19.19048 6.61% - 0s 0 0 19.19048 0 49 18.00000 19.19048 6.61% - 0s 0 2 19.19048 0 49 18.00000 19.19048 6.61% - 0s Cutting planes: Gomory: 2 Zero half: 23 Explored 7 nodes (381 simplex iterations) in 0.02 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%