Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:39 2012 Optimize a model with 171 rows, 56 columns and 342 nonzeros Presolve removed 52 rows and 0 columns Presolve time: 0.00s Presolved: 119 rows, 56 columns, 272 nonzeros Variable types: 0 continuous, 56 integer (56 binary) Found heuristic solution: objective 18.0000000 Root relaxation: objective 2.300000e+01, 94 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 23.00000 0 52 18.00000 23.00000 27.8% - 0s H 0 0 21.0000000 23.00000 9.52% - 0s 0 0 22.33333 0 54 21.00000 22.33333 6.35% - 0s 0 0 cutoff 0 21.00000 21.99998 4.76% - 0s Cutting planes: Gomory: 1 Zero half: 31 Explored 0 nodes (175 simplex iterations) in 0.01 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.100000000000e+01, best bound 2.100000000000e+01, gap 0.0%