Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:38 2012 Optimize a model with 122 rows, 47 columns and 244 nonzeros Presolve removed 53 rows and 11 columns Presolve time: 0.00s Presolved: 69 rows, 36 columns, 144 nonzeros Variable types: 0 continuous, 36 integer (36 binary) Found heuristic solution: objective 16.0000000 Root relaxation: objective 2.100000e+01, 41 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 21.00000 0 34 16.00000 21.00000 31.2% - 0s H 0 0 17.0000000 21.00000 23.5% - 0s H 0 0 18.0000000 21.00000 16.7% - 0s 0 0 19.75000 0 33 18.00000 19.75000 9.72% - 0s H 0 0 19.0000000 19.75000 3.95% - 0s Cutting planes: Zero half: 6 Explored 0 nodes (71 simplex iterations) in 0.00 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.900000000000e+01, best bound 1.900000000000e+01, gap 0.0%