Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:45 2012 Optimize a model with 284 rows, 74 columns and 568 nonzeros Presolve removed 90 rows and 1 columns Presolve time: 0.00s Presolved: 194 rows, 73 columns, 451 nonzeros Variable types: 0 continuous, 73 integer (73 binary) Found heuristic solution: objective 22.0000000 Root relaxation: objective 2.925000e+01, 106 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 29.25000 0 59 22.00000 29.25000 33.0% - 0s H 0 0 24.0000000 29.25000 21.9% - 0s 0 0 28.33333 0 69 24.00000 28.33333 18.1% - 0s H 0 0 25.0000000 28.33333 13.3% - 0s 0 0 28.20000 0 69 25.00000 28.20000 12.8% - 0s 0 0 28.00000 0 57 25.00000 28.00000 12.0% - 0s H 0 0 26.0000000 28.00000 7.69% - 0s H 0 0 27.0000000 28.00000 3.70% - 0s 0 0 cutoff 0 27.00000 27.99997 3.70% - 0s Cutting planes: Gomory: 2 Zero half: 50 Explored 0 nodes (263 simplex iterations) in 0.02 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.700000000000e+01, best bound 2.700000000000e+01, gap 0.0%