Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:43 2012 Optimize a model with 222 rows, 68 columns and 444 nonzeros Presolve removed 71 rows and 2 columns Presolve time: 0.00s Presolved: 151 rows, 66 columns, 348 nonzeros Variable types: 0 continuous, 66 integer (66 binary) Found heuristic solution: objective 21.0000000 Root relaxation: objective 2.750000e+01, 88 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 27.50000 0 45 21.00000 27.50000 31.0% - 0s H 0 0 24.0000000 27.50000 14.6% - 0s 0 0 27.00000 0 49 24.00000 27.00000 12.5% - 0s H 0 0 25.0000000 27.00000 8.00% - 0s 0 0 26.90000 0 56 25.00000 26.90000 7.60% - 0s 0 0 26.55556 0 57 25.00000 26.55556 6.22% - 0s 0 0 26.42857 0 58 25.00000 26.42857 5.71% - 0s 0 0 26.25000 0 51 25.00000 26.25000 5.00% - 0s 0 0 26.00000 0 53 25.00000 26.00000 4.00% - 0s 0 0 cutoff 0 25.00000 25.99997 4.00% - 0s Cutting planes: Zero half: 25 Explored 0 nodes (330 simplex iterations) in 0.02 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.500000000000e+01, best bound 2.500000000000e+01, gap 0.0%