Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:40 2012 Optimize a model with 152 rows, 58 columns and 304 nonzeros Presolve removed 38 rows and 3 columns Presolve time: 0.00s Presolved: 114 rows, 55 columns, 250 nonzeros Variable types: 0 continuous, 55 integer (55 binary) Found heuristic solution: objective 20.0000000 Root relaxation: objective 2.550000e+01, 72 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 25.50000 0 47 20.00000 25.50000 27.5% - 0s H 0 0 21.0000000 25.50000 21.4% - 0s 0 0 24.50000 0 43 21.00000 24.50000 16.7% - 0s H 0 0 22.0000000 24.50000 11.4% - 0s 0 0 24.50000 0 45 22.00000 24.50000 11.4% - 0s 0 0 24.22222 0 53 22.00000 24.22222 10.1% - 0s 0 0 23.88889 0 51 22.00000 23.88889 8.59% - 0s 0 0 23.80000 0 54 22.00000 23.80000 8.18% - 0s 0 0 23.80000 0 52 22.00000 23.80000 8.18% - 0s 0 0 23.72727 0 53 22.00000 23.72727 7.85% - 0s H 0 0 23.0000000 23.72727 3.16% - 0s Cutting planes: Zero half: 16 Explored 0 nodes (187 simplex iterations) in 0.02 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.300000000000e+01, best bound 2.300000000000e+01, gap 0.0%