Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:42 2012 Optimize a model with 223 rows, 66 columns and 446 nonzeros Presolve removed 72 rows and 1 columns Presolve time: 0.00s Presolved: 151 rows, 65 columns, 348 nonzeros Variable types: 0 continuous, 65 integer (65 binary) Found heuristic solution: objective 21.0000000 Root relaxation: objective 2.550000e+01, 80 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 21.00000 25.50000 21.4% - 0s 0 0 24.90196 0 55 21.00000 24.90196 18.6% - 0s 0 0 24.83333 0 56 21.00000 24.83333 18.3% - 0s 0 0 24.60606 0 62 21.00000 24.60606 17.2% - 0s H 0 0 22.0000000 24.60606 11.8% - 0s 0 0 24.38298 0 60 22.00000 24.38298 10.8% - 0s 0 0 24.33333 0 50 22.00000 24.33333 10.6% - 0s 0 0 24.29412 0 56 22.00000 24.29412 10.4% - 0s 0 0 24.26984 0 61 22.00000 24.26984 10.3% - 0s 0 0 24.26087 0 61 22.00000 24.26087 10.3% - 0s 0 0 24.26087 0 59 22.00000 24.26087 10.3% - 0s H 0 0 23.0000000 24.26087 5.48% - 0s 0 2 24.25714 0 60 23.00000 24.25714 5.47% - 0s Cutting planes: Gomory: 1 Zero half: 21 Explored 3 nodes (357 simplex iterations) in 0.04 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%