Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:43 2012 Optimize a model with 262 rows, 69 columns and 524 nonzeros Presolve removed 83 rows and 0 columns Presolve time: 0.00s Presolved: 179 rows, 69 columns, 422 nonzeros Variable types: 0 continuous, 69 integer (69 binary) Found heuristic solution: objective 19.0000000 Root relaxation: objective 2.664286e+01, 124 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 26.64286 0 62 19.00000 26.64286 40.2% - 0s H 0 0 23.0000000 26.64286 15.8% - 0s 0 0 26.03361 0 65 23.00000 26.03361 13.2% - 0s 0 0 25.58333 0 62 23.00000 25.58333 11.2% - 0s 0 0 25.30882 0 66 23.00000 25.30882 10.0% - 0s 0 0 25.00000 0 64 23.00000 25.00000 8.70% - 0s 0 0 24.83051 0 68 23.00000 24.83051 7.96% - 0s 0 0 24.72165 0 67 23.00000 24.72165 7.49% - 0s 0 0 24.65164 0 67 23.00000 24.65164 7.18% - 0s 0 0 24.60787 0 67 23.00000 24.60787 6.99% - 0s 0 0 24.59217 0 67 23.00000 24.59217 6.92% - 0s 0 0 24.59217 0 66 23.00000 24.59217 6.92% - 0s 0 2 24.57627 0 66 23.00000 24.57627 6.85% - 0s Cutting planes: Zero half: 33 Explored 7 nodes (571 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%