Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:44 2012 Optimize a model with 242 rows, 71 columns and 484 nonzeros Presolve removed 66 rows and 2 columns Presolve time: 0.00s Presolved: 176 rows, 69 columns, 387 nonzeros Variable types: 0 continuous, 69 integer (69 binary) Found heuristic solution: objective 24.0000000 Root relaxation: objective 3.000000e+01, 93 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 30.00000 0 56 24.00000 30.00000 25.0% - 0s 0 0 29.07407 0 68 24.00000 29.07407 21.1% - 0s 0 0 28.72727 0 69 24.00000 28.72727 19.7% - 0s H 0 0 25.0000000 28.72727 14.9% - 0s 0 0 28.60000 0 64 25.00000 28.60000 14.4% - 0s H 0 0 26.0000000 28.60000 10.0% - 0s 0 0 28.50000 0 69 26.00000 28.50000 9.62% - 0s 0 0 28.30539 0 68 26.00000 28.30539 8.87% - 0s 0 0 28.20408 0 68 26.00000 28.20408 8.48% - 0s 0 0 28.18750 0 62 26.00000 28.18750 8.41% - 0s 0 0 28.17500 0 63 26.00000 28.17500 8.37% - 0s 0 0 28.17500 0 63 26.00000 28.17500 8.37% - 0s 0 2 28.17500 0 63 26.00000 28.17500 8.37% - 0s * 9 2 2 27.0000000 28.03846 3.85% 18.2 0s Cutting planes: Zero half: 27 Explored 12 nodes (558 simplex iterations) in 0.03 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%