Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:44 2012 Optimize a model with 249 rows, 72 columns and 498 nonzeros Presolve removed 58 rows and 0 columns Presolve time: 0.00s Presolved: 191 rows, 72 columns, 426 nonzeros Variable types: 0 continuous, 72 integer (72 binary) Found heuristic solution: objective 24.0000000 Root relaxation: objective 3.000000e+01, 90 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 50 24.00000 30.00000 25.0% - 0s H 0 0 25.0000000 30.00000 20.0% - 0s 0 0 29.16667 0 63 25.00000 29.16667 16.7% - 0s 0 0 28.75000 0 66 25.00000 28.75000 15.0% - 0s 0 0 28.55556 0 64 25.00000 28.55556 14.2% - 0s 0 0 28.45161 0 65 25.00000 28.45161 13.8% - 0s 0 0 28.40856 0 67 25.00000 28.40856 13.6% - 0s H 0 0 26.0000000 28.40856 9.26% - 0s 0 0 28.33333 0 59 26.00000 28.33333 8.97% - 0s 0 0 28.28125 0 66 26.00000 28.28125 8.77% - 0s 0 0 28.27193 0 67 26.00000 28.27193 8.74% - 0s 0 0 28.27193 0 65 26.00000 28.27193 8.74% - 0s 0 2 28.25000 0 65 26.00000 28.25000 8.65% - 0s * 3 3 3 27.0000000 28.00000 3.70% 14.3 0s Cutting planes: Zero half: 29 Explored 9 nodes (444 simplex iterations) in 0.04 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%