Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:51 2012 Optimize a model with 346 rows, 83 columns and 692 nonzeros Presolve removed 133 rows and 2 columns Presolve time: 0.00s Presolved: 213 rows, 81 columns, 511 nonzeros Variable types: 0 continuous, 81 integer (81 binary) Found heuristic solution: objective 23.0000000 Root relaxation: objective 3.109231e+01, 157 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 31.09231 0 81 23.00000 31.09231 35.2% - 0s H 0 0 25.0000000 31.09231 24.4% - 0s 0 0 30.72139 0 80 25.00000 30.72139 22.9% - 0s 0 0 30.56163 0 80 25.00000 30.56163 22.2% - 0s 0 0 30.47282 0 81 25.00000 30.47282 21.9% - 0s 0 0 30.32885 0 81 25.00000 30.32885 21.3% - 0s H 0 0 26.0000000 30.32885 16.6% - 0s 0 0 30.22222 0 77 26.00000 30.22222 16.2% - 0s H 0 0 27.0000000 30.22222 11.9% - 0s 0 0 30.09333 0 78 27.00000 30.09333 11.5% - 0s 0 0 29.96259 0 81 27.00000 29.96259 11.0% - 0s 0 0 29.94146 0 80 27.00000 29.94146 10.9% - 0s 0 0 29.87570 0 77 27.00000 29.87570 10.7% - 0s 0 0 29.85542 0 80 27.00000 29.85542 10.6% - 0s 0 0 29.84031 0 77 27.00000 29.84031 10.5% - 0s 0 0 29.79460 0 80 27.00000 29.79460 10.4% - 0s 0 0 29.79134 0 80 27.00000 29.79134 10.3% - 0s 0 0 29.79134 0 78 27.00000 29.79134 10.3% - 0s 0 2 29.78569 0 78 27.00000 29.78569 10.3% - 0s H 4 4 28.0000000 29.78569 6.38% 40.8 0s Cutting planes: Zero half: 29 Explored 25 nodes (1084 simplex iterations) in 0.08 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.800000000000e+01, best bound 2.800000000000e+01, gap 0.0%