Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:45 2012 Optimize a model with 235 rows, 73 columns and 470 nonzeros Presolve removed 61 rows and 0 columns Presolve time: 0.00s Presolved: 174 rows, 73 columns, 388 nonzeros Variable types: 0 continuous, 73 integer (73 binary) Found heuristic solution: objective 26.0000000 Root relaxation: objective 3.100000e+01, 105 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 31.00000 0 44 26.00000 31.00000 19.2% - 0s H 0 0 27.0000000 31.00000 14.8% - 0s 0 0 30.38462 0 68 27.00000 30.38462 12.5% - 0s 0 0 29.71875 0 71 27.00000 29.71875 10.1% - 0s H 0 0 28.0000000 29.71875 6.14% - 0s 0 0 29.56291 0 72 28.00000 29.56291 5.58% - 0s 0 0 29.36306 0 72 28.00000 29.36306 4.87% - 0s 0 0 29.23485 0 72 28.00000 29.23485 4.41% - 0s 0 0 29.18293 0 72 28.00000 29.18293 4.22% - 0s 0 0 29.12500 0 72 28.00000 29.12500 4.02% - 0s 0 0 cutoff 0 28.00000 28.99997 3.57% - 0s Cutting planes: Clique: 2 Zero half: 34 Explored 0 nodes (376 simplex iterations) in 0.02 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%