Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:00 2012 Optimize a model with 397 rows, 91 columns and 794 nonzeros Presolve removed 135 rows and 0 columns Presolve time: 0.00s Presolved: 262 rows, 91 columns, 630 nonzeros Variable types: 0 continuous, 91 integer (91 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 3.455056e+01, 159 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 34.55056 0 86 28.00000 34.55056 23.4% - 0s H 0 0 30.0000000 34.55056 15.2% - 0s 0 0 33.98585 0 90 30.00000 33.98585 13.3% - 0s 0 0 33.82500 0 89 30.00000 33.82500 12.7% - 0s H 0 0 31.0000000 33.82500 9.11% - 0s 0 0 33.56479 0 88 31.00000 33.56479 8.27% - 0s 0 0 33.50063 0 90 31.00000 33.50063 8.07% - 0s 0 0 33.37233 0 90 31.00000 33.37233 7.65% - 0s 0 0 33.29868 0 90 31.00000 33.29868 7.42% - 0s 0 0 33.28823 0 90 31.00000 33.28823 7.38% - 0s 0 0 33.28823 0 90 31.00000 33.28823 7.38% - 0s 0 2 33.28354 0 90 31.00000 33.28354 7.37% - 0s Cutting planes: Clique: 1 Zero half: 29 Explored 16 nodes (1109 simplex iterations) in 0.08 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%