Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:55 2012 Optimize a model with 375 rows, 87 columns and 750 nonzeros Presolve removed 113 rows and 0 columns Presolve time: 0.00s Presolved: 262 rows, 87 columns, 614 nonzeros Variable types: 0 continuous, 87 integer (87 binary) Found heuristic solution: objective 22.0000000 Root relaxation: objective 3.331667e+01, 184 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 33.31667 0 84 22.00000 33.31667 51.4% - 0s H 0 0 27.0000000 33.31667 23.4% - 0s 0 0 32.56522 0 83 27.00000 32.56522 20.6% - 0s 0 0 32.22011 0 86 27.00000 32.22011 19.3% - 0s 0 0 31.85884 0 85 27.00000 31.85884 18.0% - 0s 0 0 31.48071 0 85 27.00000 31.48071 16.6% - 0s 0 0 31.42407 0 87 27.00000 31.42407 16.4% - 0s 0 0 31.40048 0 87 27.00000 31.40048 16.3% - 0s 0 0 31.35532 0 86 27.00000 31.35532 16.1% - 0s 0 0 31.10502 0 83 27.00000 31.10502 15.2% - 0s 0 0 31.04213 0 84 27.00000 31.04213 15.0% - 0s 0 0 30.97851 0 85 27.00000 30.97851 14.7% - 0s 0 0 30.93107 0 85 27.00000 30.93107 14.6% - 0s 0 0 30.93034 0 87 27.00000 30.93034 14.6% - 0s 0 0 30.93034 0 87 27.00000 30.93034 14.6% - 0s 0 2 30.92793 0 87 27.00000 30.92793 14.5% - 0s * 26 7 4 28.0000000 30.60945 9.32% 19.7 0s Cutting planes: Clique: 1 Zero half: 41 Explored 83 nodes (2442 simplex iterations) in 0.12 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%