Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:58 2012 Optimize a model with 631 rows, 107 columns and 1262 nonzeros Presolve removed 242 rows and 0 columns Presolve time: 0.00s Presolved: 389 rows, 107 columns, 997 nonzeros Variable types: 0 continuous, 107 integer (107 binary) Found heuristic solution: objective 24.0000000 Root relaxation: objective 3.564235e+01, 257 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 35.64235 0 101 24.00000 35.64235 48.5% - 0s H 0 0 27.0000000 35.64235 32.0% - 0s 0 0 35.27539 0 104 27.00000 35.27539 30.6% - 0s 0 0 35.20821 0 105 27.00000 35.20821 30.4% - 0s 0 0 35.13456 0 102 27.00000 35.13456 30.1% - 0s 0 0 35.08270 0 105 27.00000 35.08270 29.9% - 0s 0 0 35.05313 0 106 27.00000 35.05313 29.8% - 0s 0 0 35.02838 0 104 27.00000 35.02838 29.7% - 0s 0 0 34.87485 0 103 27.00000 34.87485 29.2% - 0s H 0 0 28.0000000 34.87485 24.6% - 0s 0 0 34.81833 0 104 28.00000 34.81833 24.4% - 0s 0 0 34.77290 0 104 28.00000 34.77290 24.2% - 0s 0 0 34.77006 0 104 28.00000 34.77006 24.2% - 0s 0 0 34.77006 0 104 28.00000 34.77006 24.2% - 0s 0 2 34.76979 0 104 28.00000 34.76979 24.2% - 0s * 11 11 7 30.0000000 34.68566 15.6% 35.3 0s * 179 14 8 31.0000000 32.56140 5.04% 28.9 0s Cutting planes: Gomory: 1 Clique: 6 Zero half: 30 Explored 195 nodes (6140 simplex iterations) in 0.29 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%