Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:50:51 2012 Optimize a model with 677 rows, 111 columns and 1354 nonzeros Presolve removed 282 rows and 0 columns Presolve time: 0.00s Presolved: 395 rows, 111 columns, 1039 nonzeros Variable types: 0 continuous, 111 integer (111 binary) Found heuristic solution: objective 25.0000000 Root relaxation: objective 3.727898e+01, 251 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 37.27898 0 108 25.00000 37.27898 49.1% - 0s H 0 0 27.0000000 37.27898 38.1% - 0s 0 0 36.60174 0 108 27.00000 36.60174 35.6% - 0s H 0 0 28.0000000 36.60174 30.7% - 0s 0 0 36.27242 0 106 28.00000 36.27242 29.5% - 0s H 0 0 29.0000000 36.27242 25.1% - 0s 0 0 36.00411 0 107 29.00000 36.00411 24.2% - 0s 0 0 35.89179 0 109 29.00000 35.89179 23.8% - 0s 0 0 35.67331 0 104 29.00000 35.67331 23.0% - 0s 0 0 35.58911 0 104 29.00000 35.58911 22.7% - 0s H 0 0 30.0000000 35.58911 18.6% - 0s 0 0 35.53574 0 107 30.00000 35.53574 18.5% - 0s 0 0 35.48372 0 109 30.00000 35.48372 18.3% - 0s 0 0 35.37314 0 107 30.00000 35.37314 17.9% - 0s 0 0 35.34147 0 108 30.00000 35.34147 17.8% - 0s 0 0 35.31333 0 107 30.00000 35.31333 17.7% - 0s 0 0 35.24829 0 107 30.00000 35.24829 17.5% - 0s 0 0 35.21526 0 108 30.00000 35.21526 17.4% - 0s 0 0 35.21364 0 106 30.00000 35.21364 17.4% - 0s 0 0 35.21364 0 106 30.00000 35.21364 17.4% - 0s 0 2 35.21213 0 106 30.00000 35.21213 17.4% - 0s Cutting planes: Clique: 7 Zero half: 47 Explored 448 nodes (13087 simplex iterations) in 0.56 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.000000000000e+01, best bound 3.000000000000e+01, gap 0.0%