Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:45 2012 Optimize a model with 536 rows, 105 columns and 1072 nonzeros Presolve removed 205 rows and 3 columns Presolve time: 0.00s Presolved: 331 rows, 102 columns, 815 nonzeros Variable types: 0 continuous, 102 integer (102 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 3.762500e+01, 196 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 37.62500 0 98 28.00000 37.62500 34.4% - 0s 0 0 37.36399 0 100 28.00000 37.36399 33.4% - 0s 0 0 37.03121 0 101 28.00000 37.03121 32.3% - 0s 0 0 36.73995 0 99 28.00000 36.73995 31.2% - 0s 0 0 36.55542 0 100 28.00000 36.55542 30.6% - 0s 0 0 36.37192 0 101 28.00000 36.37192 29.9% - 0s 0 0 36.20122 0 100 28.00000 36.20122 29.3% - 0s H 0 0 29.0000000 36.20122 24.8% - 0s 0 0 36.06248 0 100 29.00000 36.06248 24.4% - 0s 0 0 35.93279 0 99 29.00000 35.93279 23.9% - 0s H 0 0 30.0000000 35.93279 19.8% - 0s 0 0 35.91151 0 99 30.00000 35.91151 19.7% - 0s 0 0 35.86741 0 101 30.00000 35.86741 19.6% - 0s 0 0 35.83980 0 100 30.00000 35.83980 19.5% - 0s 0 0 35.81744 0 100 30.00000 35.81744 19.4% - 0s H 0 0 31.0000000 35.81744 15.5% - 0s 0 0 35.77572 0 100 31.00000 35.77572 15.4% - 0s 0 0 35.74264 0 101 31.00000 35.74264 15.3% - 0s 0 0 35.71938 0 101 31.00000 35.71938 15.2% - 0s 0 0 35.70903 0 102 31.00000 35.70903 15.2% - 0s 0 0 35.70903 0 100 31.00000 35.70903 15.2% - 0s 0 2 35.70635 0 100 31.00000 35.70635 15.2% - 0s Cutting planes: Clique: 1 Zero half: 65 Explored 411 nodes (10250 simplex iterations) in 0.40 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%