Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:51:00 2012 Optimize a model with 624 rows, 112 columns and 1248 nonzeros Presolve removed 224 rows and 0 columns Presolve time: 0.00s Presolved: 400 rows, 112 columns, 987 nonzeros Variable types: 0 continuous, 112 integer (112 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 3.958333e+01, 226 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 39.58333 0 107 28.00000 39.58333 41.4% - 0s H 0 0 29.0000000 39.58333 36.5% - 0s 0 0 39.02699 0 111 29.00000 39.02699 34.6% - 0s 0 0 38.76970 0 112 29.00000 38.76970 33.7% - 0s 0 0 38.66649 0 112 29.00000 38.66649 33.3% - 0s H 0 0 31.0000000 38.66649 24.7% - 0s 0 0 38.61603 0 111 31.00000 38.61603 24.6% - 0s 0 0 38.47787 0 112 31.00000 38.47787 24.1% - 0s 0 0 38.36100 0 112 31.00000 38.36100 23.7% - 0s 0 0 38.31553 0 112 31.00000 38.31553 23.6% - 0s 0 0 38.22151 0 111 31.00000 38.22151 23.3% - 0s 0 0 38.04986 0 112 31.00000 38.04986 22.7% - 0s 0 0 37.95380 0 111 31.00000 37.95380 22.4% - 0s 0 0 37.92341 0 111 31.00000 37.92341 22.3% - 0s 0 0 37.86810 0 111 31.00000 37.86810 22.2% - 0s H 0 0 32.0000000 37.86810 18.3% - 0s 0 0 37.81603 0 111 32.00000 37.81603 18.2% - 0s 0 0 37.79758 0 109 32.00000 37.79758 18.1% - 0s 0 0 37.77789 0 112 32.00000 37.77789 18.1% - 0s 0 0 37.68432 0 110 32.00000 37.68432 17.8% - 0s 0 0 37.68181 0 110 32.00000 37.68181 17.8% - 0s 0 0 37.68181 0 110 32.00000 37.68181 17.8% - 0s 0 2 37.68067 0 110 32.00000 37.68067 17.8% - 0s * 203 31 9 33.0000000 35.93950 8.91% 31.3 0s Cutting planes: Clique: 3 Zero half: 55 Explored 348 nodes (10926 simplex iterations) in 0.48 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.300000000000e+01, best bound 3.300000000000e+01, gap 0.0%