Gurobi 5.0.1 (linux64) logging started Sun Nov 18 05:41:34 2012 Optimize a model with 1 rows, 173 columns and 173 nonzeros Model has 156 quadratic objective terms Presolve removed 0 rows and 22 columns Presolve time: 0.00s Presolved: 157 rows, 307 columns, 619 nonzeros Variable types: 0 continuous, 307 integer (306 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 0.000000e+00, 195 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 42 47.00000 0.00000 100% - 0s H 0 0 38.0000000 0.00000 100% - 0s 0 0 0.00000 0 34 38.00000 0.00000 100% - 0s H 0 0 27.0000000 0.00000 100% - 0s H 0 0 24.0000000 0.00000 100% - 0s 0 0 0.00000 0 31 24.00000 0.00000 100% - 0s H 0 0 22.0000000 0.00000 100% - 0s H 0 0 21.0000000 0.00000 100% - 0s 0 0 0.00000 0 25 21.00000 0.00000 100% - 0s H 0 0 19.0000000 0.00000 100% - 0s 0 0 0.00000 0 20 19.00000 0.00000 100% - 0s 0 0 0.00000 0 30 19.00000 0.00000 100% - 0s 0 0 0.00000 0 28 19.00000 0.00000 100% - 0s H 0 0 12.0000000 0.00000 100% - 0s H 0 0 7.0000000 0.00000 100% - 0s 0 2 0.00000 0 12 7.00000 0.00000 100% - 0s H 12 12 6.0000000 0.00000 100% 3.4 0s H 150 75 5.0000000 0.00000 100% 2.9 0s * 480 127 8 4.0000000 0.00000 100% 10.2 0s Cutting planes: Cover: 280 Explored 611 nodes (16698 simplex iterations) in 0.29 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%