Gurobi 5.0.1 (linux64) logging started Sun Nov 18 03:12:27 2012 Optimize a model with 1 rows, 55 columns and 55 nonzeros Model has 77 quadratic objective terms Presolve removed 0 rows and 1 columns Presolve time: 0.00s Presolved: 78 rows, 131 columns, 285 nonzeros Variable types: 0 continuous, 131 integer (130 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 0.000000e+00, 100 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 26 27.00000 0.00000 100% - 0s H 0 0 24.0000000 0.00000 100% - 0s 0 0 0.00000 0 29 24.00000 0.00000 100% - 0s H 0 0 23.0000000 0.00000 100% - 0s 0 0 0.00000 0 23 23.00000 0.00000 100% - 0s H 0 0 18.0000000 0.00000 100% - 0s 0 0 0.00000 0 15 18.00000 0.00000 100% - 0s H 0 0 15.0000000 0.00000 100% - 0s 0 0 0.00000 0 24 15.00000 0.00000 100% - 0s 0 0 0.00000 0 13 15.00000 0.00000 100% - 0s H 0 0 13.0000000 0.00000 100% - 0s 0 2 0.00000 0 13 13.00000 0.00000 100% - 0s H 27 23 12.0000000 0.00000 100% 2.2 0s H 174 92 11.0000000 0.00000 100% 5.9 0s H 268 100 10.0000000 3.00000 70.0% 9.7 0s * 269 87 8 9.0000000 3.00000 66.7% 9.6 0s Cutting planes: Cover: 148 Explored 361 nodes (6323 simplex iterations) in 0.10 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 9.000000000000e+00, best bound 9.000000000000e+00, gap 0.0%