Gurobi 5.0.1 (linux64) logging started Sun Nov 18 05:33:33 2012 Optimize a model with 1 rows, 160 columns and 160 nonzeros Model has 145 quadratic objective terms Presolve removed 0 rows and 27 columns Presolve time: 0.00s Presolved: 146 rows, 278 columns, 568 nonzeros Variable types: 0 continuous, 278 integer (277 binary) Found heuristic solution: objective 40.0000000 Root relaxation: objective 0.000000e+00, 178 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 41 40.00000 0.00000 100% - 0s 0 0 0.00000 0 29 40.00000 0.00000 100% - 0s H 0 0 26.0000000 0.00000 100% - 0s 0 0 0.00000 0 40 26.00000 0.00000 100% - 0s H 0 0 25.0000000 0.00000 100% - 0s 0 0 0.00000 0 17 25.00000 0.00000 100% - 0s H 0 0 15.0000000 0.00000 100% - 0s 0 0 0.00000 0 19 15.00000 0.00000 100% - 0s H 0 0 12.0000000 0.00000 100% - 0s 0 0 0.00000 0 21 12.00000 0.00000 100% - 0s 0 0 0.00000 0 18 12.00000 0.00000 100% - 0s 0 0 0.00000 0 20 12.00000 0.00000 100% - 0s 0 0 0.00000 0 20 12.00000 0.00000 100% - 0s 0 2 0.00000 0 20 12.00000 0.00000 100% - 0s H 27 27 10.0000000 0.00000 100% 1.7 0s H 300 161 9.0000000 0.00000 100% 4.9 0s H 409 199 8.0000000 0.00000 100% 6.5 0s H 490 160 6.0000000 0.00000 100% 8.0 0s Cutting planes: Cover: 269 Explored 725 nodes (21603 simplex iterations) in 0.41 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.000000000000e+00, best bound 6.000000000000e+00, gap 0.0%