Gurobi 5.0.1 (linux64) logging started Sun Nov 18 05:42:03 2012 Optimize a model with 1 rows, 174 columns and 174 nonzeros Model has 157 quadratic objective terms Presolve removed 0 rows and 22 columns Presolve time: 0.00s Presolved: 158 rows, 309 columns, 623 nonzeros Variable types: 0 continuous, 309 integer (308 binary) Found heuristic solution: objective 40.0000000 Root relaxation: objective 0.000000e+00, 198 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 46 40.00000 0.00000 100% - 0s 0 0 0.00000 0 36 40.00000 0.00000 100% - 0s H 0 0 33.0000000 0.00000 100% - 0s 0 0 0.00000 0 42 33.00000 0.00000 100% - 0s 0 0 0.00000 0 17 33.00000 0.00000 100% - 0s H 0 0 15.0000000 0.00000 100% - 0s H 0 0 13.0000000 0.00000 100% - 0s H 0 0 12.0000000 0.00000 100% - 0s 0 2 0.00000 0 15 12.00000 0.00000 100% - 0s H 29 29 11.0000000 0.00000 100% 1.0 0s H 54 39 10.0000000 0.00000 100% 1.5 0s H 81 56 9.0000000 0.00000 100% 1.5 0s H 108 76 8.0000000 0.00000 100% 2.5 0s H 162 101 7.0000000 0.00000 100% 2.6 0s H 541 229 6.0000000 0.00000 100% 9.0 0s H 561 171 5.0000000 0.00000 100% 10.1 0s H 564 112 4.0000000 0.00000 100% 10.4 0s Cutting planes: Cover: 279 Explored 679 nodes (15695 simplex iterations) in 0.28 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%