Gurobi 5.0.1 (linux64) logging started Sun Nov 18 05:43:47 2012 Optimize a model with 1 rows, 176 columns and 176 nonzeros Model has 163 quadratic objective terms Presolve removed 0 rows and 27 columns Presolve time: 0.00s Presolved: 164 rows, 312 columns, 638 nonzeros Variable types: 0 continuous, 312 integer (311 binary) Found heuristic solution: objective 53.0000000 Root relaxation: objective 0.000000e+00, 211 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 33 53.00000 0.00000 100% - 0s H 0 0 30.0000000 0.00000 100% - 0s 0 0 0.00000 0 31 30.00000 0.00000 100% - 0s H 0 0 27.0000000 0.00000 100% - 0s 0 0 0.00000 0 36 27.00000 0.00000 100% - 0s H 0 0 21.0000000 0.00000 100% - 0s 0 0 0.00000 0 16 21.00000 0.00000 100% - 0s H 0 0 16.0000000 0.00000 100% - 0s H 0 0 15.0000000 0.00000 100% - 0s 0 0 0.00000 0 21 15.00000 0.00000 100% - 0s H 0 0 9.0000000 0.00000 100% - 0s 0 0 0.00000 0 20 9.00000 0.00000 100% - 0s 0 0 0.00000 0 22 9.00000 0.00000 100% - 0s 0 0 0.00000 0 22 9.00000 0.00000 100% - 0s 0 2 0.00000 0 22 9.00000 0.00000 100% - 0s H 454 273 8.0000000 0.00000 100% 8.9 0s * 534 249 21 7.0000000 0.00000 100% 10.6 0s H 913 111 6.0000000 3.15385 47.4% 28.9 0s Cutting planes: Cover: 316 Explored 1028 nodes (30761 simplex iterations) in 0.68 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%