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 86 quadratic objective terms Presolve removed 0 rows and 2 columns Presolve time: 0.00s Presolved: 87 rows, 139 columns, 311 nonzeros Variable types: 0 continuous, 139 integer (138 binary) Found heuristic solution: objective 35.0000000 Root relaxation: objective 0.000000e+00, 109 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 32 35.00000 0.00000 100% - 0s H 0 0 29.0000000 0.00000 100% - 0s 0 0 0.00000 0 27 29.00000 0.00000 100% - 0s H 0 0 23.0000000 0.00000 100% - 0s 0 0 0.00000 0 33 23.00000 0.00000 100% - 0s 0 0 0.00000 0 23 23.00000 0.00000 100% - 0s H 0 0 17.0000000 0.00000 100% - 0s 0 0 0.00000 0 33 17.00000 0.00000 100% - 0s 0 0 0.00000 0 31 17.00000 0.00000 100% - 0s 0 0 0.00000 0 24 17.00000 0.00000 100% - 0s 0 0 0.00000 0 26 17.00000 0.00000 100% - 0s 0 0 0.00000 0 26 17.00000 0.00000 100% - 0s 0 2 0.00000 0 26 17.00000 0.00000 100% - 0s H 110 84 16.0000000 0.00000 100% 4.3 0s H 529 143 15.0000000 4.60000 69.3% 15.2 0s * 580 128 15 14.0000000 5.89655 57.9% 16.4 0s * 623 88 11 13.0000000 7.13333 45.1% 17.0 0s Cutting planes: Cover: 164 Explored 751 nodes (12856 simplex iterations) in 0.24 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.300000000000e+01, best bound 1.300000000000e+01, gap 0.0%