Gurobi 5.0.1 (linux64) logging started Sun Nov 18 03:12:56 2012 Optimize a model with 1 rows, 57 columns and 57 nonzeros Model has 84 quadratic objective terms Presolve removed 0 rows and 2 columns Presolve time: 0.00s Presolved: 85 rows, 139 columns, 307 nonzeros Variable types: 0 continuous, 139 integer (138 binary) Found heuristic solution: objective 34.0000000 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 27 34.00000 0.00000 100% - 0s H 0 0 24.0000000 0.00000 100% - 0s 0 0 0.00000 0 44 24.00000 0.00000 100% - 0s 0 0 0.00000 0 18 24.00000 0.00000 100% - 0s H 0 0 17.0000000 0.00000 100% - 0s 0 0 0.00000 0 24 17.00000 0.00000 100% - 0s 0 0 0.00000 0 18 17.00000 0.00000 100% - 0s 0 0 0.00000 0 23 17.00000 0.00000 100% - 0s 0 0 0.00000 0 23 17.00000 0.00000 100% - 0s 0 2 0.00000 0 23 17.00000 0.00000 100% - 0s H 108 75 16.0000000 0.00000 100% 3.6 0s * 132 86 23 15.0000000 0.00000 100% 3.5 0s * 230 139 18 14.0000000 0.00000 100% 6.0 0s H 246 123 13.0000000 0.00000 100% 6.3 0s H 273 124 12.0000000 1.00000 91.7% 7.7 0s * 278 109 12 11.0000000 1.00000 90.9% 7.7 0s Cutting planes: Cover: 161 MIR: 8 Zero half: 3 Explored 421 nodes (7236 simplex iterations) in 0.13 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 1.100000000000e+01, best bound 1.100000000000e+01, gap 0.0%