Gurobi 5.0.1 (linux64) logging started Sun Nov 18 03:12:14 2012 Optimize a model with 1 rows, 54 columns and 54 nonzeros Model has 71 quadratic objective terms Presolve removed 0 rows and 1 columns Presolve time: 0.00s Presolved: 72 rows, 124 columns, 266 nonzeros Variable types: 0 continuous, 124 integer (123 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 0.000000e+00, 98 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 23 27.00000 0.00000 100% - 0s H 0 0 21.0000000 0.00000 100% - 0s 0 0 0.00000 0 25 21.00000 0.00000 100% - 0s H 0 0 15.0000000 0.00000 100% - 0s H 0 0 13.0000000 0.00000 100% - 0s 0 0 0.00000 0 17 13.00000 0.00000 100% - 0s 0 0 0.00000 0 13 13.00000 0.00000 100% - 0s 0 0 0.00000 0 20 13.00000 0.00000 100% - 0s 0 0 0.00000 0 20 13.00000 0.00000 100% - 0s 0 2 0.00000 0 19 13.00000 0.00000 100% - 0s H 172 108 12.0000000 0.00000 100% 5.2 0s H 176 97 11.0000000 0.00000 100% 5.1 0s H 254 109 10.0000000 1.00000 90.0% 8.0 0s * 255 90 11 9.0000000 1.00000 88.9% 7.9 0s * 286 64 12 8.0000000 1.00000 87.5% 9.9 0s Cutting planes: Cover: 136 MIR: 1 Explored 360 nodes (5892 simplex iterations) in 0.10 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.000000000000e+00, best bound 8.000000000000e+00, gap 0.0%