Gurobi 5.0.1 (linux64) logging started Sun Nov 18 03:12:41 2012 Optimize a model with 1 rows, 56 columns and 56 nonzeros Model has 89 quadratic objective terms Presolve removed 0 rows and 2 columns Presolve time: 0.00s Presolved: 90 rows, 143 columns, 321 nonzeros Variable types: 0 continuous, 143 integer (142 binary) Found heuristic solution: objective 31.0000000 Root relaxation: objective 0.000000e+00, 116 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 31.00000 0.00000 100% - 0s H 0 0 20.0000000 0.00000 100% - 0s 0 0 0.00000 0 26 20.00000 0.00000 100% - 0s H 0 0 17.0000000 0.00000 100% - 0s 0 0 0.00000 0 50 17.00000 0.00000 100% - 0s 0 0 0.00000 0 45 17.00000 0.00000 100% - 0s H 0 0 16.0000000 0.00000 100% - 0s H 0 0 14.0000000 0.00000 100% - 0s 0 2 0.00000 0 26 14.00000 0.00000 100% - 0s H 245 125 13.0000000 1.00000 92.3% 10.4 0s H 249 108 12.0000000 1.00000 91.7% 10.7 0s H 256 103 11.0000000 1.00000 90.9% 10.8 0s Cutting planes: Cover: 166 Explored 429 nodes (7814 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%