Gurobi 5.0.1 (linux64) logging started Sun Nov 18 05:41:34 2012 Optimize a model with 1 rows, 173 columns and 173 nonzeros Model has 161 quadratic objective terms Presolve removed 0 rows and 27 columns Presolve time: 0.00s Presolved: 162 rows, 307 columns, 629 nonzeros Variable types: 0 continuous, 307 integer (306 binary) Found heuristic solution: objective 44.0000000 Root relaxation: objective 0.000000e+00, 190 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 44 44.00000 0.00000 100% - 0s 0 0 0.00000 0 31 44.00000 0.00000 100% - 0s H 0 0 27.0000000 0.00000 100% - 0s H 0 0 26.0000000 0.00000 100% - 0s 0 0 0.00000 0 38 26.00000 0.00000 100% - 0s H 0 0 25.0000000 0.00000 100% - 0s 0 0 0.00000 0 37 25.00000 0.00000 100% - 0s 0 0 0.00000 0 25 25.00000 0.00000 100% - 0s 0 0 0.00000 0 27 25.00000 0.00000 100% - 0s 0 0 0.00000 0 27 25.00000 0.00000 100% - 0s H 0 0 19.0000000 0.00000 100% - 0s H 0 0 16.0000000 0.00000 100% - 0s 0 2 0.00000 0 27 16.00000 0.00000 100% - 0s H 108 53 14.0000000 0.00000 100% 3.1 0s H 190 105 13.0000000 0.00000 100% 4.3 0s H 306 162 12.0000000 0.00000 100% 6.4 0s H 319 157 10.0000000 0.00000 100% 6.4 0s H 352 142 9.0000000 0.00000 100% 7.4 0s H 435 142 8.0000000 0.00000 100% 9.3 0s H 516 160 7.0000000 0.58824 91.6% 12.5 0s Cutting planes: Cover: 312 Explored 771 nodes (23302 simplex iterations) in 0.44 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.000000000000e+00, best bound 7.000000000000e+00, gap 0.0%