Gurobi 5.0.1 (linux64) logging started Sun Nov 18 05:39:58 2012 Optimize a model with 1 rows, 171 columns and 171 nonzeros Model has 133 quadratic objective terms Presolve removed 0 rows and 33 columns Presolve time: 0.00s Presolved: 134 rows, 271 columns, 537 nonzeros Variable types: 0 continuous, 271 integer (270 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 0.000000e+00, 165 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 30 28.00000 0.00000 100% - 0s 0 0 0.00000 0 16 28.00000 0.00000 100% - 0s H 0 0 15.0000000 0.00000 100% - 0s 0 0 0.00000 0 18 15.00000 0.00000 100% - 0s 0 0 0.00000 0 8 15.00000 0.00000 100% - 0s H 0 0 8.0000000 0.00000 100% - 0s 0 0 0.00000 0 12 8.00000 0.00000 100% - 0s 0 0 0.00000 0 12 8.00000 0.00000 100% - 0s H 0 0 6.0000000 0.00000 100% - 0s 0 2 0.00000 0 10 6.00000 0.00000 100% - 0s H 55 30 5.0000000 0.00000 100% 2.8 0s H 246 118 4.0000000 0.00000 100% 4.8 0s H 383 88 3.0000000 0.00000 100% 7.1 0s Cutting planes: Cover: 224 Explored 533 nodes (7948 simplex iterations) in 0.16 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.000000000000e+00, best bound 3.000000000000e+00, gap 0.0%