Gurobi 5.0.1 (linux64) logging started Sun Nov 18 03:09:23 2012 Optimize a model with 1 rows, 31 columns and 31 nonzeros Model has 31 quadratic objective terms Presolve removed 0 rows and 2 columns Presolve time: 0.00s Presolved: 32 rows, 60 columns, 122 nonzeros Variable types: 0 continuous, 60 integer (59 binary) Found heuristic solution: objective 10.0000000 Root relaxation: objective 0.000000e+00, 36 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 10 10.00000 0.00000 100% - 0s H 0 0 7.0000000 0.00000 100% - 0s 0 0 0.00000 0 11 7.00000 0.00000 100% - 0s 0 0 0.00000 0 6 7.00000 0.00000 100% - 0s H 0 0 6.0000000 0.00000 100% - 0s H 0 0 5.0000000 0.00000 100% - 0s 0 0 0.00000 0 4 5.00000 0.00000 100% - 0s H 0 0 4.0000000 0.00000 100% - 0s 0 0 0.00000 0 6 4.00000 0.00000 100% - 0s 0 0 0.00000 0 4 4.00000 0.00000 100% - 0s H 0 0 3.0000000 0.00000 100% - 0s 0 2 0.00000 0 4 3.00000 0.00000 100% - 0s H 81 6 2.0000000 0.00000 100% 4.5 0s Cutting planes: Cover: 48 Explored 88 nodes (582 simplex iterations) in 0.02 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.000000000000e+00, best bound 2.000000000000e+00, gap 0.0%