Gurobi 5.0.1 (linux64) logging started Sun Nov 18 05:28:16 2012 Optimize a model with 1 rows, 155 columns and 155 nonzeros Model has 126 quadratic objective terms Presolve removed 0 rows and 31 columns Presolve time: 0.00s Presolved: 127 rows, 250 columns, 502 nonzeros Variable types: 0 continuous, 250 integer (249 binary) Found heuristic solution: objective 31.0000000 Root relaxation: objective 0.000000e+00, 151 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 29 31.00000 0.00000 100% - 0s H 0 0 25.0000000 0.00000 100% - 0s 0 0 0.00000 0 28 25.00000 0.00000 100% - 0s H 0 0 18.0000000 0.00000 100% - 0s 0 0 0.00000 0 22 18.00000 0.00000 100% - 0s 0 0 0.00000 0 25 18.00000 0.00000 100% - 0s 0 0 0.00000 0 15 18.00000 0.00000 100% - 0s H 0 0 11.0000000 0.00000 100% - 0s 0 0 0.00000 0 11 11.00000 0.00000 100% - 0s H 0 0 9.0000000 0.00000 100% - 0s 0 0 0.00000 0 18 9.00000 0.00000 100% - 0s 0 0 0.00000 0 16 9.00000 0.00000 100% - 0s 0 2 0.00000 0 16 9.00000 0.00000 100% - 0s H 27 24 8.0000000 0.00000 100% 1.6 0s H 109 31 5.0000000 0.00000 100% 2.1 0s * 480 136 17 4.0000000 0.00000 100% 10.0 0s Cutting planes: Cover: 225 Explored 631 nodes (14404 simplex iterations) in 0.24 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%