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 73 quadratic objective terms Presolve removed 0 rows and 5 columns Presolve time: 0.00s Presolved: 74 rows, 124 columns, 270 nonzeros Variable types: 0 continuous, 124 integer (123 binary) Found heuristic solution: objective 24.0000000 Root relaxation: objective 0.000000e+00, 90 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 23 24.00000 0.00000 100% - 0s H 0 0 18.0000000 0.00000 100% - 0s 0 0 0.00000 0 34 18.00000 0.00000 100% - 0s H 0 0 13.0000000 0.00000 100% - 0s 0 0 0.00000 0 18 13.00000 0.00000 100% - 0s 0 0 0.00000 0 19 13.00000 0.00000 100% - 0s 0 0 0.00000 0 19 13.00000 0.00000 100% - 0s 0 2 0.00000 0 19 13.00000 0.00000 100% - 0s H 136 92 12.0000000 0.00000 100% 4.9 0s * 234 110 13 10.0000000 1.00000 90.0% 6.5 0s * 260 98 7 9.0000000 1.00000 88.9% 9.2 0s * 275 79 18 8.0000000 1.00000 87.5% 9.9 0s Cutting planes: Cover: 141 MIR: 2 Zero half: 2 Explored 379 nodes (5981 simplex iterations) in 0.09 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 8.000000000000e+00, best bound 8.000000000000e+00, gap 0.0%