Gurobi 5.0.1 (linux64) logging started Sat Nov 17 23:37:54 2012

Optimize a model with 1 rows, 22 columns and 22 nonzeros
Model has 29 quadratic objective terms
Presolve time: 0.00s
Presolved: 30 rows, 51 columns, 109 nonzeros
Variable types: 0 continuous, 51 integer (51 binary)
Found heuristic solution: objective 12.0000000

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    9   12.00000    0.00000   100%     -    0s
H    0     0                       7.0000000    0.00000   100%     -    0s
     0     0    0.00000    0   10    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
     0     0    0.00000    0    9    6.00000    0.00000   100%     -    0s
     0     0    0.00000    0    7    6.00000    0.00000   100%     -    0s
     0     0    0.00000    0    7    6.00000    0.00000   100%     -    0s
     0     0    0.00000    0    7    6.00000    0.00000   100%     -    0s
     0     2    0.00000    0    7    6.00000    0.00000   100%     -    0s
H   48    19                       5.0000000    0.00000   100%   2.8    0s
*   62    24              12       4.0000000    0.00000   100%   2.8    0s

Cutting planes:
  Cover: 50

Explored 115 nodes (711 simplex iterations) in 0.02 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%