Gurobi 5.0.1 (linux64) logging started Sun Nov 18 07:01:48 2012

Optimize a model with 259 rows, 741 columns and 741 nonzeros
Model has 516 quadratic constraints
Presolve removed 0 rows and 23 columns
Presolve time: 3.01s
Presolved: 259 rows, 718 columns, 718 nonzeros
Variable types: 516 continuous, 202 integer (201 binary)

Root relaxation: objective 0.000000e+00, 83 iterations, 0.00 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

H    0     0                     135.0000000          -     -      -    3s
     0     0    0.00000    0   62  135.00000    0.00000   100%     -    3s
     0     0    0.00000    0  171  135.00000    0.00000   100%     -    3s
     0     0    0.00000    0  171  135.00000    0.00000   100%     -    3s
     0     2    0.00000    0  170  135.00000    0.00000   100%     -    3s
H   46    43                      21.0000000    0.85844  95.9%  43.2    3s
*  431   231              30      20.0000000    4.67643  76.6%  28.3    3s
   607   289    6.23429   10  682   20.00000    6.23429  68.8%  30.5    5s
*  735   349              39      19.0000000    6.23429  67.2%  36.5    5s
* 1900   506              48      18.0000000    9.44898  47.5%  36.4    8s
  2609   637   16.50000   35  434   18.00000   10.88732  39.5%  35.6   10s
  3476   717   15.70285   37  366   18.00000   12.00000  33.3%  34.1   15s
  4785   677   13.30240   34  417   18.00000   13.00000  27.8%  36.2   20s
  6250   491   16.25806   35  391   18.00000   14.09506  21.7%  35.9   25s

Explored 7671 nodes (273420 simplex iterations) in 29.10 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.800000000000e+01, best bound 1.800000000000e+01, gap 0.0%