Gurobi 5.0.1 (linux64) logging started Sun Nov 18 08:22:43 2012

Optimize a model with 273 rows, 780 columns and 780 nonzeros
Model has 544 quadratic constraints
Presolve removed 0 rows and 21 columns
Presolve time: 3.22s
Presolved: 273 rows, 759 columns, 759 nonzeros
Variable types: 544 continuous, 215 integer (214 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                     129.0000000          -     -      -    3s
     0     0    0.00000    0    2  129.00000    0.00000   100%     -    3s
     0     0    0.00000    0  139  129.00000    0.00000   100%     -    3s
     0     0    0.00000    0  137  129.00000    0.00000   100%     -    3s
     0     2    0.00000    0  134  129.00000    0.00000   100%     -    3s
H   47    47                      23.0000000    3.05625  86.7%  34.1    3s
   606   360    8.00000   14  464   23.00000    8.00000  65.2%  23.4    5s
*  655   371              38      21.0000000    8.00000  61.9%  29.0    5s
  2045   507   13.00000   33  461   21.00000   11.00000  47.6%  37.2   10s
  2984   696   16.77848   36  398   21.00000   12.79570  39.1%  35.5   15s
  4233   847   19.42742   38  406   21.00000   14.00000  33.3%  32.7   20s
* 5766   830              49      20.0000000   15.19749  24.0%  31.5   24s
  5773   828   18.28261   35  432   20.00000   15.20139  24.0%  31.5   25s
  7072   584   18.27389   39  387   20.00000   16.40351  18.0%  30.9   30s

Explored 8297 nodes (257518 simplex iterations) in 34.63 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.000000000000e+01, best bound 2.000000000000e+01, gap 0.0%