Gurobi 5.0.1 (linux64) logging started Sun Nov 18 09:41:21 2012

Optimize a model with 322 rows, 885 columns and 885 nonzeros
Model has 642 quadratic constraints
Presolve removed 0 rows and 18 columns
Presolve time: 3.74s
Presolved: 322 rows, 867 columns, 867 nonzeros
Variable types: 642 continuous, 225 integer (224 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                     161.0000000          -     -      -    3s
     0     0    0.00000    0   91  161.00000    0.00000   100%     -    3s
     0     0    0.00000    0  122  161.00000    0.00000   100%     -    3s
     0     0    0.00000    0  122  161.00000    0.00000   100%     -    3s
     0     2    0.00000    0  122  161.00000    0.00000   100%     -    3s
H   46    46                      40.0000000    2.16667  94.6%  37.8    4s
*   62    50              41      39.0000000    2.16667  94.4%  31.8    4s
H  131   105                      38.0000000    2.22507  94.1%  26.5    4s
*  138    97              56      37.0000000    2.22507  94.0%  28.2    4s
   603   402   34.66667   20  542   37.00000    5.64347  84.7%  25.4    5s
*  681   431              50      32.0000000    5.64347  82.4%  37.4    5s
H  790   440                      30.0000000    6.37838  78.7%  45.2    6s
  1671   627   16.30622   33  536   30.00000   13.93878  53.5%  46.4   10s
H 2807   758                      29.0000000   16.95181  41.5%  40.6   14s
  2836   765   26.21538   40  440   29.00000   17.00000  41.4%  40.4   15s
  3061   824     cutoff   42        29.00000   17.30435  40.3%  40.2   20s
  3585   965   27.21176   40  433   29.00000   18.09934  37.6%  39.9   25s
* 3936  1009              44      28.0000000   18.38835  34.3%  38.4   26s
  4577  1094   23.31000   36  533   28.00000   19.00000  32.1%  38.0   30s
  5529  1190     cutoff   40        28.00000   19.94253  28.8%  37.2   35s
  6482  1234   25.14286   38  518   28.00000   20.57692  26.5%  35.8   40s
  7728  1195   26.10638   38  512   28.00000   21.34884  23.8%  34.8   45s
  9163  1087   24.90503   38  518   28.00000   22.00000  21.4%  33.9   50s
 10405   983   24.65957   39  500   28.00000   22.50000  19.6%  33.6   55s
 11726   820   25.35955   38  479   28.00000   23.03540  17.7%  33.8   60s
 13366   548   26.50000   40  510   28.00000   24.00000  14.3%  33.2   65s

Explored 14728 nodes (488722 simplex iterations) in 68.46 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.800000000000e+01, best bound 2.800000000000e+01, gap 0.0%