Gurobi 5.0.1 (linux64) logging started Sun Nov 18 06:38:29 2012

Optimize a model with 272 rows, 761 columns and 761 nonzeros
Model has 542 quadratic constraints
Presolve removed 0 rows and 20 columns
Presolve time: 3.17s
Presolved: 272 rows, 741 columns, 741 nonzeros
Variable types: 542 continuous, 199 integer (198 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                     126.0000000          -     -      -    3s
     0     0    0.00000    0   61  126.00000    0.00000   100%     -    3s
     0     0    0.00000    0   61  126.00000    0.00000   100%     -    3s
     0     0    0.00000    0  140  126.00000    0.00000   100%     -    3s
     0     2    0.00000    0  137  126.00000    0.00000   100%     -    3s
H   45    45                      30.0000000    1.91110  93.6%  34.4    3s
*   54    52              36      29.0000000    1.91110  93.4%  32.9    3s
H  218   178                      28.0000000    3.53847  87.4%  25.4    3s
H  243   165                      26.0000000    3.59091  86.2%  26.1    3s
H  248   140                      24.0000000    3.59091  85.0%  26.9    3s
*  249   127              25      23.0000000    3.59091  84.4%  26.8    3s
   606   251    8.05263   14  455   23.00000    8.05263  65.0%  31.7    5s
  2601   934   16.32558   37  431   23.00000   11.80682  48.7%  31.9   10s
  5125  1772   19.00000   38  452   23.00000   14.00000  39.1%  29.2   15s
  7626  2292   22.88655   39  412   23.00000   15.30769  33.4%  28.3   20s
 10143  2688   20.17791   36  441   23.00000   16.18966  29.6%  28.0   25s
 12681  2943   22.54605   41  398   23.00000   16.88821  26.6%  27.8   30s
 15352  3123   20.00000   36  419   23.00000   17.39048  24.4%  27.3   35s
 17994  3153     cutoff   42        23.00000   17.97727  21.8%  27.0   40s
 20695  3129   22.51163   43  340   23.00000   18.36879  20.1%  26.9   45s
 23544  3033   20.46875   40  378   23.00000   18.80263  18.2%  26.4   50s
 26115  2865   22.79730   44  382   23.00000   19.11111  16.9%  26.8   55s
 29145  2564   21.60000   40  413   23.00000   19.55814  15.0%  26.3   60s
 32036  2208   21.03226   42  408   23.00000   20.00000  13.0%  26.2   65s
 35126  1596   22.06667   42  369   23.00000   20.58333  10.5%  25.9   70s
*36671    55              41      22.0000000   21.00000  4.55%  25.8   72s

Explored 36729 nodes (949196 simplex iterations) in 72.60 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.200000000008e+01, best bound 2.200000000008e+01, gap 0.0%