Gurobi 5.0.1 (linux64) logging started Sun Nov 18 06:55:55 2012

Optimize a model with 272 rows, 765 columns and 765 nonzeros
Model has 542 quadratic constraints
Presolve removed 0 rows and 16 columns
Presolve time: 3.15s
Presolved: 272 rows, 749 columns, 749 nonzeros
Variable types: 542 continuous, 207 integer (206 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                     151.0000000          -     -      -    3s
     0     0    0.00000    0    2  151.00000    0.00000   100%     -    3s
     0     0    0.00000    0  123  151.00000    0.00000   100%     -    3s
     0     0    0.00000    0  158  151.00000    0.00000   100%     -    3s
     0     2    0.00000    0  156  151.00000    0.00000   100%     -    3s
H   43    43                      28.0000000    1.78261  93.6%  48.7    3s
H  129    69                      21.0000000    4.00000  81.0%  33.9    3s
*  130    68              17      20.0000000    4.00000  80.0%  34.0    3s
   606   208    8.75000   14  432   20.00000    8.75000  56.2%  34.4    5s
*  749   271              33      19.0000000    8.75000  53.9%  42.0    5s
H  777   243                      18.0000000    8.75000  51.4%  41.4    5s
  1786   495     cutoff   24        18.00000    8.88889  50.6%  58.8   10s
  2585   526   15.64088   40  445   18.00000    9.67665  46.2%  54.0   15s
  3923   255   15.45984   37  407   18.00000   13.00000  27.8%  46.6   20s
  4453   173   16.00000   37  397   18.00000   14.00000  22.2%  45.6   25s

Explored 4959 nodes (223713 simplex iterations) in 26.75 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%