Gurobi 5.0.1 (linux64) logging started Sun Nov 18 06:51:58 2012

Optimize a model with 271 rows, 762 columns and 762 nonzeros
Model has 540 quadratic constraints
Presolve removed 0 rows and 13 columns
Presolve time: 3.15s
Presolved: 271 rows, 749 columns, 749 nonzeros
Variable types: 540 continuous, 209 integer (208 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                     139.0000000          -     -      -    3s
     0     0    0.00000    0    2  139.00000    0.00000   100%     -    3s
     0     0    0.00000    0    2  139.00000    0.00000   100%     -    3s
     0     0    0.00000    0  109  139.00000    0.00000   100%     -    3s
     0     2    0.00000    0  107  139.00000    0.00000   100%     -    3s
H   54    54                      33.0000000    2.66667  91.9%  40.9    3s
H   81    73                      24.0000000    2.66667  88.9%  35.5    3s
*   92    54              70      23.0000000    2.66667  88.4%  31.5    3s
*  552   312              29      22.0000000    7.25000  67.0%  22.2    3s
   706   397    8.31646   15  466   22.00000    8.31646  62.2%  24.8    5s
*  938   461              43      19.0000000    8.31646  56.2%  39.2    6s
  2475   301     cutoff   36        19.00000   12.73333  33.0%  36.4   10s
  3311   222   17.32824   41  324   19.00000   14.15000  25.5%  36.6   15s

Explored 4016 nodes (145658 simplex iterations) in 18.19 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.900000000000e+01, best bound 1.900000000000e+01, gap 0.0%