Gurobi 5.0.1 (linux64) logging started Sun Nov 18 06:19:09 2012

Optimize a model with 251 rows, 712 columns and 712 nonzeros
Model has 500 quadratic constraints
Presolve removed 0 rows and 18 columns
Presolve time: 2.92s
Presolved: 251 rows, 694 columns, 694 nonzeros
Variable types: 500 continuous, 194 integer (193 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                     117.0000000          -     -      -    2s
     0     0    0.00000    0   67  117.00000    0.00000   100%     -    2s
     0     0    0.00000    0   15  117.00000    0.00000   100%     -    2s
     0     0    0.00000    0  142  117.00000    0.00000   100%     -    2s
     0     2    0.00000    0  142  117.00000    0.00000   100%     -    3s
H   40    40                      28.0000000    2.88000  89.7%  40.2    3s
*   52    51              33      24.0000000    2.88000  88.0%  39.2    3s
H  191   132                      22.0000000    4.20353  80.9%  26.0    3s
H  272   173                      21.0000000    4.89542  76.7%  24.3    3s
*  286   157              46      20.0000000    4.89542  75.5%  24.6    3s
   636   300   17.01840   28  368   20.00000    8.51583  57.4%  31.6    5s
*  944   358              44      19.0000000    8.51583  55.2%  35.0    5s
H  974   330                      18.0000000    8.51583  52.7%  34.6    5s
  2775   383   16.56075   34  371   18.00000   12.42861  31.0%  31.3   10s
  3629   345   15.16817   32  434   18.00000   13.35188  25.8%  30.5   15s

Explored 5307 nodes (156119 simplex iterations) in 19.78 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%