Gurobi 5.0.1 (linux64) logging started Sun Nov 18 07:26:56 2012

Optimize a model with 268 rows, 763 columns and 763 nonzeros
Model has 534 quadratic constraints
Presolve removed 0 rows and 23 columns
Presolve time: 3.11s
Presolved: 268 rows, 740 columns, 740 nonzeros
Variable types: 534 continuous, 206 integer (205 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                     125.0000000          -     -      -    3s
     0     0    0.00000    0   96  125.00000    0.00000   100%     -    3s
     0     0    0.00000    0  112  125.00000    0.00000   100%     -    3s
     0     0    0.00000    0  105  125.00000    0.00000   100%     -    3s
     0     2    0.00000    0   91  125.00000    0.00000   100%     -    3s
H   45    45                      25.0000000    2.05263  91.8%  33.8    3s
H  230   110                      21.0000000    3.82000  81.8%  22.0    3s
*  230   101              20      20.0000000    3.82000  80.9%  22.0    3s
   601   247    8.09013    4  105   20.00000    8.00658  60.0%  20.4    5s
  2115   518   19.14286   43  382   20.00000   11.47799  42.6%  33.8   10s
  4633   920     cutoff   41        20.00000   14.00000  30.0%  31.3   15s
* 6633   721              47      19.0000000   15.19310  20.0%  31.1   18s
  7144   559   17.99791   39  388   19.00000   15.96970  15.9%  31.3   20s

Explored 8008 nodes (256817 simplex iterations) in 21.72 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%