Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:47:39 2013

Optimize a model with 680 rows, 24260 columns and 248680 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.44s
Presolved: 660 rows, 24240 columns, 228660 nonzeros
Variable types: 24040 continuous, 200 integer (200 binary)

Root relaxation: objective 3.860476e+04, 478 iterations, 0.03 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0 38604.7615    0    9          - 38604.7615     -      -    0s
     0     0 38605.4493    0    9          - 38605.4493     -      -    0s
     0     0 38605.4542    0    9          - 38605.4542     -      -    1s
     0     0 38605.4542    0    9          - 38605.4542     -      -    1s
     0     2 38606.1287    0    9          - 38606.1287     -      -    4s
    30    32 38863.8063   28    3          - 38628.3725     -    9.3    5s
*   65    20              63    38874.717770 38628.3725  0.63%   5.3    5s
*  140    67              46    38872.797767 38660.0131  0.55%   5.1    5s
*  171    54              26    38864.191403 38666.9230  0.51%   5.1    6s
*  218    12              16    38861.069269 38859.8500  0.00%   4.9    6s

Cutting planes:
  Flow cover: 5

Explored 219 nodes (1749 simplex iterations) in 6.34 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.886106926871e+04, best bound 3.885984999764e+04, gap 0.0031%