Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:01:50 2013

Optimize a model with 19006 rows, 18576 columns and 74046 nonzeros
Presolve removed 43 rows and 0 columns
Presolve time: 0.08s
Presolved: 18963 rows, 18576 columns, 74003 nonzeros
Variable types: 18533 continuous, 43 integer (43 binary)

Root relaxation: objective 3.785623e+04, 2885 iterations, 0.85 seconds

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

     0     0 37856.2252    0   37          - 37856.2252     -      -    1s
H    0     0                    46646.000000 37856.2252  18.8%     -    1s
     0     0 43983.5444    0   11 46646.0000 43983.5444  5.71%     -    2s
H    0     0                    45737.000000 43983.5444  3.83%     -    2s
     0     0 44185.7559    0    4 45737.0000 44185.7559  3.39%     -    2s
H    0     0                    44987.800963 44185.7559  1.78%     -    2s
H    0     0                    44595.000000 44185.7559  0.92%     -    2s
H    0     0                    44263.000000 44185.7559  0.17%     -    2s
     0     0 44226.0933    0    4 44263.0000 44226.0933  0.08%     -    2s
     0     0 44229.0927    0    3 44263.0000 44229.0927  0.08%     -    2s
     0     2 44233.3548    0    3 44263.0000 44233.3548  0.07%     -    2s

Cutting planes:
  Implied bound: 39

Explored 5 nodes (4751 simplex iterations) in 2.96 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.426300000000e+04, best bound 4.426300000000e+04, gap 0.0%