Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:31:47 2013

Optimize a model with 52632 rows, 51912 columns and 207432 nonzeros
Presolve removed 2795 rows and 0 columns
Presolve time: 0.31s
Presolved: 49837 rows, 51912 columns, 201842 nonzeros
Variable types: 51840 continuous, 72 integer (72 binary)

Root relaxation: objective 8.198226e+04, 11767 iterations, 2.17 seconds

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

     0     0 81982.2607    0    4          - 81982.2607     -      -    2s
H    0     0                    83819.000000 81982.2607  2.19%     -    2s
     0     0 81999.7665    0    7 83819.0000 81999.7665  2.17%     -    3s
     0     0 82000.0205    0    7 83819.0000 82000.0205  2.17%     -    3s
H    0     0                    83175.000000 82000.0205  1.41%     -    5s
     0     2 82017.6797    0    7 83175.0000 82017.6797  1.39%     -    5s
H    7     7                    82668.322581 82190.4118  0.58%   156    6s
*   15     6              14    82590.000000 82190.4118  0.48%   131    7s
H   22    11                    82575.428571 82215.9897  0.44%   112    7s
*   23    10               9    82366.000000 82215.9897  0.18%   111    7s
*   37     5               6    82297.000000 82268.7748  0.03%  93.4    8s

Cutting planes:
  Gomory: 3
  Flow cover: 3

Explored 41 nodes (15571 simplex iterations) in 8.43 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.229700000000e+04, best bound 8.229300000000e+04, gap 0.0049%