Gurobi 5.0.1 (linux64) logging started Wed Apr 24 03:00:58 2013

Optimize a model with 58596 rows, 57836 columns and 231116 nonzeros
Presolve removed 5440 rows and 0 columns
Presolve time: 0.37s
Presolved: 53156 rows, 57836 columns, 220236 nonzeros
Variable types: 57760 continuous, 76 integer (76 binary)

Root relaxation: objective 8.166144e+04, 9323 iterations, 1.72 seconds

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

     0     0 81661.4431    0    3          - 81661.4431     -      -    2s
H    0     0                    83255.000000 81661.4431  1.91%     -    2s
H    0     0                    82098.000000 81661.4431  0.53%     -    2s
     0     0 81662.8243    0    4 82098.0000 81662.8243  0.53%     -    2s
     0     0 81662.9340    0    4 82098.0000 81662.9340  0.53%     -    3s
     0     0 81662.9340    0    3 82098.0000 81662.9340  0.53%     -    6s
     0     0 81662.9340    0    4 82098.0000 81662.9340  0.53%     -    6s
     0     0 81662.9340    0    4 82098.0000 81662.9340  0.53%     -    6s
     0     2 81663.5239    0    4 82098.0000 81663.5239  0.53%     -    8s
H   19     6                    81947.000000 81719.4929  0.28%  53.4    9s
*   23     5              19    81933.000000 81719.4929  0.26%  47.0    9s
*   41     4               8    81802.000000 81780.1945  0.03%  55.5    9s

Cutting planes:
  Gomory: 1
  Flow cover: 5

Explored 44 nodes (16355 simplex iterations) in 9.83 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.180200000000e+04, best bound 8.180200000000e+04, gap 0.0%