Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:45:02 2013

Optimize a model with 55574 rows, 54834 columns and 219114 nonzeros
Presolve removed 2826 rows and 0 columns
Presolve time: 0.34s
Presolved: 52748 rows, 54834 columns, 213462 nonzeros
Variable types: 54760 continuous, 74 integer (74 binary)

Root relaxation: objective 8.007477e+04, 9486 iterations, 1.85 seconds

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

     0     0 80074.7705    0    5          - 80074.7705     -      -    2s
H    0     0                    80554.000000 80074.7705  0.59%     -    2s
     0     0 80076.9691    0    6 80554.0000 80076.9691  0.59%     -    2s
     0     0 80076.9691    0    6 80554.0000 80076.9691  0.59%     -    3s
H    0     0                    80273.000000 80076.9691  0.24%     -    4s
H    0     0                    80225.000000 80076.9691  0.18%     -    4s
     0     0 80089.9363    0    3 80225.0000 80089.9363  0.17%     -    5s
     0     0 80089.9363    0    3 80225.0000 80089.9363  0.17%     -    6s
     0     0 80089.9363    0    3 80225.0000 80089.9363  0.17%     -    6s
     0     2 80089.9900    0    3 80225.0000 80089.9900  0.17%     -    6s
*    8     6               6    80161.000000 80137.0746  0.03%  48.1    7s

Cutting planes:
  Gomory: 1
  Flow cover: 1

Explored 20 nodes (12929 simplex iterations) in 7.49 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.016100000000e+04, best bound 8.016100000000e+04, gap 0.0%