Gurobi 5.0.1 (linux64) logging started Wed Apr 24 03:09:36 2013

Optimize a model with 60137 rows, 59367 columns and 237237 nonzeros
Presolve removed 6593 rows and 0 columns
Presolve time: 0.38s
Presolved: 53544 rows, 59367 columns, 224051 nonzeros
Variable types: 59290 continuous, 77 integer (77 binary)

Root relaxation: objective 8.787084e+04, 13451 iterations, 2.54 seconds

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

     0     0 87870.8426    0    5          - 87870.8426     -      -    3s
H    0     0                    89025.000000 87870.8426  1.30%     -    3s
H    0     0                    88546.000000 87870.8426  0.76%     -    3s
     0     0 87873.8655    0    5 88546.0000 87873.8655  0.76%     -    3s
     0     0 87873.8655    0    5 88546.0000 87873.8655  0.76%     -    4s
     0     0 87873.8655    0    5 88546.0000 87873.8655  0.76%     -    8s
     0     0 87873.8655    0    5 88546.0000 87873.8655  0.76%     -    9s
     0     0 87873.8655    0    5 88546.0000 87873.8655  0.76%     -    9s
     0     2 87876.3984    0    5 88546.0000 87876.3984  0.76%     -   11s
*    7     7               6    88206.000000 87963.9317  0.27%   213   12s
H   28     0                    88178.000000 88041.8059  0.15%   162   13s
*   35     2               7    88177.000000 88166.9006  0.01%   144   13s

Cutting planes:
  Gomory: 1
  Flow cover: 9

Explored 37 nodes (24166 simplex iterations) in 13.87 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.817700000000e+04, best bound 8.817532118470e+04, gap 0.0019%