Gurobi 5.0.1 (linux64) logging started Wed Apr 24 03:09:52 2013

Optimize a model with 60137 rows, 59367 columns and 237237 nonzeros
Presolve removed 2848 rows and 0 columns
Presolve time: 0.37s
Presolved: 57289 rows, 59367 columns, 231541 nonzeros
Variable types: 59290 continuous, 77 integer (77 binary)

Root relaxation: objective 8.667675e+04, 13485 iterations, 2.91 seconds

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

     0     0 86676.7462    0    4          - 86676.7462     -      -    3s
H    0     0                    89365.000000 86676.7462  3.01%     -    3s
H    0     0                    86880.000000 86676.7462  0.23%     -    4s
     0     0 86690.2659    0    5 86880.0000 86690.2659  0.22%     -    4s
     0     0 86690.2659    0    5 86880.0000 86690.2659  0.22%     -    4s
     0     0 86777.3695    0    3 86880.0000 86777.3695  0.12%     -    5s
     0     0 86777.3695    0    2 86880.0000 86777.3695  0.12%     -    8s
     0     0 86782.8054    0    3 86880.0000 86782.8054  0.11%     -    8s
     0     0 86782.8054    0    3 86880.0000 86782.8054  0.11%     -    8s
     0     0 86782.8054    0    3 86880.0000 86782.8054  0.11%     -    8s
     0     0 86839.0187    0    2 86880.0000 86839.0187  0.05%     -    8s
     0     0 86839.3874    0    1 86880.0000 86839.3874  0.05%     -    9s
     0     2 86840.1383    0    1 86880.0000 86840.1383  0.05%     -    9s
*    2     2               2    86867.000000 86840.1383  0.03%  17.5    9s

Cutting planes:
  Gomory: 1
  Flow cover: 1

Explored 5 nodes (17563 simplex iterations) in 9.45 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.686700000000e+04, best bound 8.686700000000e+04, gap 0.0%