Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:37:08 2013

Optimize a model with 54093 rows, 53363 columns and 213233 nonzeros
Presolve removed 2801 rows and 0 columns
Presolve time: 0.32s
Presolved: 51292 rows, 53363 columns, 207631 nonzeros
Variable types: 53290 continuous, 73 integer (73 binary)

Root relaxation: objective 8.774372e+04, 12329 iterations, 2.59 seconds

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

     0     0 87743.7153    0    2          - 87743.7153     -      -    3s
H    0     0                    88335.000000 87743.7153  0.67%     -    3s
     0     0 87743.9894    0    4 88335.0000 87743.9894  0.67%     -    3s
     0     0 87743.9894    0    4 88335.0000 87743.9894  0.67%     -    4s
     0     2 87752.5872    0    4 88335.0000 87752.5872  0.66%     -    6s
H    3     3                    88262.269231 87765.6576  0.56%  62.3    7s
H    5     5                    88161.000000 87767.5696  0.45%  54.8    7s
H   14     8                    88129.909091 87775.6500  0.40%  77.5    8s
H   22     8                    88026.000000 87775.6500  0.28%  86.3    9s
*   23     5               5    87902.000000 87807.1246  0.11%  90.0    9s
H   28     0                    87871.000000 87863.6000  0.01%  80.4    9s

Cutting planes:
  Gomory: 2
  Flow cover: 3

Explored 28 nodes (14614 simplex iterations) in 9.37 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.787100000000e+04, best bound 8.786360000000e+04, gap 0.0084%