Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:30:30 2013

Optimize a model with 52632 rows, 51912 columns and 207432 nonzeros
Presolve removed 2757 rows and 0 columns
Presolve time: 0.32s
Presolved: 49875 rows, 51912 columns, 201918 nonzeros
Variable types: 51840 continuous, 72 integer (72 binary)

Root relaxation: objective 8.793659e+04, 12354 iterations, 2.38 seconds

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

     0     0 87936.5869    0    4          - 87936.5869     -      -    2s
H    0     0                    91787.000000 87936.5869  4.19%     -    3s
     0     0 87941.1389    0    5 91787.0000 87941.1389  4.19%     -    3s
     0     0 87941.1389    0    5 91787.0000 87941.1389  4.19%     -    3s
     0     0 87941.1389    0    5 91787.0000 87941.1389  4.19%     -    4s
H    0     0                    89578.819686 87941.1389  1.83%     -    5s
H    0     0                    88533.000000 87941.1389  0.67%     -    6s
     0     0 87941.1389    0    4 88533.0000 87941.1389  0.67%     -    8s
     0     0 87941.1389    0    5 88533.0000 87941.1389  0.67%     -    8s
     0     2 87949.0131    0    5 88533.0000 87949.0131  0.66%     -   10s
*   15     9              14    88479.000000 88104.2155  0.42%   101   11s
*   39    12               8    88465.000000 88157.1570  0.35%  94.3   12s
*   47    12               6    88457.000000 88173.0000  0.32%   106   12s
*   49     7               8    88396.000000 88173.0000  0.25%   102   12s

Cutting planes:
  Gomory: 2
  Flow cover: 3

Explored 61 nodes (25090 simplex iterations) in 12.85 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.839600000000e+04, best bound 8.839600000000e+04, gap 0.0%