Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:31:30 2013

Optimize a model with 52632 rows, 51912 columns and 207432 nonzeros
Presolve removed 3737 rows and 0 columns
Presolve time: 0.32s
Presolved: 48895 rows, 51912 columns, 199958 nonzeros
Variable types: 51840 continuous, 72 integer (72 binary)

Root relaxation: objective 9.087412e+04, 11361 iterations, 2.04 seconds

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

     0     0 90874.1215    0    4          - 90874.1215     -      -    2s
H    0     0                    91954.000000 90874.1215  1.17%     -    2s
H    0     0                    91778.000000 90874.1215  0.98%     -    2s
     0     0 90877.0977    0    5 91778.0000 90877.0977  0.98%     -    3s
H    0     0                    91290.000000 90877.0977  0.45%     -    4s
     0     0 90877.0977    0    4 91290.0000 90877.0977  0.45%     -    6s
     0     0 90877.1228    0    5 91290.0000 90877.1228  0.45%     -    6s
     0     0 90877.1228    0    5 91290.0000 90877.1228  0.45%     -    6s
     0     2 90881.4142    0    5 91290.0000 90881.4142  0.45%     -    7s
H    7     5                    91244.000000 90940.1219  0.33%  36.1    7s
H    9     7                    91212.242424 90940.1219  0.30%  37.6    7s
*   13     6              11    91092.000000 90940.1219  0.17%  34.7    8s

Cutting planes:
  Gomory: 1
  Flow cover: 5

Explored 21 nodes (16542 simplex iterations) in 8.19 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 9.109200000000e+04, best bound 9.109200000000e+04, gap 0.0%