Gurobi 5.0.1 (linux64) logging started Wed Apr 24 03:26:37 2013

Optimize a model with 63279 rows, 62489 columns and 249719 nonzeros
Presolve removed 3324 rows and 0 columns
Presolve time: 0.39s
Presolved: 59955 rows, 62489 columns, 243071 nonzeros
Variable types: 62410 continuous, 79 integer (79 binary)

Root relaxation: objective 8.140859e+04, 12880 iterations, 2.59 seconds

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

     0     0 81408.5853    0    4          - 81408.5853     -      -    3s
H    0     0                    84912.000000 81408.5853  4.13%     -    3s
     0     0 81410.8188    0    6 84912.0000 81410.8188  4.12%     -    4s
     0     0 81410.9492    0    6 84912.0000 81410.9492  4.12%     -    4s
     0     2 81413.7706    0    6 84912.0000 81413.7706  4.12%     -    6s
H    2     2                    83540.626706 81518.2751  2.42%   200    7s
H    3     3                    82655.857143 81571.0460  1.31%   237    7s
H    9     9                    82601.310345 81571.0460  1.25%   169    8s
H   10     8                    81997.000000 81571.0460  0.52%   158    8s
    21     8 81643.7114    2    4 81997.0000 81629.0838  0.45%   151   10s
*   26     9               5    81908.000000 81629.0838  0.34%   195   11s
H   33     7                    81897.000000 81676.3514  0.27%   174   11s
*   34     7               4    81829.000000 81676.3514  0.19%   170   11s
*   41     4               8    81734.000000 81683.4000  0.06%   156   12s

Cutting planes:
  Gomory: 2
  Flow cover: 9

Explored 48 nodes (19988 simplex iterations) in 12.29 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.173400000000e+04, best bound 8.173400000000e+04, gap 0.0%