Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:44:40 2013

Optimize a model with 55574 rows, 54834 columns and 219114 nonzeros
Presolve removed 2515 rows and 0 columns
Presolve time: 0.34s
Presolved: 53059 rows, 54834 columns, 214084 nonzeros
Variable types: 54760 continuous, 74 integer (74 binary)

Root relaxation: objective 8.336957e+04, 10954 iterations, 2.04 seconds

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

     0     0 83369.5704    0    4          - 83369.5704     -      -    2s
H    0     0                    87231.000000 83369.5704  4.43%     -    2s
     0     0 83372.0570    0    5 87231.0000 83372.0570  4.42%     -    3s
     0     0 83372.6729    0    5 87231.0000 83372.6729  4.42%     -    3s
     0     0 83373.0313    0    5 87231.0000 83373.0313  4.42%     -    3s
     0     2 83376.7527    0    5 87231.0000 83376.7527  4.42%     -    5s
H    2     2                    85711.663043 83426.3666  2.67%   103    5s
H    3     3                    84983.678571 83445.6263  1.81%  98.7    5s
H    8     8                    84726.515152 83445.6263  1.51%   120    6s
H   11    11                    84547.000000 83445.6263  1.30%   105    6s
H   13    10                    83858.000000 83445.6263  0.49%  97.6    7s
H   27    10                    83754.000000 83550.1618  0.24%  90.7    8s
H   33    11                    83706.333333 83550.1618  0.19%  83.9    8s
H   46     8                    83698.000000 83616.8125  0.10%  85.9    9s
*   49     7              17    83678.000000 83616.8125  0.07%  80.8    9s
*   66     2               9    83663.000000 83639.4772  0.03%  71.6    9s

Cutting planes:
  Gomory: 2
  Flow cover: 3

Explored 68 nodes (15788 simplex iterations) in 9.91 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.366300000000e+04, best bound 8.365485790032e+04, gap 0.0097%