Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:01:55 2013

Optimize a model with 45627 rows, 44957 columns and 179627 nonzeros
Presolve removed 1898 rows and 0 columns
Presolve time: 0.26s
Presolved: 43729 rows, 44957 columns, 175831 nonzeros
Variable types: 44890 continuous, 67 integer (67 binary)

Root relaxation: objective 8.126342e+04, 9468 iterations, 1.72 seconds

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

     0     0 81263.4181    0    7          - 81263.4181     -      -    2s
H    0     0                    82696.000000 81263.4181  1.73%     -    2s
     0     0 81266.5424    0    9 82696.0000 81266.5424  1.73%     -    2s
     0     0 81266.5424    0    9 82696.0000 81266.5424  1.73%     -    2s
     0     0 81266.6531    0    9 82696.0000 81266.6531  1.73%     -    3s
H    0     0                    82022.000000 81266.6531  0.92%     -    4s
     0     2 81272.9140    0    9 82022.0000 81272.9140  0.91%     -    5s
H   12     9                    81571.470588 81356.7971  0.26%  88.7    6s
*   13     9              11    81515.000000 81356.7971  0.19%  85.8    6s
*   45    14              11    81495.000000 81395.7457  0.12%  63.3    7s
*   56    16              12    81492.000000 81412.0331  0.10%  59.9    8s
*   76     6               5    81481.000000 81466.9562  0.02%  54.5    8s

Cutting planes:
  Gomory: 3
  Flow cover: 8

Explored 81 nodes (13706 simplex iterations) in 8.47 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.148100000000e+04, best bound 8.147616502824e+04, gap 0.0059%