Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:24:10 2013

Optimize a model with 51191 rows, 50481 columns and 201711 nonzeros
Presolve removed 2286 rows and 0 columns
Presolve time: 0.32s
Presolved: 48905 rows, 50481 columns, 197139 nonzeros
Variable types: 50410 continuous, 71 integer (71 binary)

Root relaxation: objective 8.324212e+04, 12038 iterations, 2.37 seconds

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

     0     0 83242.1222    0    7          - 83242.1222     -      -    2s
H    0     0                    86036.000000 83242.1222  3.25%     -    3s
H    0     0                    85953.000000 83242.1222  3.15%     -    3s
H    0     0                    84082.000000 83242.1222  1.00%     -    3s
     0     0 83255.5181    0    7 84082.0000 83255.5181  0.98%     -    3s
     0     0 83255.8400    0    9 84082.0000 83255.8400  0.98%     -    3s
     0     0 83255.8400    0    9 84082.0000 83255.8400  0.98%     -    4s
     0     0 83255.8530    0    9 84082.0000 83255.8530  0.98%     -    4s
     0     2 83291.7996    0    9 84082.0000 83291.7996  0.94%     -    6s
*    6     6               4    83632.000000 83448.8060  0.22%   179    7s

Cutting planes:
  Gomory: 2
  Flow cover: 9

Explored 17 nodes (14358 simplex iterations) in 7.76 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.363200000000e+04, best bound 8.362973018454e+04, gap 0.0027%