Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:40:24 2013

Optimize a model with 39122 rows, 38502 columns and 153822 nonzeros
Presolve removed 1859 rows and 0 columns
Presolve time: 0.23s
Presolved: 37263 rows, 38502 columns, 150104 nonzeros
Variable types: 38440 continuous, 62 integer (62 binary)

Root relaxation: objective 6.931615e+04, 7336 iterations, 1.06 seconds

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

     0     0 69316.1499    0    5          - 69316.1499     -      -    1s
H    0     0                    71104.000000 69316.1499  2.51%     -    1s
H    0     0                    69894.000000 69316.1499  0.83%     -    1s
     0     0 69322.8197    0    7 69894.0000 69322.8197  0.82%     -    1s
     0     0 69322.8229    0    7 69894.0000 69322.8229  0.82%     -    2s
     0     0 69327.5968    0    5 69894.0000 69327.5968  0.81%     -    2s
     0     2 69327.6354    0    5 69894.0000 69327.6354  0.81%     -    3s
*    7     7               5    69701.000000 69397.3220  0.44%   129    3s
H   15     8                    69602.000000 69397.3220  0.29%  85.1    4s
*   17     9              15    69562.000000 69397.3220  0.24%  78.5    4s
    43    14     cutoff    4      69562.0000 69414.1095  0.21%  65.8    5s
*   54    15               7    69550.000000 69451.5217  0.14%  60.0    5s
*   78     0               8    69520.000000 69520.0000   0.0%  54.3    5s

Cutting planes:
  Gomory: 2
  Flow cover: 3

Explored 79 nodes (11750 simplex iterations) in 5.73 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.952000000000e+04, best bound 6.952000000000e+04, gap 0.0%