Gurobi 5.0.1 (linux64) logging started Wed Apr 24 03:37:00 2013

Optimize a model with 64880 rows, 64080 columns and 256080 nonzeros
Presolve removed 4591 rows and 0 columns
Presolve time: 0.41s
Presolved: 60289 rows, 64080 columns, 246898 nonzeros
Variable types: 64000 continuous, 80 integer (80 binary)

Root relaxation: objective 7.515122e+04, 10206 iterations, 2.51 seconds

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

     0     0 75151.2197    0    2          - 75151.2197     -      -    3s
H    0     0                    75862.000000 75151.2197  0.94%     -    3s
     0     0 75152.5220    0    3 75862.0000 75152.5220  0.94%     -    3s
H    0     0                    75764.777778 75152.5220  0.81%     -    4s
     0     2 75152.6229    0    3 75764.7778 75152.6229  0.81%     -    5s
H    2     2                    75712.348837 75153.1628  0.74%   7.5    5s
*   20     9              20    75443.000000 75181.9419  0.35%  89.5    8s
*   25    10               6    75381.000000 75220.8323  0.21%  97.5    8s
*   29     7               3    75343.000000 75234.1296  0.14%   108    9s

Cutting planes:
  Gomory: 1
  Flow cover: 2

Explored 40 nodes (13751 simplex iterations) in 9.48 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.534300000000e+04, best bound 7.534300000000e+04, gap 0.0%