Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:56:45 2013

Optimize a model with 44286 rows, 43626 columns and 174306 nonzeros
Presolve removed 1478 rows and 0 columns
Presolve time: 0.26s
Presolved: 42808 rows, 43626 columns, 171350 nonzeros
Variable types: 43560 continuous, 66 integer (66 binary)

Root relaxation: objective 7.526723e+04, 9878 iterations, 1.59 seconds

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

     0     0 75267.2274    0    4          - 75267.2274     -      -    1s
H    0     0                    75994.000000 75267.2274  0.96%     -    2s
     0     0 75268.9447    0    6 75994.0000 75268.9447  0.95%     -    2s
     0     0 75269.3013    0    6 75994.0000 75269.3013  0.95%     -    2s
     0     0 75269.3101    0    6 75994.0000 75269.3101  0.95%     -    2s
     0     0 75269.3101    0    4 75994.0000 75269.3101  0.95%     -    5s
     0     0 75270.4308    0    7 75994.0000 75270.4308  0.95%     -    6s
     0     0 75270.6092    0    7 75994.0000 75270.6092  0.95%     -    6s
     0     2 75274.1422    0    7 75994.0000 75274.1422  0.95%     -    7s
*   13    11              10    75892.000000 75331.8756  0.74%   138    8s
H   21    11                    75854.761875 75449.4206  0.53%   108    8s
H   23     6                    75622.000000 75449.4206  0.23%   102    8s
*   45     0               8    75580.000000 75580.0000   0.0%  82.7    9s

Cutting planes:
  Gomory: 1
  Flow cover: 6

Explored 46 nodes (19425 simplex iterations) in 9.09 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.558000000000e+04, best bound 7.558000000000e+04, gap 0.0%