Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:01:49 2013

Optimize a model with 45627 rows, 44957 columns and 179627 nonzeros
Presolve removed 1304 rows and 0 columns
Presolve time: 0.27s
Presolved: 44323 rows, 44957 columns, 177019 nonzeros
Variable types: 44890 continuous, 67 integer (67 binary)

Root relaxation: objective 7.159210e+04, 9513 iterations, 2.68 seconds

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

     0     0 71592.0977    0    4          - 71592.0977     -      -    3s
H    0     0                    72657.000000 71592.0977  1.47%     -    3s
H    0     0                    71615.000000 71592.0977  0.03%     -    3s
     0     0 71593.0542    0    5 71615.0000 71593.0542  0.03%     -    3s
     0     0 71593.0542    0    5 71615.0000 71593.0542  0.03%     -    3s
     0     0 71613.0588    0    1 71615.0000 71613.0588  0.00%     -    4s

Cutting planes:
  Gomory: 1
  Flow cover: 6

Explored 0 nodes (9682 simplex iterations) in 4.65 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.161500000000e+04, best bound 7.161305882353e+04, gap 0.0027%