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

Optimize a model with 45627 rows, 44957 columns and 179627 nonzeros
Presolve removed 1066 rows and 0 columns
Presolve time: 0.27s
Presolved: 44561 rows, 44957 columns, 177495 nonzeros
Variable types: 44890 continuous, 67 integer (67 binary)

Root relaxation: objective 6.700163e+04, 8978 iterations, 1.70 seconds

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

     0     0 67001.6325    0    4          - 67001.6325     -      -    2s
H    0     0                    68514.000000 67001.6325  2.21%     -    2s
H    0     0                    67132.000000 67001.6325  0.19%     -    2s
     0     0 67002.6426    0    4 67132.0000 67002.6426  0.19%     -    2s
     0     0 67002.6426    0    4 67132.0000 67002.6426  0.19%     -    2s
     0     0 67010.4996    0    5 67132.0000 67010.4996  0.18%     -    3s
     0     0 67010.4996    0    4 67132.0000 67010.4996  0.18%     -    5s
     0     0 67010.5069    0    6 67132.0000 67010.5069  0.18%     -    5s
     0     0 67010.5069    0    6 67132.0000 67010.5069  0.18%     -    6s
     0     2 67010.7490    0    6 67132.0000 67010.7490  0.18%     -    7s

Cutting planes:
  Gomory: 3
  Flow cover: 4

Explored 12 nodes (13187 simplex iterations) in 7.99 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.713200000000e+04, best bound 6.713200000000e+04, gap 0.0%