Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:13:19 2013

Optimize a model with 48369 rows, 47679 columns and 190509 nonzeros
Presolve removed 2997 rows and 0 columns
Presolve time: 0.29s
Presolved: 45372 rows, 47679 columns, 184515 nonzeros
Variable types: 47610 continuous, 69 integer (69 binary)

Root relaxation: objective 8.136923e+04, 10349 iterations, 1.78 seconds

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

     0     0 81369.2299    0    5          - 81369.2299     -      -    2s
H    0     0                    83561.000000 81369.2299  2.62%     -    2s
     0     0 81369.7514    0    7 83561.0000 81369.7514  2.62%     -    2s
     0     0 81369.7514    0    7 83561.0000 81369.7514  2.62%     -    3s
H    0     0                    83386.945119 81369.7514  2.42%     -    4s
H    0     0                    83324.375000 81369.7514  2.35%     -    4s
H    0     0                    81617.000000 81369.7514  0.30%     -    4s
     0     0 81375.5162    0    5 81617.0000 81375.5162  0.30%     -    5s
     0     0 81376.0313    0    7 81617.0000 81376.0313  0.30%     -    6s
     0     0 81376.0313    0    7 81617.0000 81376.0313  0.30%     -    6s
     0     0 81394.8112    0    5 81617.0000 81394.8112  0.27%     -    6s
     0     2 81395.0645    0    5 81617.0000 81395.0645  0.27%     -    7s

Cutting planes:
  Flow cover: 1

Explored 27 nodes (16822 simplex iterations) in 7.82 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.161700000000e+04, best bound 8.161700000000e+04, gap 0.0%