Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:37:44 2013

Optimize a model with 54093 rows, 53363 columns and 213233 nonzeros
Presolve removed 2138 rows and 0 columns
Presolve time: 0.33s
Presolved: 51955 rows, 53363 columns, 208957 nonzeros
Variable types: 53290 continuous, 73 integer (73 binary)

Root relaxation: objective 8.150324e+04, 11420 iterations, 2.04 seconds

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

     0     0 81503.2413    0    3          - 81503.2413     -      -    2s
H    0     0                    82913.000000 81503.2413  1.70%     -    2s
     0     0 81505.2838    0    5 82913.0000 81505.2838  1.70%     -    3s
     0     0 81505.3213    0    5 82913.0000 81505.3213  1.70%     -    3s
H    0     0                    81766.000000 81505.3213  0.32%     -    4s
     0     0 81505.3213    0    3 81766.0000 81505.3213  0.32%     -    6s
     0     0 81505.6180    0    5 81766.0000 81505.6180  0.32%     -    6s
     0     0 81505.6429    0    5 81766.0000 81505.6429  0.32%     -    6s
     0     0 81509.6937    0    3 81766.0000 81509.6937  0.31%     -    7s
     0     2 81513.2624    0    3 81766.0000 81513.2624  0.31%     -    7s
*    5     4               4    81708.000000 81600.1349  0.13%   103    8s

Cutting planes:
  Gomory: 1
  Flow cover: 2

Explored 11 nodes (16461 simplex iterations) in 8.36 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.170800000000e+04, best bound 8.170800000000e+04, gap 0.0%