Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:19:14 2013

Optimize a model with 49770 rows, 49070 columns and 196070 nonzeros
Presolve removed 3121 rows and 0 columns
Presolve time: 0.30s
Presolved: 46649 rows, 49070 columns, 189828 nonzeros
Variable types: 49000 continuous, 70 integer (70 binary)

Root relaxation: objective 8.148118e+04, 9722 iterations, 1.64 seconds

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

     0     0 81481.1802    0    4          - 81481.1802     -      -    2s
H    0     0                    83028.000000 81481.1802  1.86%     -    2s
     0     0 81481.3284    0    5 83028.0000 81481.3284  1.86%     -    2s
     0     0 81481.3284    0    5 83028.0000 81481.3284  1.86%     -    2s
     0     0 81481.3284    0    5 83028.0000 81481.3284  1.86%     -    3s
     0     2 81482.0482    0    5 83028.0000 81482.0482  1.86%     -    4s
H    2     2                    82231.860704 81504.0444  0.89%  25.5    4s
H    3     3                    81588.000000 81546.0688  0.05%  52.0    4s
*    6     5               5    81563.000000 81556.8971  0.01%  61.2    4s

Cutting planes:
  Gomory: 1
  Flow cover: 4

Explored 7 nodes (10104 simplex iterations) in 4.63 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.156300000000e+04, best bound 8.155689713412e+04, gap 0.0075%