Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:18:55 2013

Optimize a model with 49770 rows, 49070 columns and 196070 nonzeros
Presolve removed 3234 rows and 0 columns
Presolve time: 0.30s
Presolved: 46536 rows, 49070 columns, 189602 nonzeros
Variable types: 49000 continuous, 70 integer (70 binary)

Root relaxation: objective 8.080152e+04, 9573 iterations, 1.68 seconds

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

     0     0 80801.5178    0    2          - 80801.5178     -      -    2s
H    0     0                    81774.000000 80801.5178  1.19%     -    2s
     0     0 80803.4216    0    3 81774.0000 80803.4216  1.19%     -    2s
     0     0 80803.4216    0    3 81774.0000 80803.4216  1.19%     -    2s
     0     0 80803.4216    0    3 81774.0000 80803.4216  1.19%     -    3s
     0     2 80803.8411    0    3 81774.0000 80803.8411  1.19%     -    5s
H    3     3                    81594.000000 80882.3333  0.87%  98.0    5s
*   22     8              21    81491.000000 80882.7632  0.75%  98.6    7s
*   35    17              16    81410.000000 80918.3143  0.60%  90.9    8s
H   54    10                    81254.573333 80944.3835  0.38%  89.2    9s
H   54     4                    81179.000000 80944.3835  0.29%  89.2    9s

Cutting planes:
  Gomory: 1
  Flow cover: 3

Explored 69 nodes (15427 simplex iterations) in 9.67 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.117900000000e+04, best bound 8.117284863946e+04, gap 0.0076%