Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:52:48 2013

Optimize a model with 57075 rows, 56325 columns and 225075 nonzeros
Presolve removed 3425 rows and 0 columns
Presolve time: 0.35s
Presolved: 53650 rows, 56325 columns, 218225 nonzeros
Variable types: 56250 continuous, 75 integer (75 binary)

Root relaxation: objective 7.955661e+04, 10393 iterations, 2.00 seconds

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

     0     0 79556.6103    0    5          - 79556.6103     -      -    2s
H    0     0                    83370.000000 79556.6103  4.57%     -    2s
     0     0 79561.6339    0    8 83370.0000 79561.6339  4.57%     -    3s
     0     0 79562.1485    0    9 83370.0000 79562.1485  4.57%     -    3s
     0     0 79562.1485    0    9 83370.0000 79562.1485  4.57%     -    4s
     0     0 79562.1493    0    9 83370.0000 79562.1493  4.57%     -    4s
H    0     0                    83107.507130 79562.1493  4.27%     -    6s
H    0     0                    79917.000000 79562.1493  0.44%     -    7s
     0     0 79562.1493    0    5 79917.0000 79562.1493  0.44%     -    9s
     0     0 79562.7829    0    7 79917.0000 79562.7829  0.44%     -    9s
     0     0 79563.6791    0    7 79917.0000 79563.6791  0.44%     -    9s
     0     0 79563.6791    0    7 79917.0000 79563.6791  0.44%     -   10s
     0     0 79563.6803    0    7 79917.0000 79563.6803  0.44%     -   10s
     0     2 79563.9371    0    7 79917.0000 79563.9371  0.44%     -   12s
H   11     5                    79788.000000 79676.5656  0.14%  57.1   12s
*   15     3              12    79747.000000 79676.5656  0.09%  47.1   12s

Cutting planes:
  Gomory: 3
  Flow cover: 12

Explored 19 nodes (17082 simplex iterations) in 12.99 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.974700000000e+04, best bound 7.974700000000e+04, gap 0.0%