Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:31:40 2013

Optimize a model with 52632 rows, 51912 columns and 207432 nonzeros
Presolve removed 2200 rows and 0 columns
Presolve time: 0.31s
Presolved: 50432 rows, 51912 columns, 203032 nonzeros
Variable types: 51840 continuous, 72 integer (72 binary)

Root relaxation: objective 7.911566e+04, 10890 iterations, 1.85 seconds

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

     0     0 79115.6569    0    3          - 79115.6569     -      -    2s
H    0     0                    79833.000000 79115.6569  0.90%     -    2s
H    0     0                    79225.000000 79115.6569  0.14%     -    2s
     0     0 79123.7845    0    4 79225.0000 79123.7845  0.13%     -    2s
     0     0 79123.7845    0    3 79225.0000 79123.7845  0.13%     -    3s
     0     0 79124.9894    0    4 79225.0000 79124.9894  0.13%     -    4s
     0     0 79124.9894    0    4 79225.0000 79124.9894  0.13%     -    4s
     0     0 79137.3333    0    2 79225.0000 79137.3333  0.11%     -    4s
     0     2 79139.6667    0    2 79225.0000 79139.6667  0.11%     -    4s

Cutting planes:
  Gomory: 2
  Flow cover: 1

Explored 4 nodes (14452 simplex iterations) in 4.93 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.922500000000e+04, best bound 7.921853164379e+04, gap 0.0082%