Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:31:13 2013

Optimize a model with 52632 rows, 51912 columns and 207432 nonzeros
Presolve removed 1611 rows and 0 columns
Presolve time: 0.31s
Presolved: 51021 rows, 51912 columns, 204210 nonzeros
Variable types: 51840 continuous, 72 integer (72 binary)

Root relaxation: objective 8.350996e+04, 10974 iterations, 1.88 seconds

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

     0     0 83509.9629    0    4          - 83509.9629     -      -    2s
H    0     0                    84489.000000 83509.9629  1.16%     -    2s
H    0     0                    83663.000000 83509.9629  0.18%     -    2s
     0     0 83514.6293    0    5 83663.0000 83514.6293  0.18%     -    2s
     0     0 83514.6293    0    5 83663.0000 83514.6293  0.18%     -    3s
     0     0 83514.6293    0    4 83663.0000 83514.6293  0.18%     -    5s
     0     0 83514.6293    0    5 83663.0000 83514.6293  0.18%     -    5s
     0     0 83514.6293    0    5 83663.0000 83514.6293  0.18%     -    5s
     0     2 83514.8325    0    5 83663.0000 83514.8325  0.18%     -    6s

Cutting planes:
  Gomory: 1
  Flow cover: 4

Explored 24 nodes (16203 simplex iterations) in 6.98 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.366300000000e+04, best bound 8.365615047393e+04, gap 0.0082%