Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:56:02 2013

Optimize a model with 44286 rows, 43626 columns and 174306 nonzeros
Presolve removed 3616 rows and 0 columns
Presolve time: 0.26s
Presolved: 40670 rows, 43626 columns, 167074 nonzeros
Variable types: 43560 continuous, 66 integer (66 binary)

Root relaxation: objective 8.700138e+04, 10332 iterations, 1.63 seconds

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

     0     0 87001.3829    0    3          - 87001.3829     -      -    2s
H    0     0                    87701.000000 87001.3829  0.80%     -    2s
H    0     0                    87267.000000 87001.3829  0.30%     -    2s
     0     0 87002.7702    0    4 87267.0000 87002.7702  0.30%     -    2s
     0     0 87002.7702    0    4 87267.0000 87002.7702  0.30%     -    2s
     0     0 87002.7702    0    3 87267.0000 87002.7702  0.30%     -    4s
     0     0 87002.7702    0    4 87267.0000 87002.7702  0.30%     -    5s
     0     0 87002.7702    0    4 87267.0000 87002.7702  0.30%     -    5s
     0     2 87003.3295    0    4 87267.0000 87003.3295  0.30%     -    6s
*   11     3               7    87251.000000 87070.6224  0.21%  78.1    6s
*   33     4               4    87215.000000 87097.5149  0.13%  53.0    6s

Cutting planes:
  Gomory: 1
  Flow cover: 4

Explored 37 nodes (17549 simplex iterations) in 6.87 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.721500000000e+04, best bound 8.721500000000e+04, gap 0.0%