Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:44:30 2013

Optimize a model with 55574 rows, 54834 columns and 219114 nonzeros
Presolve removed 3457 rows and 0 columns
Presolve time: 0.34s
Presolved: 52117 rows, 54834 columns, 212200 nonzeros
Variable types: 54760 continuous, 74 integer (74 binary)

Root relaxation: objective 8.431802e+04, 10254 iterations, 1.74 seconds

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

     0     0 84318.0199    0    3          - 84318.0199     -      -    2s
H    0     0                    88464.000000 84318.0199  4.69%     -    2s
     0     0 84318.5054    0    5 88464.0000 84318.5054  4.69%     -    2s
     0     0 84318.5782    0    5 88464.0000 84318.5782  4.69%     -    3s
H    0     0                    86368.521698 84318.5782  2.37%     -    4s
H    0     0                    86071.792453 84318.5782  2.04%     -    4s
     0     2 84328.7117    0    5 86071.7925 84328.7117  2.03%     -    5s
H    5     5                    84896.818182 84387.0000  0.60%  70.6    5s
H    7     7                    84635.000000 84387.6452  0.29%  66.7    5s
H   17     6                    84594.000000 84406.1879  0.22%  61.9    6s
*   18     5               9    84492.000000 84406.1879  0.10%  64.6    6s
*   23     7              10    84483.000000 84416.2308  0.08%  56.6    6s

Cutting planes:
  Gomory: 2
  Flow cover: 4

Explored 30 nodes (11802 simplex iterations) in 6.90 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.448300000000e+04, best bound 8.447792767595e+04, gap 0.0060%