Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:31:22 2013

Optimize a model with 52632 rows, 51912 columns and 207432 nonzeros
Presolve removed 2144 rows and 0 columns
Presolve time: 0.32s
Presolved: 50488 rows, 51912 columns, 203144 nonzeros
Variable types: 51840 continuous, 72 integer (72 binary)

Root relaxation: objective 8.436799e+04, 9551 iterations, 1.64 seconds

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

     0     0 84367.9947    0    3          - 84367.9947     -      -    2s
H    0     0                    85171.000000 84367.9947  0.94%     -    2s
H    0     0                    84632.000000 84367.9947  0.31%     -    2s
     0     0 84369.7570    0    4 84632.0000 84369.7570  0.31%     -    2s
     0     0 84369.7570    0    3 84632.0000 84369.7570  0.31%     -    4s
     0     0 84369.7570    0    4 84632.0000 84369.7570  0.31%     -    4s
     0     0 84369.7570    0    4 84632.0000 84369.7570  0.31%     -    4s
     0     2 84372.1756    0    4 84632.0000 84372.1756  0.31%     -    5s

Cutting planes:
  Gomory: 1
  Flow cover: 4

Explored 9 nodes (14148 simplex iterations) in 5.61 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.463200000000e+04, best bound 8.463200000000e+04, gap 0.0%