Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:37:35 2013

Optimize a model with 54093 rows, 53363 columns and 213233 nonzeros
Presolve removed 3643 rows and 0 columns
Presolve time: 0.35s
Presolved: 50450 rows, 53363 columns, 205947 nonzeros
Variable types: 53290 continuous, 73 integer (73 binary)

Root relaxation: objective 7.334953e+04, 10105 iterations, 2.10 seconds

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

     0     0 73349.5335    0    2          - 73349.5335     -      -    2s
H    0     0                    74403.000000 73349.5335  1.42%     -    2s
H    0     0                    73491.000000 73349.5335  0.19%     -    3s
     0     0 73349.6209    0    4 73491.0000 73349.6209  0.19%     -    3s
     0     0 73371.2000    0    2 73491.0000 73371.2000  0.16%     -    3s
     0     0 73371.2000    0    2 73491.0000 73371.2000  0.16%     -    5s
     0     0 73371.2000    0    2 73491.0000 73371.2000  0.16%     -    5s
     0     2 73371.3019    0    2 73491.0000 73371.3019  0.16%     -    6s
*    2     2               2    73424.000000 73371.3019  0.07%  84.0    6s

Cutting planes:
  Flow cover: 1

Explored 4 nodes (13113 simplex iterations) in 6.30 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.342400000000e+04, best bound 7.342400000000e+04, gap 0.0%