Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:06:57 2013

Optimize a model with 46988 rows, 46308 columns and 185028 nonzeros
Presolve removed 1060 rows and 0 columns
Presolve time: 0.27s
Presolved: 45928 rows, 46308 columns, 182908 nonzeros
Variable types: 46240 continuous, 68 integer (68 binary)

Root relaxation: objective 7.291897e+04, 8990 iterations, 1.57 seconds

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

     0     0 72918.9745    0    4          - 72918.9745     -      -    1s
H    0     0                    73910.000000 72918.9745  1.34%     -    2s
H    0     0                    73037.000000 72918.9745  0.16%     -    2s
     0     0 72922.9784    0    5 73037.0000 72922.9784  0.16%     -    2s
     0     0 72922.9784    0    4 73037.0000 72922.9784  0.16%     -    4s
     0     0 72923.8283    0    5 73037.0000 72923.8283  0.15%     -    4s
     0     0 72923.8574    0    5 73037.0000 72923.8574  0.15%     -    4s
     0     0 72923.8574    0    5 73037.0000 72923.8574  0.15%     -    4s
     0     0 72986.2821    0    2 73037.0000 72986.2821  0.07%     -    4s
     0     2 72987.8462    0    2 73037.0000 72987.8462  0.07%     -    5s

Cutting planes:
  Gomory: 2
  Flow cover: 1

Explored 8 nodes (12667 simplex iterations) in 5.55 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.303700000000e+04, best bound 7.303700000000e+04, gap 0.0%