Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:45:44 2013

Optimize a model with 55574 rows, 54834 columns and 219114 nonzeros
Presolve removed 2084 rows and 0 columns
Presolve time: 0.34s
Presolved: 53490 rows, 54834 columns, 214946 nonzeros
Variable types: 54760 continuous, 74 integer (74 binary)

Root relaxation: objective 7.435613e+04, 9853 iterations, 1.89 seconds

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

     0     0 74356.1294    0    3          - 74356.1294     -      -    2s
H    0     0                    75722.000000 74356.1294  1.80%     -    2s
H    0     0                    74490.000000 74356.1294  0.18%     -    2s
     0     0 74358.0801    0    4 74490.0000 74358.0801  0.18%     -    3s
     0     0 74358.0801    0    3 74490.0000 74358.0801  0.18%     -    4s
     0     0 74358.1492    0    4 74490.0000 74358.1492  0.18%     -    5s
     0     0 74358.2075    0    4 74490.0000 74358.2075  0.18%     -    5s
     0     2 74363.7920    0    4 74490.0000 74363.7920  0.17%     -    6s

Cutting planes:
  Gomory: 1
  Flow cover: 7

Explored 12 nodes (14069 simplex iterations) in 7.10 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.449000000000e+04, best bound 7.449000000000e+04, gap 0.0%