Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:23:44 2013

Optimize a model with 51191 rows, 50481 columns and 201711 nonzeros
Presolve removed 3454 rows and 0 columns
Presolve time: 0.31s
Presolved: 47737 rows, 50481 columns, 194803 nonzeros
Variable types: 50410 continuous, 71 integer (71 binary)

Root relaxation: objective 7.470365e+04, 9906 iterations, 1.74 seconds

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

     0     0 74703.6459    0    2          - 74703.6459     -      -    2s
H    0     0                    74798.000000 74703.6459  0.13%     -    2s
     0     0 74705.1160    0    4 74798.0000 74705.1160  0.12%     -    2s
     0     0 74705.1160    0    2 74798.0000 74705.1160  0.12%     -    3s
     0     0 74705.8293    0    4 74798.0000 74705.8293  0.12%     -    4s
     0     0 74705.8293    0    4 74798.0000 74705.8293  0.12%     -    4s
H    0     0                    74756.966851 74705.8293  0.07%     -    4s
H    0     0                    74744.000000 74705.8293  0.05%     -    4s
     0     1 74737.1510    0    2 74744.0000 74737.1510  0.01%     -    4s

Cutting planes:
  Gomory: 3
  Flow cover: 4

Explored 1 nodes (13138 simplex iterations) in 4.99 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.474400000000e+04, best bound 7.473715102389e+04, gap 0.0092%