Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:12:41 2013

Optimize a model with 48369 rows, 47679 columns and 190509 nonzeros
Presolve removed 1936 rows and 0 columns
Presolve time: 0.29s
Presolved: 46433 rows, 47679 columns, 186637 nonzeros
Variable types: 47610 continuous, 69 integer (69 binary)

Root relaxation: objective 7.491294e+04, 8626 iterations, 1.53 seconds

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

     0     0 74912.9403    0    4          - 74912.9403     -      -    1s
H    0     0                    75806.000000 74912.9403  1.18%     -    2s
H    0     0                    75209.000000 74912.9403  0.39%     -    2s
     0     0 74915.1344    0    6 75209.0000 74915.1344  0.39%     -    2s
     0     0 74915.1376    0    6 75209.0000 74915.1376  0.39%     -    2s
H    0     0                    75070.000000 74915.1376  0.21%     -    4s
     0     0 74915.4342    0    3 75070.0000 74915.4342  0.21%     -    5s
     0     0 74918.8419    0    5 75070.0000 74918.8419  0.20%     -    5s
     0     0 74918.8515    0    5 75070.0000 74918.8515  0.20%     -    5s
     0     0 74920.6956    0    4 75070.0000 74920.6956  0.20%     -    6s
     0     2 74931.3472    0    4 75070.0000 74931.3472  0.18%     -    6s

Cutting planes:
  Gomory: 1
  Flow cover: 7

Explored 9 nodes (12336 simplex iterations) in 6.75 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.507000000000e+04, best bound 7.507000000000e+04, gap 0.0%