Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:01:40 2013

Optimize a model with 45627 rows, 44957 columns and 179627 nonzeros
Presolve removed 1180 rows and 0 columns
Presolve time: 0.27s
Presolved: 44447 rows, 44957 columns, 177267 nonzeros
Variable types: 44890 continuous, 67 integer (67 binary)

Root relaxation: objective 7.435201e+04, 9548 iterations, 1.54 seconds

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

     0     0 74352.0066    0    5          - 74352.0066     -      -    1s
H    0     0                    75940.000000 74352.0066  2.09%     -    2s
H    0     0                    74711.000000 74352.0066  0.48%     -    2s
     0     0 74362.9834    0    7 74711.0000 74362.9834  0.47%     -    2s
     0     0 74362.9952    0    7 74711.0000 74362.9952  0.47%     -    2s
     0     0 74362.9952    0    7 74711.0000 74362.9952  0.47%     -    3s
     0     0 74434.1254    0    5 74711.0000 74434.1254  0.37%     -    3s
     0     0 74434.1254    0    4 74711.0000 74434.1254  0.37%     -    5s
     0     0 74438.3232    0    7 74711.0000 74438.3232  0.36%     -    5s
     0     0 74438.3382    0    7 74711.0000 74438.3382  0.36%     -    5s
     0     0 74438.3382    0    7 74711.0000 74438.3382  0.36%     -    6s
     0     0 74439.1384    0    6 74711.0000 74439.1384  0.36%     -    6s
     0     2 74457.0950    0    6 74711.0000 74457.0950  0.34%     -    6s

Cutting planes:
  Gomory: 2
  Flow cover: 4

Explored 4 nodes (13724 simplex iterations) in 7.06 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.471100000000e+04, best bound 7.470360810811e+04, gap 0.0099%