Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:06:19 2013

Optimize a model with 46988 rows, 46308 columns and 185028 nonzeros
Presolve removed 3278 rows and 0 columns
Presolve time: 0.28s
Presolved: 43710 rows, 46308 columns, 178472 nonzeros
Variable types: 46240 continuous, 68 integer (68 binary)

Root relaxation: objective 6.917465e+04, 7561 iterations, 1.28 seconds

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

     0     0 69174.6498    0    6          - 69174.6498     -      -    1s
H    0     0                    70594.000000 69174.6498  2.01%     -    1s
H    0     0                    69523.000000 69174.6498  0.50%     -    2s
     0     0 69180.4095    0    8 69523.0000 69180.4095  0.49%     -    2s
     0     0 69180.4796    0    9 69523.0000 69180.4796  0.49%     -    2s
     0     0 69180.5604    0    8 69523.0000 69180.5604  0.49%     -    2s
     0     0 69182.1514    0    7 69523.0000 69182.1514  0.49%     -    3s
H    0     0                    69404.767123 69182.1514  0.32%     -    4s
H    0     0                    69346.000000 69182.1514  0.24%     -    4s
     0     0 69290.5793    0    3 69346.0000 69290.5793  0.08%     -    5s
     0     0 69291.0475    0    4 69346.0000 69291.0475  0.08%     -    5s
     0     0 69291.1040    0    4 69346.0000 69291.1040  0.08%     -    5s
     0     0 69291.1380    0    4 69346.0000 69291.1380  0.08%     -    6s
     0     0     cutoff    0      69346.0000 69346.0000   0.0%     -    6s

Cutting planes:
  Gomory: 1
  Flow cover: 3

Explored 0 nodes (10859 simplex iterations) in 6.30 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.934600000000e+04, best bound 6.934600000000e+04, gap 0.0%