Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:30:02 2013

Optimize a model with 35459 rows, 34869 columns and 139299 nonzeros
Presolve removed 3130 rows and 0 columns
Presolve time: 0.21s
Presolved: 32329 rows, 34869 columns, 133039 nonzeros
Variable types: 34810 continuous, 59 integer (59 binary)

Root relaxation: objective 6.775235e+04, 7429 iterations, 0.96 seconds

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

     0     0 67752.3451    0    2          - 67752.3451     -      -    1s
H    0     0                    68067.000000 67752.3451  0.46%     -    1s
H    0     0                    67808.000000 67752.3451  0.08%     -    1s
     0     0 67752.4915    0    4 67808.0000 67752.4915  0.08%     -    1s
     0     0 67752.4915    0    2 67808.0000 67752.4915  0.08%     -    2s
     0     0 67752.6957    0    4 67808.0000 67752.6957  0.08%     -    2s
     0     0     cutoff    0      67808.0000 67808.0000   0.0%     -    2s

Cutting planes:
  Flow cover: 3

Explored 0 nodes (10055 simplex iterations) in 2.52 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.780800000000e+04, best bound 6.780800000000e+04, gap 0.0%