Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:19:44 2013

Optimize a model with 30855 rows, 30305 columns and 121055 nonzeros
Presolve removed 2766 rows and 0 columns
Presolve time: 0.17s
Presolved: 28089 rows, 30305 columns, 115523 nonzeros
Variable types: 30250 continuous, 55 integer (55 binary)

Root relaxation: objective 6.693611e+04, 6638 iterations, 0.86 seconds

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

     0     0 66936.1111    0    1          - 66936.1111     -      -    1s
H    0     0                    67424.000000 66936.1111  0.72%     -    1s
     0     0 66943.2000    0    2 67424.0000 66943.2000  0.71%     -    1s
     0     0 66943.2000    0    2 67424.0000 66943.2000  0.71%     -    1s
     0     2 66943.2953    0    2 67424.0000 66943.2953  0.71%     -    2s
*    2     2               2    66994.000000 66994.0000   0.0%  71.0    2s

Cutting planes:
  Gomory: 1
  Flow cover: 1

Explored 3 nodes (6829 simplex iterations) in 2.34 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.699400000000e+04, best bound 6.699400000000e+04, gap 0.0%