Gurobi 5.0.1 (linux64) logging started Fri Jan 18 06:07:57 2013

Optimize a model with 1600 rows, 50600 columns and 326550 nonzeros
Presolve removed 50 rows and 50 columns
Presolve time: 0.46s
Presolved: 1550 rows, 50550 columns, 301500 nonzeros
Variable types: 50100 continuous, 450 integer (450 binary)

Root relaxation: objective 1.715514e+05, 3245 iterations, 0.17 seconds

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

     0     0 171551.420    0    6          - 171551.420     -      -    0s
     0     0 171551.782    0    6          - 171551.782     -      -    1s
     0     0 171551.782    0    6          - 171551.782     -      -    1s
     0     0 171551.782    0    6          - 171551.782     -      -    1s
     0     0 171551.782    0    6          - 171551.782     -      -    1s
H    0     0                    171614.67568 171551.782  0.04%     -    1s
     0     1 171569.326    0    3 171614.676 171569.326  0.03%     -    2s
*    6     0               6    171584.76124 171584.761   0.0%  32.3    2s

Cutting planes:
  Flow cover: 4

Explored 7 nodes (3956 simplex iterations) in 2.48 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 1.715847612416e+05, best bound 1.715847612416e+05, gap 0.0%