Gurobi 5.0.1 (linux64) logging started Fri Jan 18 08:06:37 2013

Optimize a model with 50800 rows, 125150 columns and 400250 nonzeros
Presolve removed 50 rows and 50 columns
Presolve time: 1.02s
Presolved: 50750 rows, 125100 columns, 350200 nonzeros
Variable types: 75100 continuous, 50000 integer (50000 binary)

Root relaxation: objective 1.715514e+05, 4824 iterations, 0.37 seconds

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

     0     0 171551.420    0    4          - 171551.420     -      -    3s
     0     0 171556.781    0    2          - 171556.781     -      -    4s
     0     0 171556.942    0    2          - 171556.942     -      -    4s
     0     0 171558.058    0    2          - 171558.058     -      -    5s
     0     0 171558.069    0    2          - 171558.069     -      -    5s
     0     0 171558.081    0    2          - 171558.081     -      -    5s
     0     0 171558.114    0    3          - 171558.114     -      -    6s
     0     0 171558.114    0    3          - 171558.114     -      -    6s
H    0     0                    171619.19391 171558.114  0.04%     -    7s
     0     1 171559.457    0    2 171619.194 171559.457  0.03%     -    8s
    26     1 171569.797   26    2 171619.194 171569.797  0.03%  16.8   10s
    94     1 171577.672   94    2 171619.194 171577.672  0.02%   6.1   15s
   161     1 171581.403  161    2 171619.194 171581.403  0.02%   4.4   20s
   224     1 171583.822  224    2 171619.194 171583.822  0.02%   3.7   25s
*  254     0             254    171584.76124 171584.761   0.0%   3.5   28s

Cutting planes:
  Implied bound: 14
  Flow cover: 1

Explored 255 nodes (6703 simplex iterations) in 28.45 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%