Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:44:44 2013

Optimize a model with 680 rows, 45200 columns and 528420 nonzeros
Presolve removed 20 rows and 980 columns
Presolve time: 1.45s
Presolved: 660 rows, 44220 columns, 488420 nonzeros
Variable types: 44020 continuous, 200 integer (200 binary)

Root relaxation: objective 3.894400e+04, 572 iterations, 0.06 seconds

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

     0     0 38944.0027    0   16          - 38944.0027     -      -    1s
     0     0 38944.6301    0   16          - 38944.6301     -      -    2s
     0     0 38944.6716    0   16          - 38944.6716     -      -    2s
     0     0 38944.7034    0   16          - 38944.7034     -      -    2s
     0     0 38944.7034    0   16          - 38944.7034     -      -    2s
     0     2 38944.9919    0   16          - 38944.9919     -      -    8s
*   87    62              73    39395.551597 38959.2049  1.11%   6.3    9s
H  116    22                    39262.201874 38997.0228  0.68%   7.3    9s
*  127    23              20    39251.621136 38997.0228  0.65%   6.9    9s
   131    20 39170.0405    2    7 39251.6211 39005.9834  0.63%   7.2   10s
H  143    18                    39247.138434 39029.6558  0.55%   7.4   10s

Cutting planes:
  Flow cover: 6

Explored 209 nodes (2729 simplex iterations) in 11.26 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.924713843363e+04, best bound 3.924713843363e+04, gap 0.0%