Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:02:15 2013

Optimize a model with 19844 rows, 19404 columns and 77484 nonzeros
Presolve removed 2053 rows and 0 columns
Presolve time: 0.11s
Presolved: 17791 rows, 19404 columns, 73378 nonzeros
Variable types: 19360 continuous, 44 integer (44 binary)

Root relaxation: objective 3.978433e+04, 2431 iterations, 0.20 seconds

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

     0     0 39784.3261    0    2          - 39784.3261     -      -    0s
H    0     0                    40385.000000 39784.3261  1.49%     -    0s
H    0     0                    39912.000000 39784.3261  0.32%     -    0s
     0     0 39785.8872    0    4 39912.0000 39785.8872  0.32%     -    0s
H    0     0                    39870.000000 39785.8872  0.21%     -    0s
     0     0 39785.8872    0    2 39870.0000 39785.8872  0.21%     -    1s
     0     0 39785.8872    0    4 39870.0000 39785.8872  0.21%     -    1s
     0     2 39787.8650    0    4 39870.0000 39787.8650  0.21%     -    1s

Cutting planes:
  Gomory: 2
  Flow cover: 1

Explored 5 nodes (3777 simplex iterations) in 1.53 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.987000000000e+04, best bound 3.987000000000e+04, gap 0.0%