Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:09:59 2013

Optimize a model with 24598 rows, 24108 columns and 96138 nonzeros
Presolve removed 49 rows and 0 columns
Presolve time: 0.11s
Presolved: 24549 rows, 24108 columns, 96089 nonzeros
Variable types: 24059 continuous, 49 integer (49 binary)

Root relaxation: objective 4.749869e+04, 3904 iterations, 1.31 seconds

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

     0     0 47498.6901    0   42          - 47498.6901     -      -    1s
H    0     0                    64310.000000 47498.6901  26.1%     -    2s
     0     0 56641.6306    0    2 64310.0000 56641.6306  11.9%     -    4s
H    0     0                    58747.226415 56641.6306  3.58%     -    4s
H    0     0                    58028.000000 56641.6306  2.39%     -    4s
H    0     0                    57159.000000 56641.6306  0.91%     -    4s
     0     0 56819.3129    0    4 57159.0000 56819.3129  0.59%     -    4s
H    0     0                    56877.000000 56819.3129  0.10%     -    4s
     0     0 56845.2493    0    3 56877.0000 56845.2493  0.06%     -    4s
H    0     0                    56861.000000 56845.2493  0.03%     -    4s
     0     0     cutoff    0      56861.0000 56861.0000   0.0%     -    4s

Cutting planes:
  Gomory: 2
  Implied bound: 42

Explored 0 nodes (6892 simplex iterations) in 4.91 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.686100000000e+04, best bound 5.686100000000e+04, gap 0.0%