Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:04:22 2013

Optimize a model with 21666 rows, 21206 columns and 84686 nonzeros
Presolve removed 903 rows and 0 columns
Presolve time: 0.12s
Presolved: 20763 rows, 21206 columns, 82880 nonzeros
Variable types: 21160 continuous, 46 integer (46 binary)

Root relaxation: objective 5.459413e+04, 4061 iterations, 0.35 seconds

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

     0     0 54594.1282    0    2          - 54594.1282     -      -    0s
H    0     0                    54626.000000 54594.1282  0.06%     -    0s
     0     0 54609.8713    0    4 54626.0000 54609.8713  0.03%     -    0s
H    0     0                    54619.000000 54609.8713  0.02%     -    0s
     0     0 54610.5870    0    3 54619.0000 54610.5870  0.02%     -    0s
     0     0 54618.9048    0    1 54619.0000 54618.9048  0.00%     -    0s

Cutting planes:
  Gomory: 1
  Flow cover: 1

Explored 0 nodes (4154 simplex iterations) in 0.94 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.461900000000e+04, best bound 5.461890476190e+04, gap 0.0002%