Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:24:36 2013

Optimize a model with 33117 rows, 32547 columns and 130017 nonzeros
Presolve removed 1688 rows and 0 columns
Presolve time: 0.19s
Presolved: 31429 rows, 32547 columns, 126641 nonzeros
Variable types: 32490 continuous, 57 integer (57 binary)

Root relaxation: objective 5.507904e+04, 5516 iterations, 0.69 seconds

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

     0     0 55079.0409    0    3          - 55079.0409     -      -    0s
H    0     0                    55616.000000 55079.0409  0.97%     -    1s
     0     0 55087.8214    0    4 55616.0000 55087.8214  0.95%     -    1s
H    0     0                    55518.000000 55087.8214  0.77%     -    1s
     0     0 55087.8214    0    4 55518.0000 55087.8214  0.77%     -    1s
H    0     0                    55355.000000 55087.8214  0.48%     -    1s
     0     0 55087.8214    0    4 55355.0000 55087.8214  0.48%     -    1s
     0     0 55087.8214    0    3 55355.0000 55087.8214  0.48%     -    3s
     0     0 55087.8214    0    4 55355.0000 55087.8214  0.48%     -    3s
     0     0 55087.8214    0    4 55355.0000 55087.8214  0.48%     -    3s
     0     2 55096.2089    0    4 55355.0000 55096.2089  0.47%     -    3s
H    5     5                    55331.600000 55194.9545  0.25%  53.0    4s
H    7     5                    55305.800000 55194.9545  0.20%  47.4    4s
*    8     3               7    55261.000000 55194.9545  0.12%  44.9    4s
*   14     3               5    55257.000000 55221.1995  0.06%  44.6    4s

Cutting planes:
  Gomory: 3
  Flow cover: 4

Explored 20 nodes (8721 simplex iterations) in 4.28 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.525700000000e+04, best bound 5.525700000000e+04, gap 0.0%