Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:03:17 2013

Optimize a model with 20745 rows, 20295 columns and 81045 nonzeros
Presolve removed 1699 rows and 0 columns
Presolve time: 0.12s
Presolved: 19046 rows, 20295 columns, 77647 nonzeros
Variable types: 20250 continuous, 45 integer (45 binary)

Root relaxation: objective 4.719293e+04, 3184 iterations, 0.29 seconds

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

     0     0 47192.9332    0    5          - 47192.9332     -      -    0s
H    0     0                    47835.000000 47192.9332  1.34%     -    0s
H    0     0                    47834.000000 47192.9332  1.34%     -    0s
H    0     0                    47375.000000 47192.9332  0.38%     -    0s
     0     0 47193.6718    0    6 47375.0000 47193.6718  0.38%     -    0s
     0     0 47193.6718    0    6 47375.0000 47193.6718  0.38%     -    0s
     0     0 47193.6718    0    6 47375.0000 47193.6718  0.38%     -    0s
     0     0 47201.0132    0    5 47375.0000 47201.0132  0.37%     -    1s
     0     2 47204.6938    0    5 47375.0000 47204.6938  0.36%     -    1s

Cutting planes:
  Gomory: 1
  Flow cover: 2

Explored 6 nodes (3624 simplex iterations) in 1.60 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.737500000000e+04, best bound 4.737276470588e+04, gap 0.0047%