Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:03:11 2013

Optimize a model with 20745 rows, 20295 columns and 81045 nonzeros
Presolve removed 1405 rows and 0 columns
Presolve time: 0.12s
Presolved: 19340 rows, 20295 columns, 78235 nonzeros
Variable types: 20250 continuous, 45 integer (45 binary)

Root relaxation: objective 4.768753e+04, 3617 iterations, 0.35 seconds

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

     0     0 47687.5336    0    3          - 47687.5336     -      -    0s
H    0     0                    47949.000000 47687.5336  0.55%     -    0s
H    0     0                    47798.000000 47687.5336  0.23%     -    0s
     0     0 47697.3419    0    4 47798.0000 47697.3419  0.21%     -    0s
     0     0 47698.5743    0    4 47798.0000 47698.5743  0.21%     -    0s
     0     0 47698.5743    0    4 47798.0000 47698.5743  0.21%     -    0s
     0     0 47698.6349    0    5 47798.0000 47698.6349  0.21%     -    1s
     0     0 47698.8080    0    4 47798.0000 47698.8080  0.21%     -    1s
     0     0 47698.8124    0    4 47798.0000 47698.8124  0.21%     -    1s
     0     0 47795.3066    0    2 47798.0000 47795.3066  0.01%     -    1s

Cutting planes:
  Gomory: 1
  Flow cover: 9

Explored 0 nodes (3782 simplex iterations) in 1.31 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.779800000000e+04, best bound 4.779530655462e+04, gap 0.0056%