Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:03:16 2013

Optimize a model with 20745 rows, 20295 columns and 81045 nonzeros
Presolve removed 3033 rows and 0 columns
Presolve time: 0.12s
Presolved: 17712 rows, 20295 columns, 74979 nonzeros
Variable types: 20250 continuous, 45 integer (45 binary)

Root relaxation: objective 4.764241e+04, 3115 iterations, 0.23 seconds

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

     0     0 47642.4149    0    3          - 47642.4149     -      -    0s
H    0     0                    47681.000000 47642.4149  0.08%     -    0s
H    0     0                    47670.000000 47642.4149  0.06%     -    0s
     0     0 47647.3742    0    3 47670.0000 47647.3742  0.05%     -    0s
     0     0 47647.3742    0    2 47670.0000 47647.3742  0.05%     -    0s
     0     0 47647.5795    0    3 47670.0000 47647.5795  0.05%     -    0s
     0     0 47647.5795    0    3 47670.0000 47647.5795  0.05%     -    0s
     0     0 47648.6533    0    2 47670.0000 47648.6533  0.04%     -    1s
     0     0 47649.0000    0    1 47670.0000 47649.0000  0.04%     -    1s
     0     2 47649.7099    0    1 47670.0000 47649.7099  0.04%     -    1s
*    2     0               1    47663.000000 47663.0000   0.0%  31.0    1s

Cutting planes:
  Gomory: 2
  Flow cover: 3

Explored 3 nodes (4438 simplex iterations) in 1.11 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.766300000000e+04, best bound 4.766300000000e+04, gap 0.0%