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

Optimize a model with 19888 rows, 19448 columns and 77528 nonzeros
Presolve removed 44 rows and 0 columns
Presolve time: 0.08s
Presolved: 19844 rows, 19448 columns, 77484 nonzeros
Variable types: 19404 continuous, 44 integer (44 binary)

Root relaxation: objective 4.326123e+04, 3439 iterations, 0.95 seconds

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

     0     0 43261.2344    0   36          - 43261.2344     -      -    1s
H    0     0                    55144.000000 43261.2344  21.5%     -    1s
     0     0 51273.7001    0    3 55144.0000 51273.7001  7.02%     -    2s
H    0     0                    52761.928365 51273.7001  2.82%     -    2s
H    0     0                    52619.000000 51273.7001  2.56%     -    2s
H    0     0                    51344.000000 51273.7001  0.14%     -    2s
     0     0 51339.5000    0    1 51344.0000 51339.5000  0.01%     -    2s

Cutting planes:
  Implied bound: 35

Explored 0 nodes (4895 simplex iterations) in 2.44 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.134400000000e+04, best bound 5.133950000000e+04, gap 0.0088%