Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:07:40 2013

Optimize a model with 23616 rows, 23136 columns and 92256 nonzeros
Presolve removed 48 rows and 0 columns
Presolve time: 0.11s
Presolved: 23568 rows, 23136 columns, 92208 nonzeros
Variable types: 23088 continuous, 48 integer (48 binary)

Root relaxation: objective 4.876053e+04, 3905 iterations, 1.32 seconds

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

     0     0 48760.5315    0   36          - 48760.5315     -      -    1s
H    0     0                    59788.000000 48760.5315  18.4%     -    2s
     0     0 56149.5331    0    2 59788.0000 56149.5331  6.09%     -    2s
H    0     0                    58483.504779 56149.5331  3.99%     -    2s
H    0     0                    58010.000000 56149.5331  3.21%     -    2s
H    0     0                    56152.000000 56149.5331  0.00%     -    2s

Cutting planes:
  Implied bound: 36

Explored 0 nodes (5179 simplex iterations) in 2.81 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.615200000000e+04, best bound 5.614953309859e+04, gap 0.0044%