Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:58:53 2013

Optimize a model with 37881 rows, 3721 columns and 115351 nonzeros
Presolve removed 3025 rows and 1880 columns
Presolve time: 0.29s
Presolved: 34856 rows, 1841 columns, 106361 nonzeros
Variable types: 31 continuous, 1810 integer (1810 binary)
Found heuristic solution: objective 69280.000000

Root relaxation: objective 4.788484e+04, 10568 iterations, 0.75 seconds

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

     0     0 47884.8372    0   10 69280.0000 47884.8372  30.9%     -    1s
H    0     0                    47893.000000 47884.8372  0.02%     -    1s
H    0     0                    47892.000000 47884.8372  0.01%     -    1s
     0     0 47885.7323    0   30 47892.0000 47885.7323  0.01%     -    1s
     0     0 47885.7323    0   10 47892.0000 47885.7323  0.01%     -    1s
     0     0 47885.8394    0   31 47892.0000 47885.8394  0.01%     -    1s
     0     1 47885.8447    0   31 47892.0000 47885.8447  0.01%     -    1s
H   57    24                    47891.000000 47887.0524  0.01%  19.6    1s

Cutting planes:
  Gomory: 8
  MIR: 16
  Zero half: 2

Explored 57 nodes (11977 simplex iterations) in 1.83 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.789100000000e+04, best bound 4.788800000000e+04, gap 0.0063%