Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:58:38 2013

Optimize a model with 37881 rows, 3721 columns and 115351 nonzeros
Presolve removed 6838 rows and 1964 columns
Presolve time: 0.27s
Presolved: 31043 rows, 1757 columns, 94052 nonzeros
Variable types: 16 continuous, 1741 integer (1741 binary)
Found heuristic solution: objective 88304.000000

Root relaxation: objective 7.514970e+04, 5740 iterations, 0.39 seconds

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

     0     0 75149.6964    0    6 88304.0000 75149.6964  14.9%     -    0s
H    0     0                    75163.000000 75149.6964  0.02%     -    0s
H    0     0                    75159.000000 75149.6964  0.01%     -    0s
     0     0 75152.2361    0   12 75159.0000 75152.2361  0.01%     -    0s

Cutting planes:
  Gomory: 4
  Implied bound: 1
  MIR: 5

Explored 0 nodes (5805 simplex iterations) in 0.91 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.515900000000e+04, best bound 7.515300000000e+04, gap 0.0080%