Gurobi 5.0.1 (linux64) logging started Mon Feb  4 19:04:51 2013

Optimize a model with 62268 rows, 5184 columns and 189216 nonzeros
Presolve removed 4645 rows and 2625 columns
Presolve time: 0.51s
Presolved: 57623 rows, 2559 columns, 175140 nonzeros
Variable types: 33 continuous, 2526 integer (2526 binary)
Found heuristic solution: objective 108591.00000

Root relaxation: objective 8.131668e+04, 19584 iterations, 1.89 seconds

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

     0     0 81316.6842    0   11 108591.000 81316.6842  25.1%     -    2s
H    0     0                    81343.000000 81316.6842  0.03%     -    2s
H    0     0                    81339.000000 81316.6842  0.03%     -    2s
H    0     0                    81328.000000 81316.6842  0.01%     -    2s
     0     0 81316.6842    0   27 81328.0000 81316.6842  0.01%     -    2s
     0     0 81316.6842    0   11 81328.0000 81316.6842  0.01%     -    3s
     0     0 81316.6842    0   24 81328.0000 81316.6842  0.01%     -    3s
     0     2 81316.6842    0   21 81328.0000 81316.6842  0.01%     -    3s
H    3     4                    81327.000000 81316.6842  0.01%  21.7    3s

Cutting planes:
  Gomory: 10
  Implied bound: 3
  MIR: 31
  Zero half: 15

Explored 505 nodes (31052 simplex iterations) in 4.42 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.132700000000e+04, best bound 8.131900000000e+04, gap 0.0098%