Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:54:22 2013

Optimize a model with 18472 rows, 2304 columns and 56448 nonzeros
Presolve removed 1866 rows and 1170 columns
Presolve time: 0.12s
Presolved: 16606 rows, 1134 columns, 50807 nonzeros
Variable types: 22 continuous, 1112 integer (1112 binary)
Found heuristic solution: objective 43429.000000

Root relaxation: objective 3.223890e+04, 4409 iterations, 0.24 seconds

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

     0     0 32238.9000    0   13 43429.0000 32238.9000  25.8%     -    0s
H    0     0                    32265.000000 32238.9000  0.08%     -    0s
H    0     0                    32256.000000 32238.9000  0.05%     -    0s
H    0     0                    32249.000000 32238.9000  0.03%     -    0s
     0     0 32239.0000    0   25 32249.0000 32239.0000  0.03%     -    0s
     0     0 32239.0000    0   14 32249.0000 32239.0000  0.03%     -    0s
     0     0 32239.0000    0   25 32249.0000 32239.0000  0.03%     -    0s
H    0     0                    32244.000000 32239.0000  0.02%     -    0s
     0     1 32239.0000    0   19 32244.0000 32239.0000  0.02%     -    0s
H  889   296                    32243.000000 32239.9150  0.01%  24.1    1s

Cutting planes:
  Gomory: 12
  Cover: 15
  MIR: 56
  GUB cover: 2
  Zero half: 14

Explored 889 nodes (28387 simplex iterations) in 1.81 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.224300000000e+04, best bound 3.224000000000e+04, gap 0.0093%