Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:56:55 2013

Optimize a model with 30913 rows, 3249 columns and 94221 nonzeros
Presolve removed 3911 rows and 1672 columns
Presolve time: 0.20s
Presolved: 27002 rows, 1577 columns, 82410 nonzeros
Variable types: 26 continuous, 1551 integer (1551 binary)
Found heuristic solution: objective 69116.000000

Root relaxation: objective 5.004373e+04, 11346 iterations, 0.75 seconds

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

     0     0 50043.7273    0   17 69116.0000 50043.7273  27.6%     -    1s
H    0     0                    50059.000000 50043.7273  0.03%     -    1s
     0     0 50043.7273    0   18 50059.0000 50043.7273  0.03%     -    1s
     0     0 50043.7273    0   12 50059.0000 50043.7273  0.03%     -    1s
H    0     0                    50056.000000 50043.7273  0.02%     -    1s
     0     0 50043.7273    0   23 50056.0000 50043.7273  0.02%     -    1s
H    0     0                    50054.000000 50043.7273  0.02%     -    1s
     0     2 50043.7273    0   20 50054.0000 50043.7273  0.02%     -    1s
H    3     3                    50051.000000 50043.7273  0.01%  35.0    1s
H  882   415                    50049.000000 50043.7273  0.01%  25.9    3s
  1479   743     cutoff   55      50049.0000 50043.7483  0.01%  29.3    5s

Cutting planes:
  Gomory: 8
  Cover: 7
  Clique: 1
  MIR: 72
  GUB cover: 5
  Zero half: 23
  Mod-K: 1

Explored 4051 nodes (121380 simplex iterations) in 7.60 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.004900000000e+04, best bound 5.004400000000e+04, gap 0.0100%