Gurobi 5.0.1 (linux64) logging started Sat Dec  8 02:36:13 2012

Optimize a model with 825 rows, 810 columns and 2966 nonzeros
Presolve removed 75 rows and 17 columns
Presolve time: 0.00s
Presolved: 750 rows, 793 columns, 2839 nonzeros
Variable types: 707 continuous, 86 integer (86 binary)

Root relaxation: objective 3.117108e+04, 172 iterations, 0.00 seconds

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

     0     0 31171.0823    0   17          - 31171.0823     -      -    0s
H    0     0                    33342.000000 31171.0823  6.51%     -    0s
     0     0 31253.9528    0   20 33342.0000 31253.9528  6.26%     -    0s
     0     0 31271.2074    0   24 33342.0000 31271.2074  6.21%     -    0s
     0     0 31280.4604    0   23 33342.0000 31280.4604  6.18%     -    0s
     0     0 31305.0681    0   22 33342.0000 31305.0681  6.11%     -    0s
     0     0 31305.5422    0   22 33342.0000 31305.5422  6.11%     -    0s
     0     2 31316.2314    0   22 33342.0000 31316.2314  6.08%     -    0s
H   33    29                    33081.000000 31453.1660  4.92%   7.1    0s
*   77    46              29    32748.000000 31487.2834  3.85%   6.7    0s
H   87    30                    31949.000000 31491.3109  1.43%   7.1    0s
H  114    32                    31914.000000 31522.0377  1.23%   7.7    0s

Cutting planes:
  Gomory: 3
  Cover: 3
  Implied bound: 2
  Flow cover: 19

Explored 485 nodes (3072 simplex iterations) in 0.23 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.191400000000e+04, best bound 3.191400000000e+04, gap 0.0%