Gurobi 5.0.1 (linux64) logging started Sat Dec  8 03:30:11 2012

Optimize a model with 825 rows, 810 columns and 2959 nonzeros
Presolve removed 69 rows and 22 columns
Presolve time: 0.01s
Presolved: 756 rows, 788 columns, 2826 nonzeros
Variable types: 701 continuous, 87 integer (87 binary)

Root relaxation: objective 3.101079e+04, 243 iterations, 0.00 seconds

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

     0     0 31010.7914    0   24          - 31010.7914     -      -    0s
     0     0 31183.9507    0   30          - 31183.9507     -      -    0s
     0     0 31199.0819    0   36          - 31199.0819     -      -    0s
     0     0 31214.7585    0   38          - 31214.7585     -      -    0s
     0     0 31215.3292    0   36          - 31215.3292     -      -    0s
     0     2 31219.7532    0   36          - 31219.7532     -      -    0s
*  939   473              60    34127.000000 31608.6232  7.38%  15.5    1s
H 2171   861                    34018.000000 31847.0050  6.38%  13.5    1s
H 2198   676                    33430.000000 31848.7563  4.73%  13.5    1s
  7225  2114 33287.6324   23   20 33430.0000 32321.3331  3.32%  12.7    5s
H 8924  2285                    33334.000000 32411.2235  2.77%  12.6    6s
 16975  2404 33213.0341   26   17 33334.0000 32787.8881  1.64%  12.0   10s

Cutting planes:
  Gomory: 1
  Cover: 1
  Flow cover: 9

Explored 23335 nodes (262852 simplex iterations) in 12.74 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.333400000000e+04, best bound 3.333154863613e+04, gap 0.0074%