Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:56:37 2013

Optimize a model with 44286 rows, 43626 columns and 174306 nonzeros
Presolve removed 1382 rows and 0 columns
Presolve time: 0.25s
Presolved: 42904 rows, 43626 columns, 171542 nonzeros
Variable types: 43560 continuous, 66 integer (66 binary)

Root relaxation: objective 8.117380e+04, 8964 iterations, 1.47 seconds

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

     0     0 81173.8028    0    6          - 81173.8028     -      -    1s
H    0     0                    83769.000000 81173.8028  3.10%     -    1s
     0     0 81179.8730    0    7 83769.0000 81179.8730  3.09%     -    2s
     0     0 81186.0181    0    6 83769.0000 81186.0181  3.08%     -    2s
     0     0 81186.0664    0    8 83769.0000 81186.0664  3.08%     -    2s
H    0     0                    83401.000000 81186.0664  2.66%     -    2s
     0     0 81186.2090    0    6 83401.0000 81186.2090  2.66%     -    3s
H    0     0                    82807.279029 81186.2090  1.96%     -    4s
H    0     0                    82609.000000 81186.2090  1.72%     -    5s
     0     2 81186.9974    0    6 82609.0000 81186.9974  1.72%     -    5s
H    4     4                    82264.274685 81287.4700  1.19%   124    5s
H    5     5                    81513.937500 81287.4700  0.28%   112    5s
H    9     7                    81439.021505 81287.4700  0.19%   114    5s
H   10     7                    81423.145455 81287.4700  0.17%   108    5s
*   11     6              10    81385.000000 81287.4700  0.12%  98.8    5s

Cutting planes:
  Gomory: 3
  Flow cover: 14

Explored 24 nodes (11043 simplex iterations) in 6.36 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.138500000000e+04, best bound 8.137794285714e+04, gap 0.0087%