Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:48:38 2013

Optimize a model with 55648 rows, 54908 columns and 219188 nonzeros
Presolve removed 74 rows and 0 columns
Presolve time: 0.25s
Presolved: 55574 rows, 54908 columns, 219114 nonzeros
Variable types: 54834 continuous, 74 integer (74 binary)

Root simplex log...

Iteration    Objective       Primal Inf.    Dual Inf.      Time
    6987    6.0055620e+04   2.542683e+03   0.000000e+00      5s
    7245    6.0071961e+04   0.000000e+00   0.000000e+00      6s

Root relaxation: objective 6.007196e+04, 7245 iterations, 5.53 seconds

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

     0     0 60071.9607    0   56          - 60071.9607     -      -    6s
H    0     0                    100055.00000 60071.9607  40.0%     -    9s
     0     0 73886.9758    0   14 100055.000 73886.9758  26.2%     -   16s
H    0     0                    96152.090932 73886.9758  23.2%     -   16s
H    0     0                    82597.000000 73886.9758  10.5%     -   17s
     0     0 77128.6098    0   10 82597.0000 77128.6098  6.62%     -   18s
     0     0 77974.8686    0    4 82597.0000 77974.8686  5.60%     -   19s
     0     0 78133.5519    0    4 82597.0000 78133.5519  5.40%     -   20s
H    0     0                    78665.000000 78133.5519  0.68%     -   20s
     0     0 78134.0513    0    4 78665.0000 78134.0513  0.67%     -   20s
     0     2 78158.5208    0    4 78665.0000 78158.5208  0.64%     -   21s
*    9     7               8    78411.000000 78231.0543  0.23%   241   23s

Cutting planes:
  Gomory: 1
  Implied bound: 74

Explored 23 nodes (19409 simplex iterations) in 24.03 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.841100000000e+04, best bound 7.841100000000e+04, gap 0.0%