Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:27:33 2013

Optimize a model with 51262 rows, 50552 columns and 201782 nonzeros
Presolve removed 71 rows and 0 columns
Presolve time: 0.23s
Presolved: 51191 rows, 50552 columns, 201711 nonzeros
Variable types: 50481 continuous, 71 integer (71 binary)

Root relaxation: objective 5.887315e+04, 6365 iterations, 4.56 seconds
Total elapsed time = 5.02s

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

     0     0 58873.1532    0   57          - 58873.1532     -      -    5s
H    0     0                    95951.000000 58873.1532  38.6%     -    8s
     0     0 78909.0917    0    7 95951.0000 78909.0917  17.8%     -   15s
H    0     0                    87086.004576 78909.0917  9.39%     -   15s
H    0     0                    84679.000000 78909.0917  6.81%     -   15s
     0     0 80540.4691    0    7 84679.0000 80540.4691  4.89%     -   16s
H    0     0                    84239.000000 80540.4691  4.39%     -   16s
     0     0 80623.3355    0    4 84239.0000 80623.3355  4.29%     -   16s
H    0     0                    84116.983344 80623.3355  4.15%     -   16s
H    0     0                    83671.000000 80623.3355  3.64%     -   16s
H    0     0                    80843.000000 80623.3355  0.27%     -   17s
     0     0 80626.7086    0    3 80843.0000 80626.7086  0.27%     -   17s
     0     2 80643.0474    0    3 80843.0000 80643.0474  0.25%     -   18s
*    4     4               4    80747.000000 80686.7224  0.07%   191   18s
*    8     0               3    80721.000000 80721.0000   0.0%   164   19s

Cutting planes:
  Implied bound: 65

Explored 9 nodes (15105 simplex iterations) in 19.27 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.072100000000e+04, best bound 8.072100000000e+04, gap 0.0%