Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:17:35 2013

Optimize a model with 48438 rows, 47748 columns and 190578 nonzeros
Presolve removed 69 rows and 0 columns
Presolve time: 0.21s
Presolved: 48369 rows, 47748 columns, 190509 nonzeros
Variable types: 47679 continuous, 69 integer (69 binary)

Root relaxation: objective 6.346268e+04, 6241 iterations, 3.77 seconds

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

     0     0 63462.6757    0   54          - 63462.6757     -      -    4s
H    0     0                    99481.000000 63462.6757  36.2%     -    6s
     0     0 79219.0954    0   12 99481.0000 79219.0954  20.4%     -   12s
H    0     0                    96023.962434 79219.0954  17.5%     -   13s
H    0     0                    87777.000000 79219.0954  9.75%     -   13s
     0     0 80969.7315    0   12 87777.0000 80969.7315  7.76%     -   14s
H    0     0                    83602.000000 80969.7315  3.15%     -   14s
     0     0 81303.1157    0    9 83602.0000 81303.1157  2.75%     -   15s
     0     0 81369.2299    0    5 83602.0000 81369.2299  2.67%     -   16s
H    0     0                    83272.598554 81369.2299  2.29%     -   17s
H    0     0                    82546.773554 81369.2299  1.43%     -   17s
H    0     0                    81617.000000 81369.2299  0.30%     -   17s
     0     2 81372.4517    0    5 81617.0000 81372.4517  0.30%     -   18s
     6     6 81555.8000    5    1 81617.0000 81527.4147  0.11%   226   20s

Cutting planes:
  Implied bound: 65

Explored 28 nodes (17393 simplex iterations) in 21.07 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.161700000000e+04, best bound 8.160900000000e+04, gap 0.0098%