Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:09:23 2013

Optimize a model with 47056 rows, 46376 columns and 185096 nonzeros
Presolve removed 68 rows and 0 columns
Presolve time: 0.21s
Presolved: 46988 rows, 46376 columns, 185028 nonzeros
Variable types: 46308 continuous, 68 integer (68 binary)

Root relaxation: objective 5.997950e+04, 6609 iterations, 4.52 seconds

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

     0     0 59979.5022    0   53          - 59979.5022     -      -    4s
H    0     0                    92746.000000 59979.5022  35.3%     -    7s
     0     0 78884.2338    0   14 92746.0000 78884.2338  14.9%     -   13s
H    0     0                    88688.000000 78884.2338  11.1%     -   13s
     0     0 80786.4998    0    6 88688.0000 80786.4998  8.91%     -   14s
H    0     0                    86487.000000 80786.4998  6.59%     -   14s
     0     0 81634.4274    0    2 86487.0000 81634.4274  5.61%     -   15s
H    0     0                    83708.547061 81634.4274  2.48%     -   15s
H    0     0                    83455.000000 81634.4274  2.18%     -   15s
H    0     0                    81796.000000 81634.4274  0.20%     -   15s
     0     0 81693.8344    0    4 81796.0000 81693.8344  0.12%     -   16s
     0     0 81708.2622    0    3 81796.0000 81708.2622  0.11%     -   16s
     0     0 81709.5642    0    2 81796.0000 81709.5642  0.11%     -   16s
     0     2 81711.2578    0    2 81796.0000 81711.2578  0.10%     -   17s

Cutting planes:
  Gomory: 2
  Implied bound: 66

Explored 3 nodes (15515 simplex iterations) in 17.34 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.179600000000e+04, best bound 8.179600000000e+04, gap 0.0%