Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:06:43 2013

Optimize a model with 46988 rows, 46308 columns and 185028 nonzeros
Presolve removed 2337 rows and 0 columns
Presolve time: 0.29s
Presolved: 44651 rows, 46308 columns, 180354 nonzeros
Variable types: 46240 continuous, 68 integer (68 binary)

Root relaxation: objective 8.163443e+04, 10106 iterations, 1.77 seconds

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

     0     0 81634.4274    0    2          - 81634.4274     -      -    2s
H    0     0                    83168.000000 81634.4274  1.84%     -    2s
H    0     0                    81796.000000 81634.4274  0.20%     -    2s
     0     0 81634.7119    0    3 81796.0000 81634.7119  0.20%     -    2s
     0     0 81634.7479    0    3 81796.0000 81634.7479  0.20%     -    2s
     0     0 81693.8344    0    4 81796.0000 81693.8344  0.12%     -    3s
     0     0 81708.2622    0    3 81796.0000 81708.2622  0.11%     -    3s
     0     0 81709.5642    0    2 81796.0000 81709.5642  0.11%     -    3s
     0     0 81709.5642    0    2 81796.0000 81709.5642  0.11%     -    4s
     0     0 81710.1944    0    3 81796.0000 81710.1944  0.10%     -    5s
     0     0 81710.6091    0    3 81796.0000 81710.6091  0.10%     -    5s
     0     0     cutoff    0      81796.0000 81796.0000   0.0%     -    5s

Cutting planes:
  Gomory: 1
  Flow cover: 2

Explored 0 nodes (12476 simplex iterations) in 5.32 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%