Gurobi 5.0.1 (linux64) logging started Wed Apr 24 03:17:47 2013

Optimize a model with 61698 rows, 60918 columns and 243438 nonzeros
Presolve removed 5630 rows and 0 columns
Presolve time: 0.41s
Presolved: 56068 rows, 60918 columns, 232178 nonzeros
Variable types: 60840 continuous, 78 integer (78 binary)

Root relaxation: objective 8.774280e+04, 11512 iterations, 2.35 seconds

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

     0     0 87742.8048    0    5          - 87742.8048     -      -    2s
H    0     0                    90462.000000 87742.8048  3.01%     -    3s
H    0     0                    89445.000000 87742.8048  1.90%     -    3s
     0     0 87742.8401    0    6 89445.0000 87742.8401  1.90%     -    3s
H    0     0                    89444.000000 87742.8401  1.90%     -    3s
H    0     0                    89010.497459 87742.8401  1.42%     -    5s
     0     0 87742.8401    0    5 89010.4975 87742.8401  1.42%     -    8s
     0     0 87742.8407    0    6 89010.4975 87742.8407  1.42%     -    9s
     0     0 87742.8407    0    6 89010.4975 87742.8407  1.42%     -    9s
H    0     0                    88679.000000 87742.8407  1.06%     -   10s
     0     2 87764.9419    0    6 88679.0000 87764.9419  1.03%     -   11s
*    8     7               5    88479.000000 88147.1557  0.38%   273   12s
H   20    12                    88474.878049 88164.0050  0.35%   162   13s
*   21    10              11    88342.000000 88164.0050  0.20%   156   13s
H   29     2                    88335.000000 88236.2756  0.11%   150   14s

Cutting planes:
  Gomory: 1
  Flow cover: 2

Explored 39 nodes (24512 simplex iterations) in 14.51 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.833500000000e+04, best bound 8.833500000000e+04, gap 0.0%