Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:07:31 2013

Optimize a model with 46988 rows, 46308 columns and 185028 nonzeros
Presolve removed 2159 rows and 0 columns
Presolve time: 0.28s
Presolved: 44829 rows, 46308 columns, 180710 nonzeros
Variable types: 46240 continuous, 68 integer (68 binary)

Root relaxation: objective 7.164883e+04, 9039 iterations, 1.45 seconds

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

     0     0 71648.8331    0    3          - 71648.8331     -      -    1s
H    0     0                    72897.000000 71648.8331  1.71%     -    2s
H    0     0                    72709.000000 71648.8331  1.46%     -    2s
     0     0 71662.7845    0    3 72709.0000 71662.7845  1.44%     -    2s
     0     0 71662.7905    0    3 72709.0000 71662.7905  1.44%     -    2s
     0     0 71662.8150    0    4 72709.0000 71662.8150  1.44%     -    3s
     0     0 71662.8150    0    4 72709.0000 71662.8150  1.44%     -    3s
     0     2 71662.9670    0    4 72709.0000 71662.9670  1.44%     -    4s
H    1     1                    71844.205882 71662.9670  0.25%   0.0    4s
     3     5 71683.9363    2    1 71844.2059 71683.9363  0.22%  91.3    5s
H    4     4                    71764.949045 71683.9363  0.11%  68.5    5s
H    5     1                    71723.500000 71704.2500  0.03%  62.2    5s
*    6     0               5    71705.000000 71705.0000   0.0%  53.2    5s

Cutting planes:
  Gomory: 1
  Flow cover: 6

Explored 7 nodes (9594 simplex iterations) in 5.13 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.170500000000e+04, best bound 7.170500000000e+04, gap 0.0%