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

Optimize a model with 45627 rows, 44957 columns and 179627 nonzeros
Presolve removed 1590 rows and 0 columns
Presolve time: 0.26s
Presolved: 44037 rows, 44957 columns, 176447 nonzeros
Variable types: 44890 continuous, 67 integer (67 binary)

Root relaxation: objective 7.692626e+04, 10446 iterations, 2.00 seconds

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

     0     0 76926.2631    0    6          - 76926.2631     -      -    2s
H    0     0                    78613.000000 76926.2631  2.15%     -    2s
H    0     0                    78306.000000 76926.2631  1.76%     -    2s
     0     0 76931.8893    0    8 78306.0000 76931.8893  1.75%     -    2s
H    0     0                    78300.000000 76931.8893  1.75%     -    2s
     0     0 76931.8893    0    8 78300.0000 76931.8893  1.75%     -    3s
H    0     0                    78127.183432 76931.8893  1.53%     -    4s
H    0     0                    77294.000000 76931.8893  0.47%     -    4s
     0     2 76937.8071    0    8 77294.0000 76937.8071  0.46%     -    5s
*    6     5               5    77192.000000 77121.8729  0.09%   166    5s

Cutting planes:
  Gomory: 2
  Flow cover: 3

Explored 12 nodes (11631 simplex iterations) in 5.62 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.719200000000e+04, best bound 7.719200000000e+04, gap 0.0%