Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:56:11 2013

Optimize a model with 44286 rows, 43626 columns and 174306 nonzeros
Presolve removed 3122 rows and 0 columns
Presolve time: 0.26s
Presolved: 41164 rows, 43626 columns, 168062 nonzeros
Variable types: 43560 continuous, 66 integer (66 binary)

Root relaxation: objective 7.272154e+04, 9196 iterations, 1.48 seconds

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

     0     0 72721.5394    0    3          - 72721.5394     -      -    1s
H    0     0                    74496.000000 72721.5394  2.38%     -    1s
H    0     0                    73712.000000 72721.5394  1.34%     -    2s
     0     0 72723.0771    0    5 73712.0000 72723.0771  1.34%     -    2s
H    0     0                    73700.000000 72723.0771  1.33%     -    2s
     0     0 72723.0771    0    5 73700.0000 72723.0771  1.33%     -    2s
H    0     0                    73569.000000 72723.0771  1.15%     -    3s
     0     2 72724.2866    0    5 73569.0000 72724.2866  1.15%     -    4s
     2     3 72810.5459    2    4 73569.0000 72810.5459  1.03%   133    5s
H    4     3                    73296.100000 72825.9830  0.64%  98.8    5s
*   18     9              16    73082.000000 72831.9872  0.34%  84.7    6s
H   27     6                    72995.000000 72918.8375  0.10%  73.6    6s

Cutting planes:
  Gomory: 2
  Flow cover: 5

Explored 42 nodes (12110 simplex iterations) in 6.90 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.299500000000e+04, best bound 7.299225763876e+04, gap 0.0038%