Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:07:22 2013

Optimize a model with 23568 rows, 23088 columns and 92208 nonzeros
Presolve removed 1678 rows and 0 columns
Presolve time: 0.14s
Presolved: 21890 rows, 23088 columns, 88852 nonzeros
Variable types: 23040 continuous, 48 integer (48 binary)

Root relaxation: objective 4.192825e+04, 2963 iterations, 0.25 seconds

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

     0     0 41928.2500    0    2          - 41928.2500     -      -    0s
H    0     0                    42638.000000 41928.2500  1.66%     -    0s
     0     0 41928.2553    0    3 42638.0000 41928.2553  1.66%     -    0s
     0     0 41928.3667    0    3 42638.0000 41928.3667  1.66%     -    0s
     0     2 41937.3254    0    3 42638.0000 41937.3254  1.64%     -    1s
H    4     4                    42617.000000 42021.7798  1.40%  60.5    1s
H   10     5                    42587.000000 42021.7798  1.33%  72.2    1s
H   11     5                    42424.125000 42094.0000  0.78%  70.9    1s
H   12     4                    42245.250000 42094.2785  0.36%  68.0    1s
H   15     4                    42198.000000 42094.2785  0.25%  56.7    1s
*   17     5               9    42182.000000 42094.2785  0.21%  51.5    1s
*   21     1               5    42162.000000 42126.0000  0.09%  45.1    1s
*   22     0               6    42149.000000 42149.0000   0.0%  44.2    1s

Cutting planes:
  Gomory: 1
  Flow cover: 2

Explored 23 nodes (3946 simplex iterations) in 1.95 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.214900000000e+04, best bound 4.214900000000e+04, gap 0.0%