Gurobi 5.0.1 (linux64) logging started Fri Jan 18 06:08:19 2013

Optimize a model with 1600 rows, 50600 columns and 326550 nonzeros
Presolve removed 50 rows and 50 columns
Presolve time: 0.48s
Presolved: 1550 rows, 50550 columns, 301500 nonzeros
Variable types: 50100 continuous, 450 integer (450 binary)

Root relaxation: objective 2.198499e+05, 3001 iterations, 0.15 seconds

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

     0     0 219849.939    0    6          - 219849.939     -      -    0s
     0     0 219851.524    0    6          - 219851.524     -      -    1s
     0     0 219851.787    0    7          - 219851.787     -      -    1s
     0     0 219851.787    0    7          - 219851.787     -      -    1s
     0     0 219851.787    0    7          - 219851.787     -      -    1s
     0     2 219852.953    0    7          - 219852.953     -      -    5s
*   39    19              39    222622.35999 220306.336  1.04%  29.8    8s
    86    44 220925.975    3    6 222622.360 220580.132  0.92%  27.7   10s
*  199    35              17    221990.70522 221010.145  0.44%  44.4   13s
*  204    35              20    221990.67135 221010.145  0.44%  43.4   13s
   228    15     cutoff    4      221990.671 221761.588  0.10%  46.2   15s
*  251    12              22    221988.58808 221930.638  0.03%  43.5   15s

Cutting planes:
  Flow cover: 3

Explored 263 nodes (14512 simplex iterations) in 15.78 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.219885880773e+05, best bound 2.219776034404e+05, gap 0.0049%