Gurobi 5.0.1 (linux64) logging started Fri Jan 18 00:55:20 2013

Optimize a model with 340 rows, 1620 columns and 3610 nonzeros
Presolve removed 20 rows and 30 columns
Presolve time: 0.01s
Presolved: 320 rows, 1590 columns, 3180 nonzeros
Variable types: 1400 continuous, 190 integer (190 binary)

Root relaxation: objective 1.997658e+04, 111 iterations, 0.00 seconds

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

     0     0 19976.5790    0    2          - 19976.5790     -      -    0s
     0     0 19990.3762    0    4          - 19990.3762     -      -    0s
     0     0 19993.2155    0    4          - 19993.2155     -      -    0s
     0     0 19993.5630    0    4          - 19993.5630     -      -    0s
     0     0 19993.5630    0    4          - 19993.5630     -      -    0s
H    0     0                    21286.251005 19993.5630  6.07%     -    0s
     0     2 19995.4740    0    4 21286.2510 19995.4740  6.06%     -    0s
*   19    16              15    20282.148876 20094.0566  0.93%   3.0    0s
*   26    12               6    20261.467355 20100.7231  0.79%   3.0    0s
*   32    11               8    20230.950811 20104.6750  0.62%   2.8    0s
*   43     7              11    20166.351489 20136.7808  0.15%   3.0    0s
*   46     5               3    20158.174631 20143.9179  0.07%   3.0    0s

Cutting planes:
  Gomory: 2
  Flow cover: 4

Explored 51 nodes (317 simplex iterations) in 0.09 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.015817463139e+04, best bound 2.015796705401e+04, gap 0.0010%