Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:47:00 2013

Optimize a model with 280 rows, 3650 columns and 22150 nonzeros
Presolve removed 10 rows and 570 columns
Presolve time: 0.03s
Presolved: 270 rows, 3080 columns, 20150 nonzeros
Variable types: 3010 continuous, 70 integer (70 binary)

Root relaxation: objective 2.162324e+04, 152 iterations, 0.00 seconds

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

     0     0 21623.2446    0    8          - 21623.2446     -      -    0s
     0     0 21624.3948    0    8          - 21624.3948     -      -    0s
     0     0 21624.4751    0    8          - 21624.4751     -      -    0s
     0     0 21624.4751    0    8          - 21624.4751     -      -    0s
     0     2 21629.1675    0    8          - 21629.1675     -      -    0s
*   30    23              26    21790.326456 21637.5899  0.70%   5.2    0s
*   42    22              12    21760.541490 21639.9316  0.55%   4.7    0s
*   56    27              12    21760.160606 21655.1036  0.48%   4.4    0s
*   82    33              12    21759.733871 21687.0343  0.33%   4.0    0s
*  192    29              13    21759.387167 21748.7007  0.05%   3.1    0s
*  249    20              13    21759.199381 21751.7175  0.03%   2.8    0s

Cutting planes:
  Flow cover: 2

Explored 277 nodes (1062 simplex iterations) in 0.43 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.175919938108e+04, best bound 2.175749784654e+04, gap 0.0078%