Gurobi 5.0.1 (linux64) logging started Fri Jan 18 05:40:31 2013

Optimize a model with 320 rows, 6120 columns and 57310 nonzeros
Presolve removed 10 rows and 10 columns
Presolve time: 0.19s
Presolved: 310 rows, 6110 columns, 52300 nonzeros
Variable types: 6020 continuous, 90 integer (90 binary)

Root relaxation: objective 1.997658e+04, 141 iterations, 0.01 seconds

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

     0     0 19976.5790    0    6          - 19976.5790     -      -    0s
     0     0 19976.8125    0    6          - 19976.8125     -      -    0s
     0     0 20149.8316    0    6          - 20149.8316     -      -    0s
     0     0 20149.8316    0    6          - 20149.8316     -      -    0s
H    0     0                    20168.342324 20149.8316  0.09%     -    1s
     0     0 20154.7205    0    4 20168.3423 20154.7205  0.07%     -    1s
     0     0 20154.7396    0    4 20168.3423 20154.7396  0.07%     -    1s
     0     0 20154.8035    0    6 20168.3423 20154.8035  0.07%     -    1s
     0     0 20155.3680    0    6 20168.3423 20155.3680  0.06%     -    1s
     0     0 20155.3680    0    6 20168.3423 20155.3680  0.06%     -    1s
     0     2 20155.3680    0    6 20168.3423 20155.3680  0.06%     -    1s
*   11     6              10    20159.286618 20155.3680  0.02%   7.5    1s
*   22     6               8    20158.640457 20157.1529  0.01%   5.0    1s

Cutting planes:
  Flow cover: 1

Explored 23 nodes (741 simplex iterations) in 1.70 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.015864045700e+04, best bound 2.015715289726e+04, gap 0.0074%