Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:08:44 2013

Optimize a model with 68 rows, 2066 columns and 24148 nonzeros
Presolve removed 22 rows and 26 columns
Presolve time: 0.08s
Presolved: 46 rows, 2040 columns, 22098 nonzeros
Variable types: 2020 continuous, 20 integer (20 binary)

Root relaxation: objective 4.440467e+03, 13 iterations, 0.00 seconds

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

     0     0 4440.46714    0    3          - 4440.46714     -      -    0s
     0     0 4441.57853    0    3          - 4441.57853     -      -    0s
     0     0 4446.78799    0    3          - 4446.78799     -      -    0s
     0     0 4456.06252    0    3          - 4456.06252     -      -    0s
     0     0 4457.92833    0    3          - 4457.92833     -      -    0s
     0     0 4458.64632    0    3          - 4458.64632     -      -    0s
     0     0 4458.64632    0    3          - 4458.64632     -      -    0s
H    0     0                    4458.9449856 4458.64632  0.01%     -    0s

Cutting planes:
  Flow cover: 1

Explored 0 nodes (71 simplex iterations) in 0.42 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.458944985629e+03, best bound 4.458646318483e+03, gap 0.0067%