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

Optimize a model with 1600 rows, 50600 columns and 326550 nonzeros
Presolve removed 50 rows and 50 columns
Presolve time: 0.83s
Presolved: 1550 rows, 50550 columns, 301500 nonzeros
Variable types: 50100 continuous, 450 integer (450 binary)

Root relaxation: objective 2.252562e+05, 3164 iterations, 0.35 seconds

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

     0     0 225256.157    0    3          - 225256.157     -      -    1s
     0     0 225260.740    0    3          - 225260.740     -      -    2s
     0     0 225260.740    0    3          - 225260.740     -      -    2s
     0     2 225267.920    0    3          - 225267.920     -      -    7s
    23    25 225949.167   23    3          - 225515.043     -   39.8   10s
*   30     6              30    225949.35430 225515.043  0.19%  30.9   10s
*   42     3              10    225915.15199 225529.346  0.17%  40.1   10s

Cutting planes:
  Flow cover: 1

Explored 44 nodes (5243 simplex iterations) in 10.76 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.259151519913e+05, best bound 2.259110110937e+05, gap 0.0018%