Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:18:27 2013

Optimize a model with 49770 rows, 49070 columns and 196070 nonzeros
Presolve removed 3181 rows and 0 columns
Presolve time: 0.30s
Presolved: 46589 rows, 49070 columns, 189708 nonzeros
Variable types: 49000 continuous, 70 integer (70 binary)

Root relaxation: objective 7.521663e+04, 8839 iterations, 1.40 seconds

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

     0     0 75216.6346    0    2          - 75216.6346     -      -    1s
H    0     0                    75306.000000 75216.6346  0.12%     -    1s
     0     0 75217.8528    0    2 75306.0000 75217.8528  0.12%     -    2s
     0     0 75218.2689    0    3 75306.0000 75218.2689  0.12%     -    2s
     0     0 75218.2689    0    3 75306.0000 75218.2689  0.12%     -    2s
     0     0 75219.7317    0    2 75306.0000 75219.7317  0.11%     -    3s
     0     0 75220.8942    0    1 75306.0000 75220.8942  0.11%     -    3s
     0     0 75220.8942    0    1 75306.0000 75220.8942  0.11%     -    4s
     0     0 75221.5640    0    2 75306.0000 75221.5640  0.11%     -    4s
     0     0 75221.5640    0    2 75306.0000 75221.5640  0.11%     -    4s
     0     0     cutoff    0      75306.0000 75306.0000   0.0%     -    4s

Cutting planes:
  Gomory: 1
  Flow cover: 2

Explored 0 nodes (10852 simplex iterations) in 4.95 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.530600000000e+04, best bound 7.530600000000e+04, gap 0.0%