Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:52:03 2013

Optimize a model with 42965 rows, 42315 columns and 169065 nonzeros
Presolve removed 1426 rows and 0 columns
Presolve time: 0.25s
Presolved: 41539 rows, 42315 columns, 166213 nonzeros
Variable types: 42250 continuous, 65 integer (65 binary)

Root relaxation: objective 7.448773e+04, 8340 iterations, 1.26 seconds

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

     0     0 74487.7303    0    2          - 74487.7303     -      -    1s
H    0     0                    75364.000000 74487.7303  1.16%     -    1s
H    0     0                    74754.000000 74487.7303  0.36%     -    1s
     0     0 74488.8466    0    3 74754.0000 74488.8466  0.35%     -    2s
     0     0 74488.8466    0    3 74754.0000 74488.8466  0.35%     -    2s
     0     0 74488.8466    0    3 74754.0000 74488.8466  0.35%     -    2s
     0     0 74489.1991    0    3 74754.0000 74489.1991  0.35%     -    2s
     0     0 74489.1991    0    2 74754.0000 74489.1991  0.35%     -    4s
     0     0 74489.1991    0    3 74754.0000 74489.1991  0.35%     -    5s
     0     0 74489.3697    0    3 74754.0000 74489.3697  0.35%     -    5s
     0     2 74500.7305    0    3 74754.0000 74500.7305  0.34%     -    6s
*    7     3               5    74729.000000 74729.0000   0.0%  94.4    6s

Cutting planes:
  Gomory: 1
  Flow cover: 4

Explored 8 nodes (12899 simplex iterations) in 6.37 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.472900000000e+04, best bound 7.472900000000e+04, gap 0.0%