Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:52:17 2013

Optimize a model with 42965 rows, 42315 columns and 169065 nonzeros
Presolve removed 3280 rows and 0 columns
Presolve time: 0.25s
Presolved: 39685 rows, 42315 columns, 162505 nonzeros
Variable types: 42250 continuous, 65 integer (65 binary)

Root relaxation: objective 7.456690e+04, 7622 iterations, 1.11 seconds

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

     0     0 74566.9003    0    4          - 74566.9003     -      -    1s
H    0     0                    76082.000000 74566.9003  1.99%     -    1s
     0     0 74573.3214    0    6 76082.0000 74573.3214  1.98%     -    1s
H    0     0                    74701.000000 74573.3214  0.17%     -    2s
     0     0 74575.6598    0    6 74701.0000 74575.6598  0.17%     -    2s
     0     0 74575.6598    0    4 74701.0000 74575.6598  0.17%     -    3s
     0     0 74575.6598    0    6 74701.0000 74575.6598  0.17%     -    3s
     0     0 74575.6972    0    6 74701.0000 74575.6972  0.17%     -    3s
     0     0 74576.7059    0    6 74701.0000 74576.7059  0.17%     -    3s
     0     0 74576.7059    0    6 74701.0000 74576.7059  0.17%     -    3s
     0     0 74588.6815    0    3 74701.0000 74588.6815  0.15%     -    3s
     0     2 74594.2667    0    3 74701.0000 74594.2667  0.14%     -    4s
*    7     3               5    74673.000000 74648.8800  0.03%  58.9    4s

Cutting planes:
  Gomory: 3
  Flow cover: 4

Explored 10 nodes (10875 simplex iterations) in 4.14 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.467300000000e+04, best bound 7.467300000000e+04, gap 0.0%