Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:56:20 2013

Optimize a model with 44286 rows, 43626 columns and 174306 nonzeros
Presolve removed 2109 rows and 0 columns
Presolve time: 0.26s
Presolved: 42177 rows, 43626 columns, 170088 nonzeros
Variable types: 43560 continuous, 66 integer (66 binary)

Root relaxation: objective 7.731884e+04, 9218 iterations, 1.58 seconds

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

     0     0 77318.8428    0    2          - 77318.8428     -      -    1s
H    0     0                    79134.000000 77318.8428  2.29%     -    2s
H    0     0                    77910.000000 77318.8428  0.76%     -    2s
     0     0 77322.7627    0    3 77910.0000 77322.7627  0.75%     -    2s
     0     0 77322.7627    0    3 77910.0000 77322.7627  0.75%     -    2s
     0     2 77374.5275    0    3 77910.0000 77374.5275  0.69%     -    4s
H    3     3                    77686.263736 77648.3516  0.05%   213    4s
*    6     2               5    77670.000000 77655.7442  0.02%   132    4s

Cutting planes:
  Gomory: 1
  Flow cover: 2

Explored 8 nodes (10110 simplex iterations) in 5.00 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.767000000000e+04, best bound 7.767000000000e+04, gap 0.0%