Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:47:32 2013

Optimize a model with 41664 rows, 41024 columns and 163904 nonzeros
Presolve removed 4926 rows and 0 columns
Presolve time: 0.25s
Presolved: 36738 rows, 41024 columns, 154052 nonzeros
Variable types: 40960 continuous, 64 integer (64 binary)

Root relaxation: objective 7.742796e+04, 9306 iterations, 1.35 seconds

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

     0     0 77427.9626    0    5          - 77427.9626     -      -    1s
H    0     0                    77984.000000 77427.9626  0.71%     -    1s
H    0     0                    77570.000000 77427.9626  0.18%     -    2s
     0     0 77430.7538    0    8 77570.0000 77430.7538  0.18%     -    2s
     0     0 77430.7755    0    8 77570.0000 77430.7755  0.18%     -    2s
     0     0 77475.7248    0    5 77570.0000 77475.7248  0.12%     -    2s
H    0     0                    77568.000000 77475.7248  0.12%     -    3s
     0     0 77475.7248    0    3 77568.0000 77475.7248  0.12%     -    4s
     0     0 77475.9348    0    5 77568.0000 77475.9348  0.12%     -    4s
     0     0 77475.9348    0    5 77568.0000 77475.9348  0.12%     -    4s
     0     0 77539.2487    0    3 77568.0000 77539.2487  0.04%     -    4s
     0     1 77542.3309    0    3 77568.0000 77542.3309  0.03%     -    5s

Cutting planes:
  Gomory: 1
  Flow cover: 1

Explored 4 nodes (12102 simplex iterations) in 5.22 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.756800000000e+04, best bound 7.756177777778e+04, gap 0.0080%