Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:51:33 2013

Optimize a model with 42965 rows, 42315 columns and 169065 nonzeros
Presolve removed 2207 rows and 0 columns
Presolve time: 0.25s
Presolved: 40758 rows, 42315 columns, 164651 nonzeros
Variable types: 42250 continuous, 65 integer (65 binary)

Root relaxation: objective 7.558544e+04, 9094 iterations, 1.48 seconds

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

     0     0 75585.4422    0    5          - 75585.4422     -      -    1s
H    0     0                    77382.000000 75585.4422  2.32%     -    2s
     0     0 75598.5595    0    6 77382.0000 75598.5595  2.30%     -    2s
     0     0 75598.6137    0    6 77382.0000 75598.6137  2.30%     -    2s
H    0     0                    76048.000000 75598.6137  0.59%     -    3s
H    0     0                    75939.000000 75598.6137  0.45%     -    3s
     0     0 75598.6137    0    5 75939.0000 75598.6137  0.45%     -    5s
     0     0 75598.8027    0    6 75939.0000 75598.8027  0.45%     -    5s
     0     2 75634.1631    0    6 75939.0000 75634.1631  0.40%     -    6s
*    3     3               3    75754.000000 75700.1716  0.07%   101    6s

Cutting planes:
  Gomory: 2
  Flow cover: 4

Explored 11 nodes (13887 simplex iterations) in 6.88 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.575400000000e+04, best bound 7.575400000000e+04, gap 0.0%