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

Optimize a model with 41664 rows, 41024 columns and 163904 nonzeros
Presolve removed 1340 rows and 0 columns
Presolve time: 0.25s
Presolved: 40324 rows, 41024 columns, 161224 nonzeros
Variable types: 40960 continuous, 64 integer (64 binary)

Root relaxation: objective 6.763764e+04, 8744 iterations, 1.57 seconds

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

     0     0 67637.6446    0    2          - 67637.6446     -      -    1s
H    0     0                    69280.000000 67637.6446  2.37%     -    2s
H    0     0                    68043.000000 67637.6446  0.60%     -    2s
     0     0 67641.9061    0    3 68043.0000 67641.9061  0.59%     -    2s
     0     0 67641.9061    0    3 68043.0000 67641.9061  0.59%     -    2s
     0     0 67641.9061    0    3 68043.0000 67641.9061  0.59%     -    3s
     0     0 67641.9061    0    2 68043.0000 67641.9061  0.59%     -    5s
     0     0 67642.1827    0    4 68043.0000 67642.1827  0.59%     -    5s
     0     2 67643.6416    0    4 68043.0000 67643.6416  0.59%     -    7s
H   10     7                    68041.000000 67774.8918  0.39%   106    8s
H   12     8                    68024.411765 67774.8918  0.37%  93.7    8s
*   41     9               5    67992.000000 67799.5063  0.28%  78.3    9s
*   67     6              11    67954.000000 67913.1886  0.06%  60.7    9s

Cutting planes:
  Gomory: 3
  Flow cover: 1

Explored 74 nodes (17599 simplex iterations) in 9.72 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.795400000000e+04, best bound 6.794946560319e+04, gap 0.0067%