[GRASS5] sth about shortest path searching part in GRASS57

[zeal zeal]

Dear Sir,
   i'm really sorry for troubling you again. but while i'm looking into the 
code of grass57, i'm trying to find out the part of shortest path searching. 
but there are too much things and i failed. could you please also tell me 
something about the arithmetic of shortest path searching in grass57?
  thank you thousand times for helping!

Best Regard

Zealven Xu

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