I'd recommend Text::CSV_XS for reading the CSV file, though the structure seems reliable enough to simply use split if you wish.

I'd start by storing the data in a hash of hashes, but perhaps hash of arrays will be needed if multiple children nodes are possible.

There might be some useful tools in List::Utils, but if not, I'd probably store a sister element with depth as I walked through the tree (more efficient to build that whilst assembling the master tree, I should think).

From there it is likely to be straight subtraction of the depth values and select the smallest one(s). Would likely expect a tree walk for that part.

Probably build a reverse path hash on the way in, report on it on the way out.

For more details, post some code and show what isn't working as expected.

In reply to Re: find shortest path for each query from a CSV file by marinersk
in thread find shortest path for each query from a CSV file by zing

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