algorithm - For a given string which contains only digits , what's the optimal approach to return all valid ip address combinations? -

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example:

given “25525511135”

output : [“255.255.11.135”, “255.255.111.35”]. (sorted order)

kindly let me know if depth first search on here ?(that's thing striking me )

why important have 'optimal' approach answering this?

there not many permutations simple approach of checking every combination fits ip format , filtering out have out of range numbers work.

it's unlikely bottle neck whatever part of.


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