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Leetcode has a very nice problem called Restore IP Addresses. The task is that for given string s containing only digits, we find all possible valid IPv4 addresses that can be formed by inserting dots into s. For example, from "25525511135" we can form only addresses 255.255.11.135 and 255.255.111.35. Solution in 16 lines First, we will construct three functions of type String -> [(Int, String)].…
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