What is the most efficient algorithm or approach for finding most frequent k-length sub-string from a given string?
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Hash all substrings of length K in O(N) and store this values in map O(NlogN)
It would be O(NKlogN)
If you implement rolling hashes it would be O(N*logN).
hash(s1..k) = (hash(s0..k - 1) - s0 * pk) * p + sk
by this relation hash values can calculate in O(1)