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The Rabin–Karp algorithm is a string-searching algorithm used to find a pattern inside a larger text. It’s especially useful when you need to search for multiple patterns or do repeated searches efficiently.
It uses rolling hashing.
text: a b c d b a c d
Given two strings a and b, return the minimum number of times you should repeat string a so that string b is a substring of it. If it is impossible for b to be a substring of a after repeating it, return -1.
Notice: string "abc" repeated 0 times is "", repeated 1 time is "abc" and repeated 2 times...
Given two strings a and b, return the minimum number of times you should repeat string a so that string b is a substring of it. If it is impossible for b to be a substring of a after repeating it, return -1.
Notice: string "abc" repeated 0 times is "", repeated 1 time is "abc" and repeated 2 times...