The Rabin-Karp algorithm
The Rabin-Karp pattern matching algorithm is an improved version of the brute force approach to find the location of the given pattern in the text string. The performance of the Rabin-Karp algorithm is improved by reducing the number of comparisons with the help of hashing. We discussed the concept of hashing in Chapter 8, Hash Tables. The hashing function returns a unique numeric value for a given string.
This algorithm is faster than the brute force approach as it avoids unnecessary comparisons. In this algorithm, we compare the hash value of the pattern with the hash value of the substring of the text string. If the hash values are not matched, the pattern is shifted forward one position. This is a better algorithm as compared to the brute-force algorithm since there is no need to compare all the characters of the pattern one by one.
This algorithm is based on the concept that if the hash values of the two strings are equal, then it is assumed...
