question: public RabinKarp ( String pat ) { this . pat = pat ; R = 256 ; m = pat . length ( ) ; q = longRandomPrime ( ) ; RM = 1 ; for ( int i = 1 ; i <= m - 1 ; i ++ ) RM = ( R * RM ) % q ; patHash = hash ( pat , m ) ; }
target:  Preprocesses the pattern string.