Elimination of left factoring in the given grammar For each nonterminal A find the longest prefix (alpha) common to two or more of its alternatives.If alpha is not equal epsilon,i.e..,there is a nontrivial common prefix,replace all the A productio

运用扩展KMP算法求出某一字符串与另一字符串的所有最长公共前缀-KMP algorithm the extended use of a string with another string of all longest common prefix