## is there any paper or an explanation on how to implement a two dimensional KMP?

问题 I tried to solve the problem of two dimensional search using a combination of Aho-Corasick and a single dimensional KMP, however, I still need something faster. To elaborate, I have a matrix A of characters of size n1*n2 and I wish to find all occurrences of a smaller matrix B of size m1*m2 and I want that to be in O(n1*n2+m1*m2) if possible. For example: A = a b c b c b b c a c a c d a b a b a q a s d q a and B = b c b c a c a b a the algorithm should return the indexes of say, the upper