Compilare: user.cpp: In function ‘void make_kmp_prefix()’: user.cpp:14:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i < A.length(); ++i){ ^ user.cpp: In function ‘void make_kmp_match()’: user.cpp:24:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= B.length(); ++i){ ^ user.cpp:28:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(q + 1== A.length()){ ^ user.cpp: In function ‘int main()’: user.cpp:50:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sol.size(); ++i) ^