Compilare: user.cpp: In function ‘int main()’: user.cpp:36:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j == P.size()) Apare.push_back(s), j = Prefix[j - 1]; ^ user.cpp:41:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < Apare.size(); i++) fout << Apare[i] + 1 - P.size() << ' '; ^