Compilare: user.cpp: In function ‘int main()’: user.cpp:16:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < b.size() - a.size() + 1; i++) ^ user.cpp:19:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < a.size(); j++) ^ user.cpp:30:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < positions.size(); i++) ^