Compilare: user.cpp: In function ‘void has(std::string, int)’: user.cpp:34:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = n; i < p.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:48:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++) ^ user.cpp:54:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < x[val].size(); i++) ^