Compilare: user.cpp: In function ‘void Add(int, std::string, int, int, int)’: user.cpp:24:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (from+pos == s.size() || pos == 60) ^ user.cpp: In function ‘int check(int, std::string, int, int, int)’: user.cpp:42:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (from+pos == s.size() || pos == 60) ^ user.cpp: In function ‘int main()’: user.cpp:69:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < S[0].size(); i++) ^ user.cpp:77:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < S[i].size(); j++) ^