Compilare: user.cpp: In function ‘std::pair<int, int> conversie(std::string)’: user.cpp:13:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++){ ^ user.cpp: In function ‘void splituire(std::string, std::vector<std::basic_string<char> >&)’: user.cpp:28:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++){ ^ user.cpp: In function ‘int calc_first(std::pair<int, int>)’: user.cpp:47:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i_st=0;i_st<x[i][j].size();++i_st){ ^ user.cpp: In function ‘int calc(std::pair<int, int>)’: user.cpp:66:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i_st=0;i_st<x[i][j].size();++i_st){ ^