Compilare: user.cpp: In function ‘std::vector<std::basic_string<char> > get(std::vector<std::basic_string<char> >&, char, std::unordered_map<std::basic_string<char>, std::pair<int, int> >&)’: user.cpp:22:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(; start < s.size(); ++start) ^ user.cpp: In function ‘void set(char, std::unordered_map<std::basic_string<char>, std::pair<int, int> >&)’: user.cpp:48:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(; start < s.first.size(); ++start) ^ user.cpp: In function ‘std::vector<std::basic_string<char> > get(char, std::unordered_map<std::basic_string<char>, std::pair<int, int> >&)’: user.cpp:70:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(; start < s.first.size(); ++start) ^