Compilare: user.cpp: In function ‘int find(std::string)’: user.cpp:26:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<h[pos].size(); ++i) if (s==h[pos][i].first) return deal[h[pos][i].second]; ^ user.cpp: In function ‘int main()’: user.cpp:46:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<s.length(); ++i) if (s[i]!=' ') q+=s[i]; ^