Eroare de compilare: user.cpp:15:1: error: ‘unordered_map’ does not name a type unordered_map <int, vector <string> > M; ^ user.cpp: In function ‘int main()’: user.cpp:28:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); i++) { ^ user.cpp:43:40: error: ‘M’ was not declared in this scope for(int i=0; i<int(v.size()); i++) M[v[i].first] = temp; ^ user.cpp:44:40: error: ‘M’ was not declared in this scope for(int i=0; i<int(v.size()); i++) M[v[i].first].push_back(v[i].second); ^ user.cpp:46:8: error: ‘M’ was not declared in this scope g<<M.size()<<"\n"; ^