Compilare: user.cpp: In function ‘int main()’: user.cpp:37:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<edges.size();++i) ^ user.cpp:46:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<apm.size();i++)cout<<edges[i].second.second<<" "<<edges[i].second.first<<endl; ^