Compilare: user.cpp: In function ‘void printv(std::vector<int>)’: user.cpp:19:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();++i){ ^ user.cpp: In function ‘void df(int)’: user.cpp:32:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[x].size();++i){ ^ user.cpp: In function ‘int main()’: user.cpp:85:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<comp.size();++i){ ^