Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:19:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();++i) { ^ user.cpp: In function ‘int main()’: user.cpp:55:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<c.size();++i) fout<<c[i]<<' '; ^ user.cpp:59:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<pa.size();++i) fout<<pa[i]<<' '; ^