Compilare: user.cpp: In function ‘int dfs()’: user.cpp:29:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:67:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[D].size();++j) ^ user.cpp:89:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<edge.size();++i) ^