Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:34:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ^ user.cpp: In function ‘void defeseu(int)’: user.cpp:60:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V[x].size();i++) ^ user.cpp:75:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V[x].size();i++) ^ user.cpp:94:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l[x-n].size();i++) ^