Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:16:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();++i) ^ user.cpp:25:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();++i) ^ user.cpp:33:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();++i) ^ user.cpp:35:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();++i) ^ user.cpp:46:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nod.size();++i) ^ user.cpp:53:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nod.size();++i) ^ user.cpp:62:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();++i) ^ user.cpp: In function ‘void dffs(int, int)’: user.cpp:75:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();++i) ^