Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:20:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[x].size();i++) ^ user.cpp: In function ‘void DFS2(int, int)’: user.cpp:55:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:126:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<vmuchii.size();i++) ^