Compilare: main.cpp: In function 'void DFS(int)': main.cpp:24:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[Node].size(); ++i) ~^~~~~~~~~~~~~~~ main.cpp: In function 'bool Ok()': main.cpp:31:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<V.size(); ++i) ~^~~~~~~~~ main.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<V.size(); ++j) ~^~~~~~~~~ main.cpp:38:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t=0; t<G[V[j]].size(); ++t) ~^~~~~~~~~~~~~~~ main.cpp:42:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<V.size(); ++j) ~^~~~~~~~~