Compilare: main.cpp: In function 'void dfs1(int)': main.cpp:19:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void dfsn(int)': main.cpp:31:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<R[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp:34:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<G[nod1].size(); j++) ~^~~~~~~~~~~~~~~