Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:16:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<gr[node].size(); i++) ~^~~~~~~~~~~~~~~~ main.cpp:26:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<gr[node].size(); i++) ~^~~~~~~~~~~~~~~~ main.cpp:38:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<gr[node].size(); i++) ~^~~~~~~~~~~~~~~~ main.cpp:67:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<gr[node].size(); i++) ~^~~~~~~~~~~~~~~~ main.cpp:85:34: warning: 'nod1' may be used uninitialized in this function [-Wmaybe-uninitialized] g<<nod1<<" "<<node<<" "<<nod2<<'\n'; ^~~ main.cpp:58:30: warning: 'nod1' may be used uninitialized in this function [-Wmaybe-uninitialized] g<<nod1<<" "<<node<<" "<<nod2<<'\n'; ^~~