Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:19:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<gr[nod].size(); i++) ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:61:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<d.size(); i++) ~^~~~~~~~~