Compilare: main.cpp: In function 'void dfs(int)': main.cpp:16:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:27:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<G[nod].size();j++){ ~^~~~~~~~~~~~~~