Compilare: main.cpp: In function 'void dfs(int)': main.cpp:15:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:32:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<d[nod].size();i+=2){ ~^~~~~~~~~~~~~~ main.cpp:33:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i+1 < d[nod].size()) ~~~~^~~~~~~~~~~~~~~