Compilare: main.cpp: In function 'void dfs(int)': main.cpp:21:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<L[nod].size(); i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:58:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<comp[i].size(); j++){ ~^~~~~~~~~~~~~~~