Compilare: main.cpp: In function 'void dfs(int)': main.cpp:19:23: 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:63:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < Ord.size (); ++ i) { ~~^~~~~~~~~~~~~