Compilare: main.cpp: In function 'int dfs(int)': main.cpp:20:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:44:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:59:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<a[i].size();j++) ~^~~~~~~~~~~~