Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:11:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<l[nod].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:27:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^ user.cpp:29:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&v[i]); ^