Compilare: main.cpp: In function 'void dfs(int)': main.cpp:15:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.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); ^ main.cpp:29:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&x); ^ main.cpp:35:13: warning: 'rad' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf (fout,"%d",sol[rad]); ~~~~~~~~^~~~~~~~~~~~~~~~~~~~