Compilare: user.cpp: In function ‘int main()’: user.cpp:17:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^ user.cpp:19:59: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&v[i].first,&v[i].second.first); ^ user.cpp:49:14: warning: ‘pmax’ may be used uninitialized in this function [-Wmaybe-uninitialized] sol(pmax); ^