foo.cc: In function 'int main()':
foo.cc:18:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
foo.cc:21:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lf%d", &a[i], &b[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Found 7 testcases.
自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。