foo.cc: In function 'int main()':
foo.cc:63:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&Q);
  ~~~~~^~~~~~~~~~~~~~
foo.cc:108:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&qx,&qy);
   ~~~~~^~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务