foo.cc: In function 'int main()':
foo.cc:38:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~
foo.cc:40:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&x[i],&y[i]),f[i]=i;
   ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
foo.cc:43:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&t1,&t2);
   ~~~~~^~~~~~~~~~~~~~~~

自豪的采用 HydroJudge 进行评测(github.com/hydro-dev/HydroJudge)

{"receive":"2020-08-10T03:54:47.844Z","handle":"2020-08-10T03:54:47.844Z","cache_start":"2020-08-10T03:54:47.852Z","read_cases":"2020-08-10T03:54:47.960Z","judge":"2020-08-10T03:54:47.961Z","done":"2020-08-10T03:54:48.457Z"}