foo.cc: In function 'int main()':
foo.cc:53:6: warning: unused variable 'k' [-Wunused-variable]
  int k=0;
      ^
foo.cc:40:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~
foo.cc:42:28: 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:45:8: 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":"2020-08-10T03:54:48.481Z","handle":"2020-08-10T03:54:48.481Z","cache_start":"2020-08-10T03:54:48.488Z","read_cases":"2020-08-10T03:54:48.592Z","judge":"2020-08-10T03:54:48.593Z","done":"2020-08-10T03:54:49.407Z"}