foo.cc: In function 'int main()':
foo.cc:101:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~
foo.cc:104:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&coordin[i][1], &coordin[i][2]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:108:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &x, &y);
   ~~~~~^~~~~~~~~~~~~~~~

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

{"receive":"2020-07-29T12:25:58.542Z","handle":"2020-07-29T12:25:58.542Z","cache_start":"2020-07-29T12:25:58.570Z","read_cases":"2020-07-29T12:25:58.704Z","judge":"2020-07-29T12:25:58.710Z","done":"2020-07-29T12:25:59.631Z"}