foo.cc: In function 'int main()':
foo.cc:29:25: warning: statement has no effect [-Wunused-value]
  if (ans>=0x3f3f3f3f)ans-1;
                      ~~~^~
foo.cc:15:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d%d%d",&n,&m,&s[0],&t[0],&f[0]);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:17:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d%d%d",&s[i],&t[i],&a[i],&b[i],&f[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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

{"receive":"2020-08-10T03:16:14.968Z","handle":"2020-08-10T03:16:14.968Z","cache_start":"2020-08-10T03:16:14.977Z","read_cases":"2020-08-10T03:16:15.084Z","judge":"2020-08-10T03:16:15.086Z","done":"2020-08-10T03:16:16.655Z"}