foo.cc: In function 'int main()':
foo.cc:13:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
foo.cc:14:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &x);
                 ^
foo.cc:20:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &x);
                  ^

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

{"receive":"2020-03-28T08:40:18.200Z","handle":"2020-03-28T08:40:18.200Z","cache_start":"2020-03-28T08:40:18.207Z","read_cases":"2020-03-28T08:40:18.941Z","judge":"2020-03-28T08:40:18.942Z","done":"2020-03-28T08:40:19.773Z"}