foo.cc: In function 'int zhi(int)':
foo.cc:4:6: warning: unused variable 'n' [-Wunused-variable]
  int n=0;
      ^
foo.cc: In function 'int main()':
foo.cc:18:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s",a);
  ~~~~~^~~~~~~~

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

{"receive":"2020-06-11T12:24:57.273Z","handle":"2020-06-11T12:24:57.273Z","cache_start":"2020-06-11T12:24:57.280Z","read_cases":"2020-06-11T12:24:57.407Z","judge":"2020-06-11T12:24:57.410Z","done":"2020-06-11T12:24:59.297Z"}