foo.cc: In function 'int main()':
foo.cc:26:9: warning: unused variable 'k' [-Wunused-variable]
     int k,kk;
         ^
foo.cc:26:11: warning: unused variable 'kk' [-Wunused-variable]
     int k,kk;
           ^~
foo.cc:16:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d",&x,&y,&z);     
         ~~~~~^~~~~~~~~~~~~~~~~~~

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

{"receive":"2020-08-06T01:23:33.827Z","handle":"2020-08-06T01:23:33.827Z","cache_start":"2020-08-06T01:23:33.834Z","read_cases":"2020-08-06T01:23:33.954Z","judge":"2020-08-06T01:23:33.956Z","done":"2020-08-06T01:23:35.334Z"}