foo.cc: In function 'int main()':
foo.cc:77:11: warning: unused variable 'j' [-Wunused-variable]
     int i,j,k,p,q,x,y,z,ans=1;
           ^
foo.cc:77:13: warning: unused variable 'k' [-Wunused-variable]
     int i,j,k,p,q,x,y,z,ans=1;
             ^
foo.cc:77:15: warning: unused variable 'p' [-Wunused-variable]
     int i,j,k,p,q,x,y,z,ans=1;
               ^
foo.cc:77:17: warning: unused variable 'q' [-Wunused-variable]
     int i,j,k,p,q,x,y,z,ans=1;
                 ^
foo.cc:77:23: warning: unused variable 'z' [-Wunused-variable]
     int i,j,k,p,q,x,y,z,ans=1;
                       ^
foo.cc:78:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
foo.cc:81:14: 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 HydroJudger 进行评测(github.com/hydro-dev/HydroJudger)

{"receive":"2020-05-30T09:05:20.019Z","handle":"2020-05-30T09:05:20.019Z","cache_start":"2020-05-30T09:05:20.026Z","read_cases":"2020-05-30T09:05:20.145Z","judge":"2020-05-30T09:05:20.148Z","done":"2020-05-30T09:05:22.137Z"}