foo.cc: In function 'int main()':
foo.cc:19:9: warning: unused variable 'j' [-Wunused-variable]
   19 |   int i,j,k,x,y,z;
      |         ^
foo.cc:19:11: warning: unused variable 'k' [-Wunused-variable]
   19 |   int i,j,k,x,y,z;
      |           ^
foo.cc:20:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   20 |   scanf("%d",&n);
      |   ~~~~~^~~~~~~~~
foo.cc:23:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   23 |       scanf("%d%d%d",&x,&y,&z);
      |       ~~~~~^~~~~~~~~~~~~~~~~~~

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