foo.cc: In function 'int main()':
foo.cc:37:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   37 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
foo.cc:41:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   41 |         scanf("%d%d",&x,&y);
      |         ~~~~~^~~~~~~~~~~~~~
foo.cc:44:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   44 |     For(i,1,n)  scanf("%d",&v[i]);
      |                 ~~~~~^~~~~~~~~~~~

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