foo.cc: In function 'int main()':
foo.cc:19:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   19 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
foo.cc:24:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   24 |         scanf("%d",&d);
      |         ~~~~~^~~~~~~~~
foo.cc:27:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   27 |     for(int i=1;i<=n;i++) scanf("%d",&v[i]);
      |                           ~~~~~^~~~~~~~~~~~

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