foo.cc: In function 'int main()':
foo.cc:37:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   37 | scanf("%d",&n);
      | ~~~~~^~~~~~~~~
foo.cc:39:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 | scanf("%d",&(b[i]));
      | ~~~~~^~~~~~~~~~~~~~

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