foo.cc: In function 'int main()':
foo.cc:133:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  133 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
foo.cc:138:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  138 |             scanf("%d",&x);
      |             ~~~~~^~~~~~~~~

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