foo.cc: In function 'int main()':
foo.cc:34:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   34 | scanf("%d",&n);
      | ~~~~~^~~~~~~~~
foo.cc:36:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   36 | scanf("%d",&k);
      | ~~~~~^~~~~~~~~

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