foo.cc: In function 'int main(int, char**)':
foo.cc:48:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   48 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
foo.cc:49:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   49 |  scanf("%d", &k);
      |  ~~~~~^~~~~~~~~~

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