foo.cc: In function 'int main()':
foo.cc:30:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   30 |  scanf("%lld%lld%lld", &n, &m, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:33:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   33 |   scanf("%lld", &x);
      |   ~~~~~^~~~~~~~~~~~
foo.cc:38:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   38 |   scanf("%lld%lld%lld", &x,&y,&d);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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