foo.cc: In function 'int main()':
foo.cc:26:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &n, &k);
   ~~~~~^~~~~~~~~~~~~~~~
foo.cc:33:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d", &x);
       ~~~~~^~~~~~~~~~
foo.cc:37:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d%d", &x, &y);
       ~~~~~^~~~~~~~~~~~~~~~

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