/in/foo.cc: In function 'int main()':
/in/foo.cc:19:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   19 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
/in/foo.cc:26:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   26 |         scanf("%d", &m);
      |         ~~~~~^~~~~~~~~~