foo.cc: In function 'int main()':
foo.cc:26:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   26 | scanf("%lld",&n);
      | ~~~~~^~~~~~~~~~~
foo.cc:27:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   27 | for (int i=1;i<=n;i++) scanf("%lld",&a[i]);
      |                        ~~~~~^~~~~~~~~~~~~~
foo.cc:28:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   28 | scanf("%lld",&m);
      | ~~~~~^~~~~~~~~~~
foo.cc:29:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   29 | for (int i=1;i<=m;i++) scanf("%lld",&b[i]);
      |                        ~~~~~^~~~~~~~~~~~~~

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