foo.cc: In function 'bool check(long long unsigned int)':
foo.cc:14:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=1;i<=n;i++)
              ~^~~
foo.cc: In function 'int main()':
foo.cc:32:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=1;i<=n;i++) cin>>a[i];
              ~^~~
foo.cc:33:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=1;i<=n;i++) cin>>b[i];
              ~^~~

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