foo.cc: In function 'int main()':
foo.cc:22:6: error: 'Judfe' was not declared in this scope; did you mean 'Judge'?
   22 |   if(Judfe(i))
      |      ^~~~~
      |      Judge
foo.cc:24:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |  for(int i=0;i<a.size();i++)
      |              ~^~~~~~~~~

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