foo.cc: In function 'int Diff(std::__cxx11::string)':
foo.cc:6:18: error: 'std::__cxx11::string {aka class std::__cxx11::basic_string<char>}' has no member named 'lengh'; did you mean 'length'?
  for(int i=0;i<s.lengh();i++)
                  ^~~~~
                  length

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