In file included from iostream:39:
In member function 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long int) [with _CharT = char; _Traits = std::char_traits<char>]',
    inlined from 'int main()' at foo.cc:111:9:
/nix/store/h5kvfrjmpw792v8jg7nrzfkffmn0iyy8-gcc-12.3.0/include/c++/12.3.0/ostream:167:25: warning: 'finalcolor' may be used uninitialized [-Wmaybe-uninitialized]
  167 |       { return _M_insert(__n); }
      |                ~~~~~~~~~^~~~~
foo.cc: In function 'int main()':
foo.cc:26:8: note: 'finalcolor' was declared here
   26 |   long finalcolor;//最终结果
      |        ^~~~~~~~~~

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