foo.cc: In function 'int main()':
foo.cc:17:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |             for(int i=0;i<index.size();i++)
      |                         ~^~~~~~~~~~~~~
foo.cc:55:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |     for(int i=0;i<index.size();i++)
      |                 ~^~~~~~~~~~~~~

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