foo.cc: In function 'int main()':
foo.cc:31:24: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |         for (int i=0; i<list.size(); i++) {
      |                       ~^~~~~~~~~~~~
foo.cc:34:24: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |         for (int i=0; i<list.size(); i++) {
      |                       ~^~~~~~~~~~~~

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