foo.cc: In function 'void x(std::string, long long int)':
foo.cc:8:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |  for(i=0;i<s.size();i++)
      |          ~^~~~~~~~~
foo.cc:18:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 | for(i=1;i<s.size();i++)
      |         ~^~~~~~~~~
foo.cc:22:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |  for(i=0;i<s.size();i++)
      |          ~^~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:29:11: 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]
   29 |  for(i=0;i<s1.size();i++)
      |          ~^~~~~~~~~~

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