foo.cc: In function 'int main()':
foo.cc:21:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for(int i=0;i<s.size();i++){
      |                 ~^~~~~~~~~
foo.cc:29:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for(int i=0;i<paired.size();i++){
      |                 ~^~~~~~~~~~~~~~

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