foo.cc: In function 'int main()':
foo.cc:60:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |                                 if(idx==fz.size()-1){
      |                                    ~~~^~~~~~~~~~~~~
foo.cc:81:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   81 |                         for(i++;i < s.size();i++){
      |                                 ~~^~~~~~~~~~
foo.cc:98:45: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   98 |                         for(int idx = 0;idx < output.size();idx++){
      |                                         ~~~~^~~~~~~~~~~~~~~
foo.cc:100:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  100 |                                 if(idx==output.size()-1) cout << "]" << endl;
      |                                    ~~~^~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务