foo.cc: In function ‘int main()’:
foo.cc:28:54: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   28 |                                         for(int f=0;f<num.size();f++)
      |                                                     ~^~~~~~~~~~~
foo.cc:49:21: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   49 |                 if(i!=ans.size()-1&&ans[i]<100000)
      |                    ~^~~~~~~~~~~~~~