/in/foo.cc: In function 'int main()':
/in/foo.cc:21:43: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |                 if(s[2]=='n')for(int i=4;i<s.size()-1;i++)fzd*=10,fzd+=s[i]-'0';
      |                                          ~^~~~~~~~~~~
/in/foo.cc:40:59: warning: comparison of integer expressions of different signedness: 'std::stack<char>::size_type' {aka 'long unsigned int'} and '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} [-Wsign-compare]
   40 |                                 if(!sze.empty()&&go.size()<sze.top())sze.pop();
      |                                                  ~~~~~~~~~^~~~~~~~~~
/in/foo.cc:41:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::stack<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |                                 if(dont>go.size())dont=-1;
      |                                    ~~~~^~~~~~~~~~
/in/foo.cc:66:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |                         for(int j=0;j<s.size();j++)l*=10,l+=s[j]-'0';
      |                                     ~^~~~~~~~~
/in/foo.cc:74:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |                         for(int j=0;j<s.size();j++)r*=10,r+=s[j]-'0';
      |                                     ~^~~~~~~~~