Rezumat problemă

b16

#1270

Se dă un număr natural în baza 16. Să se transforme acest număr în baza 10.

Consola Vilău Marian (marianvilau) Marian Vilau ușoară

Clasa 10 Şiruri de caractere Prelucrări elementare pe șiruri de caractere

Rezolvă

Detalii

Problema	b16	Operații I/O	tastatură/ecran
Limita timp	0.1 secunde	Limita memorie	Total: 64 MB / Stivă 8 MB
Id soluție	#64052412	Utilizator	Merticariu Alexia (alexiiaaa_27)
Fișier	b16.cpp	Dimensiune	381 B
Data încărcării	14 Aprilie 2026, 11:45	Scor/rezultat	Eroare de compilare

Evaluare

Mesaj compilare

b16.cpp: In function 'int main()':
b16.cpp:6:12: error: cannot bind 'std::istream {aka std::basic_istream<char>}' lvalue to 'std::basic_istream<char>&&'
     cin >> s;

            ^
In file included from /usr/include/c++/4.8/sstream:38:0,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/istream:872:5: error:   initializing argument 1 of 'std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&&, _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Tp = std::basic_string<char> [100]]'
     operator>>(basic_istream<_CharT, _Traits>&& __is, _Tp& __x)
     ^
b16.cpp:7:34: error: cannot convert 'std::string* {aka std::basic_string<char>*}' to 'const char*' for argument '1' to 'size_t strlen(const char*)'
     for (char i = 0; i < strlen(s); i++) {

                                  ^
b16.cpp:8:17: warning: array subscript has type 'char' [-Wchar-subscripts]
         if ((s[i] >= '0') && (s[i] <= '9')) 

                 ^
b16.cpp:8:19: error: no match for 'operator>=' (operand types are 'std::string {aka std::basic_string<char>}' and 'char')
         if ((s[i] >= '0') && (s[i] <= '9')) 

                   ^
b16.cpp:8:19: note: candidates are:
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_pair.h:245:5: note: template<class _T1, class _T2> constexpr bool std::operator>=(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
     operator>=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
     ^
/usr/include/c++/4.8/bits/stl_pair.h:245:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::pair<_T1, _T2>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:321:5: note: template<class _Iterator> bool std::operator>=(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator>=(const reverse_iterator<_Iterator>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:321:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::reverse_iterator<_Iterator>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:371:5: note: template<class _IteratorL, class _IteratorR> bool std::operator>=(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator>=(const reverse_iterator<_IteratorL>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:371:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::reverse_iterator<_Iterator>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:1091:5: note: template<class _IteratorL, class _IteratorR> bool std::operator>=(const std::move_iterator<_Iterator>&, const std::move_iterator<_IteratorR>&)
     operator>=(const move_iterator<_IteratorL>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:1091:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::move_iterator<_Iterator>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:1097:5: note: template<class _Iterator> bool std::operator>=(const std::move_iterator<_Iterator>&, const std::move_iterator<_Iterator>&)
     operator>=(const move_iterator<_Iterator>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:1097:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::move_iterator<_Iterator>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/string:52:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2680:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator>=(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator>=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
/usr/include/c++/4.8/bits/basic_string.h:2680:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   mismatched types 'const std::basic_string<_CharT, _Traits, _Alloc>' and 'char'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/string:52:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2692:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator>=(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
     operator>=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
/usr/include/c++/4.8/bits/basic_string.h:2692:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   mismatched types 'const _CharT*' and 'char'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/string:52:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2704:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator>=(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator>=(const _CharT* __lhs,
     ^
/usr/include/c++/4.8/bits/basic_string.h:2704:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   mismatched types 'const _CharT*' and 'std::basic_string<char>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/vector:64:0,
                 from /usr/include/c++/4.8/bits/random.h:34,
                 from /usr/include/c++/4.8/random:50,
                 from /usr/include/c++/4.8/bits/stl_algo.h:65,
                 from /usr/include/c++/4.8/algorithm:62,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_vector.h:1446:5: note: template<class _Tp, class _Alloc> bool std::operator>=(const std::vector<_Tp, _Alloc>&, const std::vector<_Tp, _Alloc>&)
     operator>=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
     ^
/usr/include/c++/4.8/bits/stl_vector.h:1446:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::vector<_Tp, _Alloc>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/tuple:39:0,
                 from /usr/include/c++/4.8/functional:55,
                 from /usr/include/c++/4.8/bits/stl_algo.h:66,
                 from /usr/include/c++/4.8/algorithm:62,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from b16.cpp:1:
/usr/include/c++/4.8/array:256:5: note: template<class _Tp, unsigned int _Nm> bool std::operator>=(const std::array<_Tp, _Nm>&, const std::array<_Tp, _Nm>&)
     operator>=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
     ^
/usr/include/c++/4.8/array:256:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::array<_Tp, _Nm>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/functional:55:0,
                 from /usr/include/c++/4.8/bits/stl_algo.h:66,
                 from /usr/include/c++/4.8/algorithm:62,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from b16.cpp:1:
/usr/include/c++/4.8/tuple:853:5: note: template<class ... _TElements, class ... _UElements> constexpr bool std::operator>=(const std::tuple<_Elements ...>&, const std::tuple<_Elements ...>&)
     operator>=(const tuple<_TElements...>& __t,
     ^
/usr/include/c++/4.8/tuple:853:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::tuple<_Elements ...>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/deque:64:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:67,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_deque.h:314:5: note: template<class _Tp, class _Ref, class _Ptr> bool std::operator>=(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _Ref, _Ptr>&)
     operator>=(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
     ^
/usr/include/c++/4.8/bits/stl_deque.h:314:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/deque:64:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:67,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_deque.h:321:5: note: template<class _Tp, class _RefL, class _PtrL, class _RefR, class _PtrR> bool std::operator>=(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _RefR, _PtrR>&)
     operator>=(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
     ^
/usr/include/c++/4.8/bits/stl_deque.h:321:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/deque:64:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:67,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_deque.h:2004:5: note: template<class _Tp, class _Alloc> bool std::operator>=(const std::deque<_Tp, _Alloc>&, const std::deque<_Tp, _Alloc>&)
     operator>=(const deque<_Tp, _Alloc>& __x,
     ^
/usr/include/c++/4.8/bits/stl_deque.h:2004:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::deque<_Tp, _Alloc>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/list:63:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:78,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_list.h:1656:5: note: template<class _Tp, class _Alloc> bool std::operator>=(const std::list<_Tp, _Alloc>&, const std::list<_Tp, _Alloc>&)
     operator>=(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
     ^
/usr/include/c++/4.8/bits/stl_list.h:1656:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::list<_Tp, _Alloc>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/map:60:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:80,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_tree.h:948:5: note: template<class _Key, class _Val, class _KeyOfValue, class _Compare, class _Alloc> bool std::operator>=(const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&, const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&)
     operator>=(const _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/4.8/bits/stl_tree.h:948:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/map:61:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:80,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_map.h:1007:5: note: template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator>=(const std::map<_Key, _Tp, _Compare, _Alloc>&, const std::map<_Key, _Tp, _Compare, _Alloc>&)
     operator>=(const map<_Key, _Tp, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/4.8/bits/stl_map.h:1007:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::map<_Key, _Tp, _Compare, _Alloc>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/map:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:80,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_multimap.h:909:5: note: template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator>=(const std::multimap<_Key, _Tp, _Compare, _Alloc>&, const std::multimap<_Key, _Tp, _Compare, _Alloc>&)
     operator>=(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/4.8/bits/stl_multimap.h:909:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::multimap<_Key, _Tp, _Compare, _Alloc>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/memory:81:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/unique_ptr.h:583:5: note: template<class _Tp, class _Dp, class _Up, class _Ep> bool std::operator>=(const std::unique_ptr<_Tp, _Dp>&, const std::unique_ptr<_Up, _Ep>&)
     operator>=(const unique_ptr<_Tp, _Dp>& __x,
     ^
/usr/include/c++/4.8/bits/unique_ptr.h:583:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/memory:81:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/unique_ptr.h:589:5: note: template<class _Tp, class _Dp> bool std::operator>=(const std::unique_ptr<_Tp, _Dp>&, std::nullptr_t)
     operator>=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
     ^
/usr/include/c++/4.8/bits/unique_ptr.h:589:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/memory:81:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/unique_ptr.h:594:5: note: template<class _Tp, class _Dp> bool std::operator>=(std::nullptr_t, const std::unique_ptr<_Tp, _Dp>&)
     operator>=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
     ^
/usr/include/c++/4.8/bits/unique_ptr.h:594:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   cannot convert 's[((int)i)]' (type 'std::string {aka std::basic_string<char>}') to type 'std::nullptr_t'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/4.8/memory:82,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr_base.h:1112:5: note: template<class _Tp1, class _Tp2, __gnu_cxx::_Lock_policy _Lp> bool std::operator>=(const std::__shared_ptr<_Tp1, _Lp>&, const std::__shared_ptr<_Tp2, _Lp>&)
     operator>=(const __shared_ptr<_Tp1, _Lp>& __a,
     ^
/usr/include/c++/4.8/bits/shared_ptr_base.h:1112:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::__shared_ptr<_Tp1, _Lp>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/4.8/memory:82,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr_base.h:1118:5: note: template<class _Tp, __gnu_cxx::_Lock_policy _Lp> bool std::operator>=(const std::__shared_ptr<_Tp, _Lp>&, std::nullptr_t)
     operator>=(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
     ^
/usr/include/c++/4.8/bits/shared_ptr_base.h:1118:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::__shared_ptr<_Tp, _Lp>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/4.8/memory:82,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr_base.h:1123:5: note: template<class _Tp, __gnu_cxx::_Lock_policy _Lp> bool std::operator>=(std::nullptr_t, const std::__shared_ptr<_Tp, _Lp>&)
     operator>=(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept
     ^
/usr/include/c++/4.8/bits/shared_ptr_base.h:1123:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   cannot convert 's[((int)i)]' (type 'std::string {aka std::basic_string<char>}') to type 'std::nullptr_t'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/memory:82:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr.h:410:5: note: template<class _Tp1, class _Tp2> bool std::operator>=(const std::shared_ptr<_Tp1>&, const std::shared_ptr<_Tp2>&)
     operator>=(const shared_ptr<_Tp1>& __a,
     ^
/usr/include/c++/4.8/bits/shared_ptr.h:410:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::shared_ptr<_Tp1>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/memory:82:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr.h:416:5: note: template<class _Tp> bool std::operator>=(const std::shared_ptr<_Tp1>&, std::nullptr_t)
     operator>=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
     ^
/usr/include/c++/4.8/bits/shared_ptr.h:416:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::shared_ptr<_Tp1>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/memory:82:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr.h:421:5: note: template<class _Tp> bool std::operator>=(std::nullptr_t, const std::shared_ptr<_Tp1>&)
     operator>=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
     ^
/usr/include/c++/4.8/bits/shared_ptr.h:421:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   cannot convert 's[((int)i)]' (type 'std::string {aka std::basic_string<char>}') to type 'std::nullptr_t'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/queue:64:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:85,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_queue.h:310:5: note: template<class _Tp, class _Seq> bool std::operator>=(const std::queue<_Tp, _Seq>&, const std::queue<_Tp, _Seq>&)
     operator>=(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
     ^
/usr/include/c++/4.8/bits/stl_queue.h:310:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::queue<_Tp, _Seq>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/set:61:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:86,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_set.h:799:5: note: template<class _Key, class _Compare, class _Alloc> bool std::operator>=(const std::set<_Key, _Compare, _Alloc>&, const std::set<_Key, _Compare, _Alloc>&)
     operator>=(const set<_Key, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/4.8/bits/stl_set.h:799:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::set<_Key, _Compare, _Alloc>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/set:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:86,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_multiset.h:784:5: note: template<class _Key, class _Compare, class _Alloc> bool std::operator>=(const std::multiset<_Key, _Compare, _Alloc>&, const std::multiset<_Key, _Compare, _Alloc>&)
     operator>=(const multiset<_Key, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/4.8/bits/stl_multiset.h:784:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::multiset<_Key, _Compare, _Alloc>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/stack:61:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:88,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_stack.h:285:5: note: template<class _Tp, class _Seq> bool std::operator>=(const std::stack<_Tp, _Seq>&, const std::stack<_Tp, _Seq>&)
     operator>=(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
     ^
/usr/include/c++/4.8/bits/stl_stack.h:285:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::stack<_Tp, _Seq>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/valarray:587:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:94,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/valarray_after.h:419:5: note: template<class _Dom1, class _Dom2> std::_Expr<std::_BinClos<std::__greater_equal, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__greater_equal, typename _Dom1::value_type>::result_type> std::operator>=(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::_Expr<_Dom2, typename _Dom2::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(>=, __greater_equal)
     ^
/usr/include/c++/4.8/bits/valarray_after.h:419:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/valarray:587:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:94,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/valarray_after.h:419:5: note: template<class _Dom> std::_Expr<std::_BinClos<std::__greater_equal, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__greater_equal, typename _Dom1::value_type>::result_type> std::operator>=(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)
     _DEFINE_EXPR_BINARY_OPERATOR(>=, __greater_equal)
     ^
/usr/include/c++/4.8/bits/valarray_after.h:419:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/valarray:587:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:94,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/valarray_after.h:419:5: note: template<class _Dom> std::_Expr<std::_BinClos<std::__greater_equal, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__greater_equal, typename _Dom1::value_type>::result_type> std::operator>=(const typename _Dom::value_type&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(>=, __greater_equal)
     ^
/usr/include/c++/4.8/bits/valarray_after.h:419:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'char'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/valarray:587:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:94,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/valarray_after.h:419:5: note: template<class _Dom> std::_Expr<std::_BinClos<std::__greater_equal, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__greater_equal, typename _Dom1::value_type>::result_type> std::operator>=(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::valarray<typename _Dom::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(>=, __greater_equal)
     ^
/usr/include/c++/4.8/bits/valarray_after.h:419:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/valarray:587:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:94,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/valarray_after.h:419:5: note: template<class _Dom> std::_Expr<std::_BinClos<std::__greater_equal, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__greater_equal, typename _Dom1::value_type>::result_type> std::operator>=(const std::valarray<typename _Dom::value_type>&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(>=, __greater_equal)
     ^
/usr/include/c++/4.8/bits/valarray_after.h:419:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::valarray<typename _Dom::value_type>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:94:0,
                 from b16.cpp:1:
/usr/include/c++/4.8/valarray:1184:1: note: template<class _Tp> std::_Expr<std::_BinClos<std::__greater_equal, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__greater_equal, _Tp>::result_type> std::operator>=(const std::valarray<_Tp>&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(>=, __greater_equal)
 ^
/usr/include/c++/4.8/valarray:1184:1: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::valarray<_Tp>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:94:0,
                 from b16.cpp:1:
/usr/include/c++/4.8/valarray:1184:1: note: template<class _Tp> std::_Expr<std::_BinClos<std::__greater_equal, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__greater_equal, _Tp>::result_type> std::operator>=(const std::valarray<_Tp>&, const _Tp&)
 _DEFINE_BINARY_OPERATOR(>=, __greater_equal)
 ^
/usr/include/c++/4.8/valarray:1184:1: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::valarray<_Tp>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:94:0,
                 from b16.cpp:1:
/usr/include/c++/4.8/valarray:1184:1: note: template<class _Tp> std::_Expr<std::_BinClos<std::__greater_equal, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__greater_equal, _Tp>::result_type> std::operator>=(const _Tp&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(>=, __greater_equal)
 ^
/usr/include/c++/4.8/valarray:1184:1: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   mismatched types 'const std::valarray<_Tp>' and 'char'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/forward_list:38:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:102,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/forward_list.h:1381:5: note: template<class _Tp, class _Alloc> bool std::operator>=(const std::forward_list<_Tp, _Alloc>&, const std::forward_list<_Tp, _Alloc>&)
     operator>=(const forward_list<_Tp, _Alloc>& __lx,
     ^
/usr/include/c++/4.8/bits/forward_list.h:1381:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::forward_list<_Tp, _Alloc>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/future:40:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:103,
                 from b16.cpp:1:
/usr/include/c++/4.8/thread:216:3: note: bool std::operator>=(std::thread::id, std::thread::id)
   operator>=(thread::id __x, thread::id __y) noexcept
   ^
/usr/include/c++/4.8/thread:216:3: note:   no known conversion for argument 1 from 'std::string {aka std::basic_string<char>}' to 'std::thread::id'
In file included from /usr/include/c++/4.8/regex:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:108,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/regex.h:901:5: note: template<class _BiIter> bool std::operator>=(const std::sub_match<_BiIter>&, const std::sub_match<_BiIter>&)
     operator>=(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
     ^
/usr/include/c++/4.8/bits/regex.h:901:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::sub_match<_BiIter>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/regex:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:108,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/regex.h:979:5: note: template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::operator>=(std::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const std::sub_match<_BiIter>&)
     operator>=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
     ^
/usr/include/c++/4.8/bits/regex.h:979:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   mismatched types 'const std::sub_match<_BiIter>' and 'char'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/regex:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:108,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/regex.h:1053:5: note: template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::operator>=(const std::sub_match<_BiIter>&, std::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&)
     operator>=(const sub_match<_Bi_iter>& __lhs,
     ^
/usr/include/c++/4.8/bits/regex.h:1053:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::sub_match<_BiIter>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/regex:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:108,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/regex.h:1127:5: note: template<class _Bi_iter> bool std::operator>=(const typename std::iterator_traits<_Iter>::value_type*, const std::sub_match<_BiIter>&)
     operator>=(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
     ^
/usr/include/c++/4.8/bits/regex.h:1127:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   mismatched types 'const typename std::iterator_traits<_Iter>::value_type*' and 'std::basic_string<char>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/regex:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:108,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/regex.h:1201:5: note: template<class _Bi_iter> bool std::operator>=(const std::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)
     operator>=(const sub_match<_Bi_iter>& __lhs,
     ^
/usr/include/c++/4.8/bits/regex.h:1201:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::sub_match<_BiIter>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/regex:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:108,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/regex.h:1281:5: note: template<class _Bi_iter> bool std::operator>=(const typename std::iterator_traits<_Iter>::value_type&, const std::sub_match<_BiIter>&)
     operator>=(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
     ^
/usr/include/c++/4.8/bits/regex.h:1281:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   mismatched types 'const std::sub_match<_BiIter>' and 'char'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/regex:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:108,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/regex.h:1361:5: note: template<class _Bi_iter> bool std::operator>=(const std::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)
     operator>=(const sub_match<_Bi_iter>& __lhs,
     ^
/usr/include/c++/4.8/bits/regex.h:1361:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::sub_match<_BiIter>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:872:5: note: template<class _Iterator, class _Container> bool __gnu_cxx::operator>=(const __gnu_cxx::__normal_iterator<_Iterator, _Container>&, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&)
     operator>=(const __normal_iterator<_Iterator, _Container>& __lhs,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:872:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const __gnu_cxx::__normal_iterator<_Iterator, _Container>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:866:5: note: template<class _IteratorL, class _IteratorR, class _Container> bool __gnu_cxx::operator>=(const __gnu_cxx::__normal_iterator<_IteratorL, _Container>&, const __gnu_cxx::__normal_iterator<_IteratorR, _Container>&)
     operator>=(const __normal_iterator<_IteratorL, _Container>& __lhs,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:866:5: note:   template argument deduction/substitution failed:
b16.cpp:8:22: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const __gnu_cxx::__normal_iterator<_IteratorL, _Container>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                      ^
b16.cpp:8:34: warning: array subscript has type 'char' [-Wchar-subscripts]
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                  ^
b16.cpp:8:36: error: no match for 'operator<=' (operand types are 'std::string {aka std::basic_string<char>}' and 'char')
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                    ^
b16.cpp:8:36: note: candidates are:
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_pair.h:239:5: note: template<class _T1, class _T2> constexpr bool std::operator<=(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
     operator<=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
     ^
/usr/include/c++/4.8/bits/stl_pair.h:239:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::pair<_T1, _T2>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:315:5: note: template<class _Iterator> bool std::operator<=(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator<=(const reverse_iterator<_Iterator>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:315:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::reverse_iterator<_Iterator>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:365:5: note: template<class _IteratorL, class _IteratorR> bool std::operator<=(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator<=(const reverse_iterator<_IteratorL>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:365:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::reverse_iterator<_Iterator>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:1067:5: note: template<class _IteratorL, class _IteratorR> bool std::operator<=(const std::move_iterator<_Iterator>&, const std::move_iterator<_IteratorR>&)
     operator<=(const move_iterator<_IteratorL>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:1067:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::move_iterator<_Iterator>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/4.8/bits/char_traits.h:39,
                 from /usr/include/c++/4.8/ios:40,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:1073:5: note: template<class _Iterator> bool std::operator<=(const std::move_iterator<_Iterator>&, const std::move_iterator<_Iterator>&)
     operator<=(const move_iterator<_Iterator>& __x,
     ^
/usr/include/c++/4.8/bits/stl_iterator.h:1073:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::move_iterator<_Iterator>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/string:52:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2643:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator<=(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator<=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
/usr/include/c++/4.8/bits/basic_string.h:2643:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   mismatched types 'const std::basic_string<_CharT, _Traits, _Alloc>' and 'char'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/string:52:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2655:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator<=(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
     operator<=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
/usr/include/c++/4.8/bits/basic_string.h:2655:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   mismatched types 'const _CharT*' and 'char'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/string:52:0,
                 from /usr/include/c++/4.8/bits/locale_classes.h:40,
                 from /usr/include/c++/4.8/bits/ios_base.h:41,
                 from /usr/include/c++/4.8/ios:42,
                 from /usr/include/c++/4.8/istream:38,
                 from /usr/include/c++/4.8/sstream:38,
                 from /usr/include/c++/4.8/complex:45,
                 from /usr/include/c++/4.8/ccomplex:38,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2667:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator<=(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator<=(const _CharT* __lhs,
     ^
/usr/include/c++/4.8/bits/basic_string.h:2667:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   mismatched types 'const _CharT*' and 'std::basic_string<char>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/vector:64:0,
                 from /usr/include/c++/4.8/bits/random.h:34,
                 from /usr/include/c++/4.8/random:50,
                 from /usr/include/c++/4.8/bits/stl_algo.h:65,
                 from /usr/include/c++/4.8/algorithm:62,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_vector.h:1440:5: note: template<class _Tp, class _Alloc> bool std::operator<=(const std::vector<_Tp, _Alloc>&, const std::vector<_Tp, _Alloc>&)
     operator<=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
     ^
/usr/include/c++/4.8/bits/stl_vector.h:1440:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::vector<_Tp, _Alloc>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/tuple:39:0,
                 from /usr/include/c++/4.8/functional:55,
                 from /usr/include/c++/4.8/bits/stl_algo.h:66,
                 from /usr/include/c++/4.8/algorithm:62,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from b16.cpp:1:
/usr/include/c++/4.8/array:251:5: note: template<class _Tp, unsigned int _Nm> bool std::operator<=(const std::array<_Tp, _Nm>&, const std::array<_Tp, _Nm>&)
     operator<=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
     ^
/usr/include/c++/4.8/array:251:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::array<_Tp, _Nm>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/functional:55:0,
                 from /usr/include/c++/4.8/bits/stl_algo.h:66,
                 from /usr/include/c++/4.8/algorithm:62,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from b16.cpp:1:
/usr/include/c++/4.8/tuple:847:5: note: template<class ... _TElements, class ... _UElements> constexpr bool std::operator<=(const std::tuple<_Elements ...>&, const std::tuple<_Elements ...>&)
     operator<=(const tuple<_TElements...>& __t,
     ^
/usr/include/c++/4.8/tuple:847:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::tuple<_Elements ...>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/deque:64:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:67,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_deque.h:301:5: note: template<class _Tp, class _Ref, class _Ptr> bool std::operator<=(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _Ref, _Ptr>&)
     operator<=(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
     ^
/usr/include/c++/4.8/bits/stl_deque.h:301:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/deque:64:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:67,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_deque.h:308:5: note: template<class _Tp, class _RefL, class _PtrL, class _RefR, class _PtrR> bool std::operator<=(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _RefR, _PtrR>&)
     operator<=(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
     ^
/usr/include/c++/4.8/bits/stl_deque.h:308:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/deque:64:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:67,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_deque.h:1997:5: note: template<class _Tp, class _Alloc> bool std::operator<=(const std::deque<_Tp, _Alloc>&, const std::deque<_Tp, _Alloc>&)
     operator<=(const deque<_Tp, _Alloc>& __x,
     ^
/usr/include/c++/4.8/bits/stl_deque.h:1997:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::deque<_Tp, _Alloc>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/list:63:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:78,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_list.h:1650:5: note: template<class _Tp, class _Alloc> bool std::operator<=(const std::list<_Tp, _Alloc>&, const std::list<_Tp, _Alloc>&)
     operator<=(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
     ^
/usr/include/c++/4.8/bits/stl_list.h:1650:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::list<_Tp, _Alloc>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/map:60:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:80,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_tree.h:941:5: note: template<class _Key, class _Val, class _KeyOfValue, class _Compare, class _Alloc> bool std::operator<=(const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&, const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&)
     operator<=(const _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/4.8/bits/stl_tree.h:941:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/map:61:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:80,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_map.h:1000:5: note: template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator<=(const std::map<_Key, _Tp, _Compare, _Alloc>&, const std::map<_Key, _Tp, _Compare, _Alloc>&)
     operator<=(const map<_Key, _Tp, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/4.8/bits/stl_map.h:1000:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::map<_Key, _Tp, _Compare, _Alloc>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/map:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:80,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/stl_multimap.h:902:5: note: template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator<=(const std::multimap<_Key, _Tp, _Compare, _Alloc>&, const std::multimap<_Key, _Tp, _Compare, _Alloc>&)
     operator<=(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/4.8/bits/stl_multimap.h:902:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::multimap<_Key, _Tp, _Compare, _Alloc>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/memory:81:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/unique_ptr.h:547:5: note: template<class _Tp, class _Dp, class _Up, class _Ep> bool std::operator<=(const std::unique_ptr<_Tp, _Dp>&, const std::unique_ptr<_Up, _Ep>&)
     operator<=(const unique_ptr<_Tp, _Dp>& __x,
     ^
/usr/include/c++/4.8/bits/unique_ptr.h:547:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/memory:81:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/unique_ptr.h:553:5: note: template<class _Tp, class _Dp> bool std::operator<=(const std::unique_ptr<_Tp, _Dp>&, std::nullptr_t)
     operator<=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
     ^
/usr/include/c++/4.8/bits/unique_ptr.h:553:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/memory:81:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/unique_ptr.h:558:5: note: template<class _Tp, class _Dp> bool std::operator<=(std::nullptr_t, const std::unique_ptr<_Tp, _Dp>&)
     operator<=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
     ^
/usr/include/c++/4.8/bits/unique_ptr.h:558:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   cannot convert 's[((int)i)]' (type 'std::string {aka std::basic_string<char>}') to type 'std::nullptr_t'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/4.8/memory:82,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr_base.h:1080:5: note: template<class _Tp1, class _Tp2, __gnu_cxx::_Lock_policy _Lp> bool std::operator<=(const std::__shared_ptr<_Tp1, _Lp>&, const std::__shared_ptr<_Tp2, _Lp>&)
     operator<=(const __shared_ptr<_Tp1, _Lp>& __a,
     ^
/usr/include/c++/4.8/bits/shared_ptr_base.h:1080:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::__shared_ptr<_Tp1, _Lp>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/4.8/memory:82,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr_base.h:1086:5: note: template<class _Tp, __gnu_cxx::_Lock_policy _Lp> bool std::operator<=(const std::__shared_ptr<_Tp, _Lp>&, std::nullptr_t)
     operator<=(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
     ^
/usr/include/c++/4.8/bits/shared_ptr_base.h:1086:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::__shared_ptr<_Tp, _Lp>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/4.8/memory:82,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr_base.h:1091:5: note: template<class _Tp, __gnu_cxx::_Lock_policy _Lp> bool std::operator<=(std::nullptr_t, const std::__shared_ptr<_Tp, _Lp>&)
     operator<=(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept
     ^
/usr/include/c++/4.8/bits/shared_ptr_base.h:1091:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   cannot convert 's[((int)i)]' (type 'std::string {aka std::basic_string<char>}') to type 'std::nullptr_t'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/memory:82:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr.h:378:5: note: template<class _Tp1, class _Tp2> bool std::operator<=(const std::shared_ptr<_Tp1>&, const std::shared_ptr<_Tp2>&)
     operator<=(const shared_ptr<_Tp1>& __a,
     ^
/usr/include/c++/4.8/bits/shared_ptr.h:378:5: note:   template argument deduction/substitution failed:
b16.cpp:8:39: note:   'std::string {aka std::basic_string<char>}' is not derived from 'const std::shared_ptr<_Tp1>'
         if ((s[i] >= '0') && (s[i] <= '9')) 

                                       ^
In file included from /usr/include/c++/4.8/memory:82:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:81,
                 from b16.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr.h:384:5: note: template<class _Tp> bool std::operator<=(const std::shared_ptr<_Tp1>&, std::nullptr_t)
     operator<=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
     ^
/usr/include/c++/4.8/bits/shared_ptr.h:384:5: note:   template argument deduction/substituti

Cum funcționează evaluarea?