/in/foo.cc: In function 'void solve()':
/in/foo.cc:56:18: error: 'std::vector<int>::iterator {aka class __gnu_cxx::__normal_iterator<int*, std::vector<int> >}' has no member named 's'
  sort(s.begin(). s.end());
                  ^
/in/foo.cc:57:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < s.size(); i++) idx[s[i]] = i;
                 ~~^~~~~~~~~~
/in/foo.cc:58:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < r0.size(); i++) {
                 ~~^~~~~~~~~~~
/in/foo.cc:62:13: error: no match for 'operator!=' (operand types are '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, int> > >::value_type {aka std::pair<int, int>}' and 'int')
    if(r0[i] != c) {cout << i + 1 << endl; exit(0);}
              
In file included from /usr/include/c++/6/iosfwd:40:0,
                 from /usr/include/c++/6/ios:38,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/postypes.h:221:5: note: candidate: template<class _StateT> bool std::operator!=(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
     operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
     ^~~~~~~~
/usr/include/c++/6/bits/postypes.h:221:5: note:   template argument deduction/substitution failed:
/in/foo.cc:62:16: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, int> > >::value_type {aka std::pair<int, int>}' is not derived from 'const std::fpos<_StateT>'
    if(r0[i] != c) {cout << i + 1 << endl; exit(0);}
                ^
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/stl_pair.h:448:5: note: candidate: 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++/6/bits/stl_pair.h:448:5: note:   template argument deduction/substitution failed:
/in/foo.cc:62:16: note:   mismatched types 'const std::pair<_T1, _T2>' and 'int'
    if(r0[i] != c) {cout << i + 1 << endl; exit(0);}
                ^
In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/stl_iterator.h:304:5: note: candidate: 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++/6/bits/stl_iterator.h:304:5: note:   template argument deduction/substitution failed:
/in/foo.cc:62:16: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, int> > >::value_type {aka std::pair<int, int>}' is not derived from 'const std::reverse_iterator<_Iterator>'
    if(r0[i] != c) {cout << i + 1 << endl; exit(0);}
                ^
In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/stl_iterator.h:361:5: note: candidate: 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++/6/bits/stl_iterator.h:361:5: note:   template argument deduction/substitution failed:
/in/foo.cc:62:16: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, int> > >::value_type {aka std::pair<int, int>}' is not derived from 'const std::reverse_iterator<_Iterator>'
    if(r0[i] != c) {cout << i + 1 << endl; exit(0);}
                ^
In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/stl_iterator.h:1125:5: note: candidate: template<class _IteratorL, class _IteratorR> bool std::operator!=(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)
     operator!=(const move_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/6/bits/stl_iterator.h:1125:5: note:   template argument deduction/substitution failed:
/in/foo.cc:62:16: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, int> > >::value_type {aka std::pair<int, int>}' is not derived from 'const std::move_iterator<_IteratorL>'
    if(r0[i] != c) {cout << i + 1 << endl; exit(0);}
                ^
In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/stl_iterator.h:1131:5: note: candidate: template<class _Iterator> bool std::operator!=(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)
     operator!=(const move_iterator<_Iterator>& __x,
     ^~~~~~~~
/usr/include/c++/6/bits/stl_iterator.h:1131:5: note:   template argument deduction/substitution failed:
/in/foo.cc:62:16: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, int> > >::value_type {aka std::pair<int, int>}' is not derived from 'const std::move_iterator<_IteratorL>'
    if(r0[i] != c) {cout << i + 1 << endl; exit(0);}
                ^
In file included from /usr/include/c++/6/string:41:0,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/allocator.h:158:5: note: candidate: template<class _T1, class _T2> bool std::operator!=(const std::allocator<_CharT>&, const std::allocator<_T2>&)
     operator!=(const allocator<_T1>&, const allocator<_T2>&)
     ^~~~~~~~
/usr/include/c++/6/bits/allocator.h:158:5: note:   template argument deduction/substitution failed:
/in/foo.cc:62:16: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, int> > >::value_type {aka std::pair<int, int>}' is not derived from 'const std::allocator<_CharT>'
    if(r0[i] != c) {cout << i + 1 << endl; exit(0);}
                ^
In file included from /usr/include/c++/6/string:41:0,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/allocator.h:164:5: note: candidate: template<class _Tp> bool std::operator!=(const std::allocator<_CharT>&, const std::allocator<_CharT>&)
     operator!=(const allocator<_Tp>&, const allocator<_Tp>&)
     ^~~~~~~~
/usr/include/c++/6/bits/allocator.h:164:5: note:   template argument deduction/substitution failed:
/in/foo.cc:62:16: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, int> > >::value_type {aka std::pair<int, int>}' is not derived from 'const