Rezumat problemă

Detalii

Problema	Gray	Operații I/O	tastatură/ecran
Limita timp	0.1 secunde	Limita memorie	Total: 64 MB / Stivă 8 MB
Id soluție	#54278164	Utilizator	Razvan Moraru (RazvanA_fr)
Fișier	gray.cpp	Dimensiune	4.89 KB
Data încărcării	24 Noiembrie 2024, 16:19	Scor / rezultat	Eroare de compilare

Evaluare

Mesaj compilare

gray.cpp:45:14: error: redefinition of 'std::ifstream fin'
 ifstream fin ("plopi2.in");

              ^
gray.cpp:5:10: error: 'std::ifstream fin' previously declared here
 ifstream fin ("spectacole.in");

          ^
gray.cpp:46:15: error: redefinition of 'std::ofstream fout'
 ofstream fout ("plopi2.out");

               ^
gray.cpp:6:10: error: 'std::ofstream fout' previously declared here
 ofstream fout ("spectacole.out");

          ^
gray.cpp:48:5: error: redefinition of 'int n'
 int n, v[101], k, s;

     ^
gray.cpp:8:5: error: 'int n' previously declared here
 int n;

     ^
gray.cpp: In function 'int main()':
gray.cpp:50:5: error: redefinition of 'int main()'
 int main()

     ^
gray.cpp:18:5: error: 'int main()' previously defined here
 int main()

     ^
gray.cpp: At global scope:
gray.cpp:74:13: error: redefinition of 'std::ifstream fin'
 ifstream fin("eureni.in");

             ^
gray.cpp:5:10: error: 'std::ifstream fin' previously declared here
 ifstream fin ("spectacole.in");

          ^
gray.cpp:75:14: error: redefinition of 'std::ofstream fout'
 ofstream fout("eureni.out");

              ^
gray.cpp:6:10: error: 'std::ofstream fout' previously declared here
 ofstream fout ("spectacole.out");

          ^
gray.cpp:77:5: error: redefinition of 'int n'
 int n , S , e;

     ^
gray.cpp:8:5: error: 'int n' previously declared here
 int n;

     ^
gray.cpp: In function 'int main()':
gray.cpp:88:5: error: redefinition of 'int main()'
 int main()

     ^
gray.cpp:18:5: error: 'int main()' previously defined here
 int main()

     ^
gray.cpp: At global scope:
gray.cpp:120:13: error: redefinition of 'std::ifstream fin'
 ifstream fin("concert.in");

             ^
gray.cpp:5:10: error: 'std::ifstream fin' previously declared here
 ifstream fin ("spectacole.in");

          ^
gray.cpp:121:14: error: redefinition of 'std::ofstream fout'
 ofstream fout("concert.out");

              ^
gray.cpp:6:10: error: 'std::ofstream fout' previously declared here
 ofstream fout ("spectacole.out");

          ^
gray.cpp:123:5: error: redefinition of 'int n'
 int n;

     ^
gray.cpp:8:5: error: 'int n' previously declared here
 int n;

     ^
gray.cpp:130:9: error: conflicting declaration 'Hot a [1001]'
 } a[1001];

         ^
gray.cpp:12:3: error: 'a' has a previous declaration as 'Concert a [1001]'
 } a[1001];

   ^
gray.cpp:131:5: error: redefinition of 'int S'
 int S;

     ^
gray.cpp:77:9: error: 'int S' previously declared here
 int n , S , e;

         ^
gray.cpp: In function 'int main()':
gray.cpp:138:5: error: redefinition of 'int main()'
 int main()

     ^
gray.cpp:18:5: error: 'int main()' previously defined here
 int main()

     ^
gray.cpp:144:21: error: 'struct Concert' has no member named 'minn'
         fin >> a[i].minn >> c >> a[i].secc;

                     ^
gray.cpp:144:39: error: 'struct Concert' has no member named 'secc'
         fin >> a[i].minn >> c >> a[i].secc;

                                       ^
gray.cpp:146:14: error: 'struct Concert' has no member named 'poz'
         a[i].poz = i;

              ^
gray.cpp:147:14: error: 'struct Concert' has no member named 'dur'
         a[i].dur = a[i].minn * 60 + a[i].secc;

              ^
gray.cpp:147:25: error: 'struct Concert' has no member named 'minn'
         a[i].dur = a[i].minn * 60 + a[i].secc;

                         ^
gray.cpp:147:42: error: 'struct Concert' has no member named 'secc'
         a[i].dur = a[i].minn * 60 + a[i].secc;

                                          ^
gray.cpp:155:22: error: 'struct Concert' has no member named 'dur'
         if(S >= a[i].dur)

                      ^
gray.cpp:157:23: error: 'struct Concert' has no member named 'dur'
             S -= a[i].dur;

                       ^
gray.cpp:158:29: error: 'struct Concert' has no member named 'poz'
             v[++cnt] = a[i].poz;

                             ^
gray.cpp:153:29: warning: unused variable 'nr' [-Wunused-variable]
     int cnt = 0 , v[1001] , nr = 0;

                             ^
gray.cpp: At global scope:
gray.cpp:178:13: error: redefinition of 'std::ifstream fin'
 ifstream fin("masini.in");

             ^
gray.cpp:5:10: error: 'std::ifstream fin' previously declared here
 ifstream fin ("spectacole.in");

          ^
gray.cpp:179:14: error: redefinition of 'std::ofstream fout'
 ofstream fout("masini.out");

              ^
gray.cpp:6:10: error: 'std::ofstream fout' previously declared here
 ofstream fout ("spectacole.out");

          ^
gray.cpp:181:5: error: redefinition of 'int n'
 int n , T , a[10001];

     ^
gray.cpp:8:5: error: 'int n' previously declared here
 int n;

     ^
gray.cpp:181:20: error: conflicting declaration 'int a [10001]'
 int n , T , a[10001];

                    ^
gray.cpp:12:3: error: 'a' has a previous declaration as 'Concert a [1001]'
 } a[1001];

   ^
gray.cpp:182:15: error: redefinition of 'int s'
 int cnt = 0 , s = 0;

               ^
gray.cpp:48:19: error: 'int s' previously declared here
 int n, v[101], k, s;

                   ^
gray.cpp: In function 'int main()':
gray.cpp:184:5: error: redefinition of 'int main()'
 int main()

     ^
gray.cpp:18:5: error: 'int main()' previously defined here
 int main()

     ^
gray.cpp:188:19: error: cannot bind 'std::basic_istream<char>' lvalue to 'std::basic_istream<char>&&'
         fin >> a[i];

                   ^
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 gray.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 = Concert]'
     operator>>(basic_istream<_CharT, _Traits>&& __is, _Tp& __x)
     ^
gray.cpp:194:11: error: no match for 'operator+=' (operand types are 'int' and 'Concert')
         s += a[i];

           ^
gray.cpp: At global scope:
gray.cpp:209:14: error: redefinition of 'int n'
 int N[101] , n , m , c;

              ^
gray.cpp:8:5: error: 'int n' previously declared here
 int n;

     ^
gray.cpp: In function 'int main()':
gray.cpp:215:5: error: redefinition of 'int main()'
 int main()

     ^
gray.cpp:18:5: error: 'int main()' previously defined here
 int main()

     ^
gray.cpp:220:34: error: no matching function for call to 'sort(int*, int*, <unresolved overloaded function type>)'
     sort(N + 1, N + m + 1 , mamic);

                                  ^
gray.cpp:220:34: note: candidates are:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:5447:5: note: template<class _RAIter> void std::sort(_RAIter, _RAIter)
     sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
     ^
/usr/include/c++/4.8/bits/stl_algo.h:5447:5: note:   template argument deduction/substitution failed:
gray.cpp:220:34: note:   candidate expects 2 arguments, 3 provided
     sort(N + 1, N + m + 1 , mamic);

                                  ^
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:5483:5: note: template<class _RAIter, class _Compare> void std::sort(_RAIter, _RAIter, _Compare)
     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
     ^
/usr/include/c++/4.8/bits/stl_algo.h:5483:5: note:   template argument deduction/substitution failed:
gray.cpp:220:34: note:   couldn't deduce template parameter '_Compare'
     sort(N + 1, N + m + 1 , mamic);

                                  ^
gray.cpp: At global scope:
gray.cpp:253:13: error: redefinition of 'std::ifstream fin'
 ifstream fin("cladire2.in");

             ^
gray.cpp:5:10: error: 'std::ifstream fin' previously declared here
 ifstream fin ("spectacole.in");

          ^
gray.cpp:254:14: error: redefinition of 'std::ofstream fout'
 ofstream fout("cladire2.out");

              ^
gray.cpp:6:10: error: 'std::ofstream fout' previously declared here
 ofstream fout ("spectacole.out");

          ^
gray.cpp:256:5: error: redefinition of 'int n'
 int n;

     ^
gray.cpp:8:5: error: 'int n' previously declared here
 int n;

     ^
gray.cpp:257:8: error: redefinition of 'struct Hot'
 struct Hot

        ^
gray.cpp:124:8: error: previous definition of 'struct Hot'
 struct Hot

        ^
gray.cpp:261:10: error: invalid type in declaration before ';' token
 } a[1001];

          ^
gray.cpp:261:10: error: conflicting declaration 'int a [1001]'
gray.cpp:12:3: error: 'a' has a previous declaration as 'Concert a [1001]'
 } a[1001];

   ^
gray.cpp: In function 'bool maimic(Hot, Hot)':
gray.cpp:264:6: error: redefinition of 'bool maimic(Hot, Hot)'
 bool maimic(Hot a , Hot b)

      ^
gray.cpp:133:6: error: 'bool maimic(Hot, Hot)' previously defined here
 bool maimic(Hot a , Hot b)

      ^
gray.cpp:266:14: error: 'struct Hot' has no member named 'av'
     return a.av > b.av;

              ^
gray.cpp:266:21: error: 'struct Hot' has no member named 'av'
     return a.av > b.av;

                     ^
gray.cpp: In function 'int main()':
gray.cpp:269:5: error: redefinition of 'int main()'
 int main()

     ^
gray.cpp:18:5: error: 'int main()' previously defined here
 int main()

     ^
gray.cpp:274:21: error: 'struct Concert' has no member named 'nr'
         cin >> a[i].nr >> a[i].val;

                     ^
gray.cpp:274:32: error: 'struct Concert' has no member named 'val'
         cin >> a[i].nr >> a[i].val;

                                ^
gray.cpp:275:14: error: 'struct Concert' has no member named 'av'
         a[i].av = (double)a[i].val / a[i].nr;

              ^
gray.cpp:275:32: error: 'struct Concert' has no member named 'val'
         a[i].av = (double)a[i].val / a[i].nr;

                                ^
gray.cpp:275:43: error: 'struct Concert' has no member named 'nr'
         a[i].av = (double)a[i].val / a[i].nr;

                                           ^
gray.cpp:282:17: error: 'struct Concert' has no member named 'nr'
         if(a[i].nr <= Gmax)

                 ^
gray.cpp:284:23: error: 'struct Concert' has no member named 'val'
             S += a[i].val;

                       ^
gray.cpp:285:26: error: 'struct Concert' has no member named 'nr'
             Gmax -= a[i].nr;

                          ^
gray.cpp:289:31: error: 'struct Concert' has no member named 'val'
             S += (double)a[i].val * Gmax / a[i].nr;

                               ^
gray.cpp:289:49: error: 'struct Concert' has no member named 'nr'
             S += (double)a[i].val * Gmax / a[i].nr;

                                                 ^
gray.cpp: In function 'int main()':
gray.cpp:302:5: error: redefinition of 'int main()'
 int main()

     ^
gray.cpp:18:5: error: 'int main()' previously defined here
 int main()

     ^
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h: In instantiation of 'void std::__insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = Concert*; _Compare = bool (*)(Hot, Hot)]':
/usr/include/c++/4.8/bits/stl_algo.h:2226:70:   required from 'void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = Concert*; _Compare = bool (*)(Hot, Hot)]'
/usr/include/c++/4.8/bits/stl_algo.h:5500:55:   required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = Concert*; _Compare = bool (*)(Hot, Hot)]'
gray.cpp:151:36:   required from here
/usr/include/c++/4.8/bits/stl_algo.h:2159:29: error: could not convert '* __i' from 'Concert' to 'Hot'
    if (__comp(*__i, *__first))
                             ^
/usr/include/c++/4.8/bits/stl_algo.h: In instantiation of 'void std::__insertion_sort(_RandomAccessIterator, _RandomAccessIterator) [with _RandomAccessIterator = Concert*]':
/usr/include/c++/4.8/bits/stl_algo.h:2211:62:   required from 'void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator) [with _RandomAccessIterator = Concert*]'
/usr/include/c++/4.8/bits/stl_algo.h:5462:47:   required from 'void std::sort(_RAIter, _RAIter) [with _RAIter = Concert*]'
gray.cpp:190:27:   required from here
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: error: no match for 'operator<' (operand types are 'Concert' and 'Concert')
    if (*__i < *__first)
             ^
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note: candidates are:
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 gray.cpp:1:
/usr/include/c++/4.8/bits/regex.h:1334:5: 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:1334:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::sub_match<_BiIter>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/regex.h:1254:5: 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:1254:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::sub_match<_BiIter>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/regex.h:1177:5: 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:1177:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::sub_match<_BiIter>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/regex.h:1103:5: 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:1103:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   mismatched types 'const typename std::iterator_traits<_Iter>::value_type*' and 'Concert'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/regex.h:1029:5: 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:1029:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::sub_match<_BiIter>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/regex.h:955:5: 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:955:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'std::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/regex.h:879:5: 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:879:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::sub_match<_BiIter>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/forward_list.h:1359:5: 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:1359:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::forward_list<_Tp, _Alloc>'
    if (*__i < *__first)
             ^
In file included from /usr/include/c++/4.8/mutex:43:0,
                 from /usr/include/c++/4.8/condition_variable:39,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:101,
                 from gray.cpp:1:
/usr/include/c++/4.8/system_error:250:3: note: bool std::operator<(const std::error_condition&, const std::error_condition&)
   operator<(const error_condition& __lhs,
   ^
/usr/include/c++/4.8/system_error:250:3: note:   no known conversion for argument 1 from 'Concert' to 'const std::error_condition&'
/usr/include/c++/4.8/system_error:177:3: note: bool std::operator<(const std::error_code&, const std::error_code&)
   operator<(const error_code& __lhs, const error_code& __rhs) noexcept
   ^
/usr/include/c++/4.8/system_error:177:3: note:   no known conversion for argument 1 from 'Concert' to 'const std::error_code&'
In file included from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:94:0,
                 from gray.cpp:1:
/usr/include/c++/4.8/valarray:1181:1: note: template<class _Tp> std::_Expr<std::_BinClos<std::__less, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__less, _Tp>::result_type> std::operator<(const _Tp&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(<, __less)
 ^
/usr/include/c++/4.8/valarray:1181:1: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::valarray<_Tp>'
    if (*__i < *__first)
             ^
In file included from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:94:0,
                 from gray.cpp:1:
/usr/include/c++/4.8/valarray:1181:1: note: template<class _Tp> std::_Expr<std::_BinClos<std::__less, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__less, _Tp>::result_type> std::operator<(const std::valarray<_Tp>&, const _Tp&)
 _DEFINE_BINARY_OPERATOR(<, __less)
 ^
/usr/include/c++/4.8/valarray:1181:1: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::valarray<_Tp>'
    if (*__i < *__first)
             ^
In file included from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:94:0,
                 from gray.cpp:1:
/usr/include/c++/4.8/valarray:1181:1: note: template<class _Tp> std::_Expr<std::_BinClos<std::__less, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__less, _Tp>::result_type> std::operator<(const std::valarray<_Tp>&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(<, __less)
 ^
/usr/include/c++/4.8/valarray:1181:1: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::valarray<_Tp>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/valarray_after.h:416:5: note: template<class _Dom> std::_Expr<std::_BinClos<std::__less, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__less, 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(<, __less)
     ^
/usr/include/c++/4.8/bits/valarray_after.h:416:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::valarray<typename _Dom::value_type>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/valarray_after.h:416:5: note: template<class _Dom> std::_Expr<std::_BinClos<std::__less, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__less, 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(<, __less)
     ^
/usr/include/c++/4.8/bits/valarray_after.h:416:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/valarray_after.h:416:5: note: template<class _Dom> std::_Expr<std::_BinClos<std::__less, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__less, 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(<, __less)
     ^
/usr/include/c++/4.8/bits/valarray_after.h:416:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/valarray_after.h:416:5: note: template<class _Dom> std::_Expr<std::_BinClos<std::__less, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__less, 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(<, __less)
     ^
/usr/include/c++/4.8/bits/valarray_after.h:416:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/valarray_after.h:416:5: note: template<class _Dom1, class _Dom2> std::_Expr<std::_BinClos<std::__less, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__less, 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(<, __less)
     ^
/usr/include/c++/4.8/bits/valarray_after.h:416:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_stack.h:261:5: 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:261:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::stack<_Tp, _Seq>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_multiset.h:756:5: 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:756:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::multiset<_Key, _Compare, _Alloc>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_set.h:771:5: 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:771:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::set<_Key, _Compare, _Alloc>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_queue.h:286:5: 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:286:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::queue<_Tp, _Seq>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr.h:373:5: 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:373:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   cannot convert '* __i' (type 'Concert') to type 'std::nullptr_t'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr.h:368:5: 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:368:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::shared_ptr<_Tp1>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr.h:359:5: 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:359:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::shared_ptr<_Tp1>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr_base.h:1075:5: 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:1075:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   cannot convert '* __i' (type 'Concert') to type 'std::nullptr_t'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr_base.h:1070:5: 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:1070:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::__shared_ptr<_Tp, _Lp>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr_base.h:1061:5: 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:1061:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::__shared_ptr<_Tp1, _Lp>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/unique_ptr.h:540:5: 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:540:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   cannot convert '* __i' (type 'Concert') to type 'std::nullptr_t'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/unique_ptr.h:534:5: 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:534:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/unique_ptr.h:523:5: 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:523:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_multimap.h:881:5: 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:881:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::multimap<_Key, _Tp, _Compare, _Alloc>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_map.h:979:5: 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:979:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::map<_Key, _Tp, _Compare, _Alloc>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_tree.h:917:5: 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:917:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_list.h:1631:5: 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:1631:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::list<_Tp, _Alloc>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_deque.h:1975:5: 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:1975:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::deque<_Tp, _Alloc>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_deque.h:281:5: 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:281:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_deque.h:273:5: 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:273:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/tuple:824:5: 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:824:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::tuple<_Elements ...>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/array:238:5: 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>& __a, const array<_Tp, _Nm>& __b)
     ^
/usr/include/c++/4.8/array:238:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::array<_Tp, _Nm>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_vector.h:1421:5: 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:1421:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::vector<_Tp, _Alloc>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2593:5: 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:2593:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   mismatched types 'const _CharT*' and 'Concert'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2581:5: 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:2581:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2569:5: 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:2569:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:1061:5: 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:1061:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::move_iterator<_Iterator>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:1055:5: 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:1055:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::move_iterator<_Iterator>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:347:5: 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:347:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::reverse_iterator<_Iterator>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_iterator.h:297:5: 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:297:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::reverse_iterator<_Iterator>'
    if (*__i < *__first)
             ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/stl_pair.h:220:5: 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:220:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:2137:13: note:   'Concert' is not derived from 'const std::pair<_T1, _T2>'
    if (*__i < *__first)
             ^
/usr/include/c++/4.8/bits/stl_algo.h: In instantiation of 'void std::__heap_select(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = Concert*; _Compare = bool (*)(Hot, Hot)]':
/usr/include/c++/4.8/bits/stl_algo.h:5349:59:   required from 'void std::partial_sort(_RAIter, _RAIter, _RAIter, _Compare) [with _RAIter = Concert*; _Compare = bool (*)(Hot, Hot)]'
/usr/include/c++/4.8/bits/stl_algo.h:2332:68:   required from 'void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = Concert*; _Size = int; _Compare = bool (*)(Hot, Hot)]'
/usr/include/c++/4.8/bits/stl_algo.h:5499:44:   required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = Concert*; _Compare = bool (*)(Hot, Hot)]'
gray.cpp:151:36:   required from here
/usr/include/c++/4.8/bits/stl_algo.h:1948:27: error: could not convert '* __i' from 'Concert' to 'Hot'
  if (__comp(*__i, *__first))
                           ^
/usr/include/c++/4.8/bits/stl_algo.h: In instantiation of 'void std::__move_median_to_first(_Iterator, _Iterator, _Iterator, _Iterator, _Compare) [with _Iterator = Concert*; _Compare = bool (*)(Hot, Hot)]':
/usr/include/c++/4.8/bits/stl_algo.h:2295:13:   required from '_RandomAccessIterator std::__unguarded_partition_pivot(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = Concert*; _Compare = bool (*)(Hot, Hot)]'
/usr/include/c++/4.8/bits/stl_algo.h:2337:62:   required from 'void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = Concert*; _Size = int; _Compare = bool (*)(Hot, Hot)]'
/usr/include/c++/4.8/bits/stl_algo.h:5499:44:   required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = Concert*; _Compare = bool (*)(Hot, Hot)]'
gray.cpp:151:36:   required from here
/usr/include/c++/4.8/bits/stl_algo.h:114:28: error: could not convert '* __a' from 'Concert' to 'Hot'
       if (__comp(*__a, *__b))
                            ^
/usr/include/c++/4.8/bits/stl_algo.h:116:25: error: could not convert '* __b' from 'Concert' to 'Hot'
    if (__comp(*__b, *__c))
                         ^
/usr/include/c++/4.8/bits/stl_algo.h:118:30: error: could not convert '* __a' from 'Concert' to 'Hot'
    else if (__comp(*__a, *__c))
                              ^
/usr/include/c++/4.8/bits/stl_algo.h:123:33: error: could not convert '* __a' from 'Concert' to 'Hot'
       else if (__comp(*__a, *__c))
                                 ^
/usr/include/c++/4.8/bits/stl_algo.h:125:33: error: could not convert '* __b' from 'Concert' to 'Hot'
       else if (__comp(*__b, *__c))
                                 ^
/usr/include/c++/4.8/bits/stl_algo.h: In instantiation of '_RandomAccessIterator std::__unguarded_partition(_RandomAccessIterator, _RandomAccessIterator, const _Tp&, _Compare) [with _RandomAccessIterator = Concert*; _Tp = Concert; _Compare = bool (*)(Hot, Hot)]':
/usr/include/c++/4.8/bits/stl_algo.h:2296:78:   required from '_RandomAccessIterator std::__unguarded_partition_pivot(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = Concert*; _Compare = bool (*)(Hot, Hot)]'
/usr/include/c++/4.8/bits/stl_algo.h:2337:62:   required from 'void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = Concert*; _Size = int; _Compare = bool (*)(Hot, Hot)]'
/usr/include/c++/4.8/bits/stl_algo.h:5499:44:   required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = Concert*; _Compare = bool (*)(Hot, Hot)]'
gray.cpp:151:36:   required from here
/usr/include/c++/4.8/bits/stl_algo.h:2263:35: error: could not convert '* __first' from 'Concert' to 'Hot'
    while (__comp(*__first, __pivot))
                                   ^
/usr/include/c++/4.8/bits/stl_algo.h:2266:34: error: could not convert '__pivot' from 'const Concert' to 'Hot'
    while (__comp(__pivot, *__last))
                                  ^
/usr/include/c++/4.8/bits/stl_algo.h: In instantiation of 'void std::__heap_select(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator) [with _RandomAccessIterator = Concert*]':
/usr/include/c++/4.8/bits/stl_algo.h:5308:51:   required from 'void std::partial_sort(_RAIter, _RAIter, _RAIter) [with _RAIter = Concert*]'
/usr/include/c++/4.8/bits/stl_algo.h:2310:60:   required from 'void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size) [with _RandomAccessIterator = Concert*; _Size = int]'
/usr/include/c++/4.8/bits/stl_algo.h:5461:36:   required from 'void std::sort(_RAIter, _RAIter) [with _RAIter = Concert*]'
gray.cpp:190:27:   required from here
/usr/include/c++/4.8/bits/stl_algo.h:1935:11: error: no match for 'operator<' (operand types are 'Concert' and 'Concert')
  if (*__i < *__first)
           ^
/usr/include/c++/4.8/bits/stl_algo.h:1935:11: note: candidates are:
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 gray.cpp:1:
/usr/include/c++/4.8/bits/regex.h:1334:5: 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:1334:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:1935:11: note:   'Concert' is not derived from 'const std::sub_match<_BiIter>'
  if (*__i < *__first)
           ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/regex.h:1254:5: 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:1254:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
                 from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64,
                 from gray.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:1935:11: note:   'Concert' is not derived from 'const std::sub_match<_BiIter>'
  if (*__i < *__first)
           ^
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 gray.cpp:1:
/usr/include/c++/4.8/bits/regex.h:1177:5: 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,
     ^

Cum funcționează evaluarea?