View Compilation Error

0_0_17239041_29033.cpp: In function 'int solve()':
0_0_17239041_29033.cpp:49:24: error: no matching function for call to 'count(int&)'
             if (count(s) == i) {
                        ^
0_0_17239041_29033.cpp:49:24: note: candidate is:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_17239041_29033.cpp:7:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3947:5: note: template<class _IIter, class _Tp> typename std::iterator_traits<_Iterator>::difference_type std::count(_IIter, _IIter, const _Tp&)
     count(_InputIterator __first, _InputIterator __last, const _Tp& __value)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3947:5: note:   template argument deduction/substitution failed:
0_0_17239041_29033.cpp:49:24: note:   candidate expects 3 arguments, 1 provided
             if (count(s) == i) {
                        ^