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View Compilation Error

0_0_30878748_25133.cpp: In function 'void BFS()':
0_0_30878748_25133.cpp:26:13: error: reference to 'begin' is ambiguous
       q.str=begin;
             ^
0_0_30878748_25133.cpp:17:8: note: candidates are: std::string begin
 string begin;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:42:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52,
                 from 0_0_30878748_25133.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/initializer_list:89:5: note:                 template<class _Tp> constexpr const _Tp* std::begin(std::initializer_list<_Tp>)
     begin(initializer_list<_Tp> __ils) noexcept
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:51:0,
                 from 0_0_30878748_25133.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:87:5: note:                 template<class _Tp, long long unsigned int _Nm> _Tp* std::begin(_Tp (&)[_Nm])
     begin(_Tp (&__arr)[_Nm])
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:58:5: note:                 template<class _Container> decltype (__cont.begin()) std::begin(const _Container&)
     begin(const _Container& __cont) -> decltype(__cont.begin())
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:48:5: note:                 template<class _Container> decltype (__cont.begin()) std::begin(_Container&)
     begin(_Container& __cont) -> decltype(__cont.begin())
     ^
0_0_30878748_25133.cpp:28:10: error: reference to 'begin' is ambiguous
       mp[begin].pos=1;
          ^
0_0_30878748_25133.cpp:17:8: note: candidates are: std::string begin
 string begin;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:42:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52,
                 from 0_0_30878748_25133.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/initializer_list:89:5: note:                 template<class _Tp> constexpr const _Tp* std::begin(std::initializer_list<_Tp>)
     begin(initializer_list<_Tp> __ils) noexcept
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:51:0,
                 from 0_0_30878748_25133.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:87:5: note:                 template<class _Tp, long long unsigned int _Nm> _Tp* std::begin(_Tp (&)[_Nm])
     begin(_Tp (&__arr)[_Nm])
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:58:5: note:                 template<class _Container> decltype (__cont.begin()) std::begin(const _Container&)
     begin(const _Container& __cont) -> decltype(__cont.begin())
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:48:5: note:                 template<class _Container> decltype (__cont.begin()) std::begin(_Container&)
     begin(_Container& __cont) -> decltype(__cont.begin())
     ^
0_0_30878748_25133.cpp: In function 'int main()':
0_0_30878748_25133.cpp:83:5: error: reference to 'begin' is ambiguous
     begin="12345678x";
     ^
0_0_30878748_25133.cpp:17:8: note: candidates are: std::string begin
 string begin;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:42:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52,
                 from 0_0_30878748_25133.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/initializer_list:89:5: note:                 template<class _Tp> constexpr const _Tp* std::begin(std::initializer_list<_Tp>)
     begin(initializer_list<_Tp> __ils) noexcept
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:51:0,
                 from 0_0_30878748_25133.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:87:5: note:                 template<class _Tp, long long unsigned int _Nm> _Tp* std::begin(_Tp (&)[_Nm])
     begin(_Tp (&__arr)[_Nm])
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:58:5: note:                 template<class _Container> decltype (__cont.begin()) std::begin(const _Container&)
     begin(const _Container& __cont) -> decltype(__cont.begin())
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:48:5: note:                 template<class _Container> decltype (__cont.begin()) std::begin(_Container&)
     begin(_Container& __cont) -> decltype(__cont.begin())
     ^
0_0_30878748_25133.cpp:86:5: error: reference to 'begin' is ambiguous
     begin="";
     ^
0_0_30878748_25133.cpp:17:8: note: candidates are: std::string begin
 string begin;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:42:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52,
                 from 0_0_30878748_25133.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/initializer_list:89:5: note:                 template<class _Tp> constexpr const _Tp* std::begin(std::initializer_list<_Tp>)
     begin(initializer_list<_Tp> __ils) noexcept
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:51:0,
                 from 0_0_30878748_25133.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:87:5: note:                 template<class _Tp, long long unsigned int _Nm> _Tp* std::begin(_Tp (&)[_Nm])
     begin(_Tp (&__arr)[_Nm])
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:58:5: note:                 template<class _Container> decltype (__cont.begin()) std::begin(const _Container&)
     begin(const _Container& __cont) -> decltype(__cont.begin())
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:48:5: note:                 template<class _Container> decltype (__cont.begin()) std::begin(_Container&)
     begin(_Container& __cont) -> decltype(__cont.begin())
     ^
0_0_30878748_25133.cpp:90:10: error: reference to 'begin' is ambiguous
          begin+=s[0];
          ^
0_0_30878748_25133.cpp:17:8: note: candidates are: std::string begin
 string begin;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:42:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52,
                 from 0_0_30878748_25133.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/initializer_list:89:5: note:                 template<class _Tp> constexpr const _Tp* std::begin(std::initializer_list<_Tp>)
     begin(initializer_list<_Tp> __ils) noexcept
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:51:0,
                 from 0_0_30878748_25133.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:87:5: note:                 template<class _Tp, long long unsigned int _Nm> _Tp* std::begin(_Tp (&)[_Nm])
     begin(_Tp (&__arr)[_Nm])
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:58:5: note:                 template<class _Container> decltype (__cont.begin()) std::begin(const _Container&)
     begin(const _Container& __cont) -> decltype(__cont.begin())
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:48:5: note:                 template<class _Container> decltype (__cont.begin()) std::begin(_Container&)
     begin(_Container& __cont) -> decltype(__cont.begin())
     ^
0_0_30878748_25133.cpp:93:23: error: reference to 'begin' is ambiguous
                 if(mp[begin].pos==0)
                       ^
0_0_30878748_25133.cpp:17:8: note: candidates are: std::string begin
 string begin;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:42:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52,
                 from 0_0_30878748_25133.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/initializer_list:89:5: note:                 template<class _Tp> constexpr const _Tp* std::begin(std::initializer_list<_Tp>)
     begin(initializer_list<_Tp> __ils) noexcept
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:51:0,
                 from 0_0_30878748_25133.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:87:5: note:                 template<class _Tp, long long unsigned int _Nm> _Tp* std::begin(_Tp (&)[_Nm])
     begin(_Tp (&__arr)[_Nm])
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:58:5: note:                 template<class _Container> decltype (__cont.begin()) std::begin(const _Container&)
     begin(const _Container& __cont) -> decltype(__cont.begin())
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/range_access.h:48:5: note:                 template<class _Container> decltype (__cont.begin()) std::begin(_Container&)
     begin(_Container& __cont) -> decltype(__cont.begin())
     ^
0_0_30878748_25133.cpp:97:32: error: reference to 'begin' is ambiguous
                       for(i=mp[begin].path.size()-1;i>=0;i--)
                                ^
0_0_30878748_25133.cpp:17:8: note: candidates are: std::string begin
 string begin;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:42:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52,
       


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