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View Compilation Error

0_0_16316514_18676.cpp:76:2: error: reference to 'hash' is ambiguous
  hash HASH;
  ^
0_0_16316514_18676.cpp:11:8: note: candidates are: struct hash
 struct hash{
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:3068:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/stdexcept:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/array:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/tuple:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_map.h:63,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/map:61,
                 from 0_0_16316514_18676.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/functional_hash.h:58:12: note:                 template<class _Tp> struct std::hash
     struct hash;
            ^
0_0_16316514_18676.cpp:76:2: error: 'hash' does not name a type
  hash HASH;
  ^
0_0_16316514_18676.cpp: In member function 'int ing::init()':
0_0_16316514_18676.cpp:80:3: error: 'HASH' was not declared in this scope
   HASH.clear();
   ^
0_0_16316514_18676.cpp: In member function 'int ing::BSGS(int)':
0_0_16316514_18676.cpp:92:14: error: 'HASH' was not declared in this scope
    int tmp = HASH.find(b);
              ^


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