View Compilation Error

0_0_15565079_16330.cpp: In function 'void insert(int, int)':
0_0_15565079_16330.cpp:71:8: error: reference to 'hash' is ambiguous
    bit[hash(i*LIM+j)] ++;
        ^
0_0_15565079_16330.cpp:43:5: note: candidates are: int hash(int)
 int hash(int x) {
     ^
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_15565079_16330.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/functional_hash.h:58:12: note:                 template<class _Tp> struct std::hash
     struct hash;
            ^