View Compilation Error

0_0_13081822_20931.cpp: In function 'void work()':
0_0_13081822_20931.cpp:163:16: error: reference to 'hash' is ambiguous
         h[i] = hash(a[i]);
                ^
0_0_13081822_20931.cpp:84:4: note: candidates are: long long int hash(long long int)
 LL hash(LL value) {
    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_bvector.h:1181:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/vector:65,
                 from 0_0_13081822_20931.cpp:9:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/functional_hash.h:58:12: note:                 template<class _Tp> struct std::hash
     struct hash;
            ^