foo.cpp: In function 'int main()':
foo.cpp:14:18: error: reference to 'hash' is ambiguous
               if(hash[sum]!=0){
                  ^
foo.cpp:6:5: note: candidates are: int hash [100001]
 int hash[100001],x,k,ans,sum=0,n;
     ^
In file included from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/bits/basic_string.h:3068:0,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/string:52,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/bits/locale_classes.h:40,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/bits/ios_base.h:41,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/ios:42,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/ostream:38,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/iostream:39,
                 from foo.cpp:1:
C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/bits/functional_hash.h:58:12: note:                 template<class _Tp> struct std::hash
     struct hash;
            ^
foo.cpp:15:21: error: reference to 'hash' is ambiguous
                 k=i-hash[sum];
                     ^
foo.cpp:6:5: note: candidates are: int hash [100001]
 int hash[100001],x,k,ans,sum=0,n;
     ^
In file included from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/bits/basic_string.h:3068:0,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/string:52,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/bits/locale_classes.h:40,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/bits/ios_base.h:41,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/ios:42,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/ostream:38,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/iostream:39,
                 from foo.cpp:1:
C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/bits/functional_hash.h:58:12: note:                 template<class _Tp> struct std::hash
     struct hash;
            ^
foo.cpp:19:21: error: reference to 'hash' is ambiguous
                     hash[sum]=i;
                     ^
foo.cpp:6:5: note: candidates are: int hash [100001]
 int hash[100001],x,k,ans,sum=0,n;
     ^
In file included from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/bits/basic_string.h:3068:0,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/string:52,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/bits/locale_classes.h:40,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/bits/ios_base.h:41,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/ios:42,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/ostream:38,
                 from C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/iostream:39,
                 from foo.cpp:1:
C:/TDM-GCC-32/lib/gcc/mingw32/4.9.2/include/c++/bits/functional_hash.h:58:12: note:                 template<class _Tp> struct std::hash
     struct hash;
            ^