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View Compilation Error

0_0_21166961_5829.cpp:16:11: error: reference to 'hash' is ambiguous
  int head[hash] , next[maxn] , size ;
           ^
0_0_21166961_5829.cpp:10:11: note: candidates are: const int hash
 const int hash = 10007 ;
           ^
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++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_21166961_5829.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;
            ^
0_0_21166961_5829.cpp: In member function 'void HashMap::init()':
0_0_21166961_5829.cpp:23:10: error: 'head' was not declared in this scope
   memset(head , -1 , sizeof( head )) ;
          ^
0_0_21166961_5829.cpp: In member function 'int HashMap::insert(long long unsigned int, int)':
0_0_21166961_5829.cpp:27:15: error: reference to 'hash' is ambiguous
   int h = val%hash ;
               ^
0_0_21166961_5829.cpp:10:11: note: candidates are: const int hash
 const int hash = 10007 ;
           ^
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++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_21166961_5829.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;
            ^
0_0_21166961_5829.cpp:28:17: error: 'head' was not declared in this scope
   for ( int i = head[i] ; i != -1 ;i = next[i] )
                 ^
0_0_21166961_5829.cpp:41:16: error: 'head' was not declared in this scope
   next[size] = head[h] ;
                ^


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