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View Compilation Error

0_0_17352160_17363.cpp: In function 'bool dfs(int, int, int)':
0_0_17352160_17363.cpp:32:8: error: reference to 'hash' is ambiguous
     if(hash[st]==lim) return 0;
        ^
0_0_17352160_17363.cpp:19:6: note: candidates are: char hash [1048576]
 char hash[1<<20];
      ^
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 GCC4.9.2/x86_64-w64-mingw32/include/c++/queue:61,
                 from 0_0_17352160_17363.cpp:4:
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_17352160_17363.cpp:34:5: error: reference to 'hash' is ambiguous
     hash[st]=lim;
     ^
0_0_17352160_17363.cpp:19:6: note: candidates are: char hash [1048576]
 char hash[1<<20];
      ^
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 GCC4.9.2/x86_64-w64-mingw32/include/c++/queue:61,
                 from 0_0_17352160_17363.cpp:4:
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_17352160_17363.cpp: In function 'int main()':
0_0_17352160_17363.cpp:49:16: error: reference to 'hash' is ambiguous
         memset(hash,-1,sizeof(hash));
                ^
0_0_17352160_17363.cpp:19:6: note: candidates are: char hash [1048576]
 char hash[1<<20];
      ^
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 GCC4.9.2/x86_64-w64-mingw32/include/c++/queue:61,
                 from 0_0_17352160_17363.cpp:4:
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_17352160_17363.cpp:49:31: error: reference to 'hash' is ambiguous
         memset(hash,-1,sizeof(hash));
                               ^
0_0_17352160_17363.cpp:19:6: note: candidates are: char hash [1048576]
 char hash[1<<20];
      ^
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 GCC4.9.2/x86_64-w64-mingw32/include/c++/queue:61,
                 from 0_0_17352160_17363.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/functional_hash.h:58:12: note:                 template<class _Tp> struct std::hash
     struct hash;
            ^


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