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View Compilation Error

0_0_36446620_23826.cpp: In function 'void init(int)':
0_0_36446620_23826.cpp:12:2: error: reference to 'rank' is ambiguous
  rank=n;
  ^
0_0_36446620_23826.cpp:8:13: note: candidates are: int rank
 int A[maxn],rank;
             ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/move.h:57:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/utility:70,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:60,
                 from 0_0_36446620_23826.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_36446620_23826.cpp: In function 'void Union(int, int)':
0_0_36446620_23826.cpp:24:3: error: reference to 'rank' is ambiguous
   rank--;
   ^
0_0_36446620_23826.cpp:8:13: note: candidates are: int rank
 int A[maxn],rank;
             ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/move.h:57:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/utility:70,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:60,
                 from 0_0_36446620_23826.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_36446620_23826.cpp: In function 'int main()':
0_0_36446620_23826.cpp:38:17: error: reference to 'rank' is ambiguous
   printf("%d\n",rank-1);
                 ^
0_0_36446620_23826.cpp:8:13: note: candidates are: int rank
 int A[maxn],rank;
             ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/move.h:57:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/utility:70,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:60,
                 from 0_0_36446620_23826.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^


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