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View Compilation Error

0_0_20978161_22859.cpp: In function 'void init()':
0_0_20978161_22859.cpp:20:16: error: reference to 'rank' is ambiguous
         f[i]=i,rank[i]=0;  
                ^
0_0_20978161_22859.cpp:8:14: note: candidates are: int rank [210]
 int f[MAXN], rank[MAXN], n, m, pos;  
              ^
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_20978161_22859.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_20978161_22859.cpp: In function 'void Union(int, int)':
0_0_20978161_22859.cpp:33:8: error: reference to 'rank' is ambiguous
     if(rank[a]>rank[b])  
        ^
0_0_20978161_22859.cpp:8:14: note: candidates are: int rank [210]
 int f[MAXN], rank[MAXN], n, m, pos;  
              ^
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_20978161_22859.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_20978161_22859.cpp:33:16: error: reference to 'rank' is ambiguous
     if(rank[a]>rank[b])  
                ^
0_0_20978161_22859.cpp:8:14: note: candidates are: int rank [210]
 int f[MAXN], rank[MAXN], n, m, pos;  
              ^
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_20978161_22859.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_20978161_22859.cpp:36:12: error: reference to 'rank' is ambiguous
         if(rank[a]==rank[b])  
            ^
0_0_20978161_22859.cpp:8:14: note: candidates are: int rank [210]
 int f[MAXN], rank[MAXN], n, m, pos;  
              ^
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_20978161_22859.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_20978161_22859.cpp:36:21: error: reference to 'rank' is ambiguous
         if(rank[a]==rank[b])  
                     ^
0_0_20978161_22859.cpp:8:14: note: candidates are: int rank [210]
 int f[MAXN], rank[MAXN], n, m, pos;  
              ^
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_20978161_22859.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_20978161_22859.cpp:37:15: error: reference to 'rank' is ambiguous
             ++rank[b];  
               ^
0_0_20978161_22859.cpp:8:14: note: candidates are: int rank [210]
 int f[MAXN], rank[MAXN], n, m, pos;  
              ^
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_20978161_22859.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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