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View Compilation Error

0_0_32032022_9589.cpp: In function 'void unio(int, int)':
0_0_32032022_9589.cpp:19:9: error: reference to 'rank' is ambiguous
         rank[ny]+=rank[nx];       
         ^
0_0_32032022_9589.cpp:5:23: note: candidates are: int rank [10000000]
 int n,a,b,max0,max1,i,rank[MAXN],fa[MAXN];
                       ^
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_32032022_9589.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_32032022_9589.cpp:19:19: error: reference to 'rank' is ambiguous
         rank[ny]+=rank[nx];       
                   ^
0_0_32032022_9589.cpp:5:23: note: candidates are: int rank [10000000]
 int n,a,b,max0,max1,i,rank[MAXN],fa[MAXN];
                       ^
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_32032022_9589.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_32032022_9589.cpp: In function 'int main()':
0_0_32032022_9589.cpp:29:13: error: reference to 'rank' is ambiguous
             rank[i]=1;       
             ^
0_0_32032022_9589.cpp:5:23: note: candidates are: int rank [10000000]
 int n,a,b,max0,max1,i,rank[MAXN],fa[MAXN];
                       ^
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_32032022_9589.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_32032022_9589.cpp:46:21: error: reference to 'rank' is ambiguous
             if(max1<rank[i])                
                     ^
0_0_32032022_9589.cpp:5:23: note: candidates are: int rank [10000000]
 int n,a,b,max0,max1,i,rank[MAXN],fa[MAXN];
                       ^
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_32032022_9589.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_32032022_9589.cpp:48:22: error: reference to 'rank' is ambiguous
                 max1=rank[i];
                      ^
0_0_32032022_9589.cpp:5:23: note: candidates are: int rank [10000000]
 int n,a,b,max0,max1,i,rank[MAXN],fa[MAXN];
                       ^
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_32032022_9589.cpp:2:
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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