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View Compilation Error

0_0_18030417_30324.cpp: In function 'void initUnion()':
0_0_18030417_30324.cpp:56:9: error: reference to 'rank' is ambiguous
         rank[i]=0;
         ^
0_0_18030417_30324.cpp:42:24: note: candidates are: int rank [1001]
 int N,M,K,father[maxn],rank[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++/bits/stl_algobase.h:64,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_tree.h:61,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:60,
                 from 0_0_18030417_30324.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_18030417_30324.cpp: In function 'void Union(int, int)':
0_0_18030417_30324.cpp:63:8: error: reference to 'rank' is ambiguous
     if(rank[x]<rank[y]){
        ^
0_0_18030417_30324.cpp:42:24: note: candidates are: int rank [1001]
 int N,M,K,father[maxn],rank[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++/bits/stl_algobase.h:64,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_tree.h:61,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:60,
                 from 0_0_18030417_30324.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_18030417_30324.cpp:63:16: error: reference to 'rank' is ambiguous
     if(rank[x]<rank[y]){
                ^
0_0_18030417_30324.cpp:42:24: note: candidates are: int rank [1001]
 int N,M,K,father[maxn],rank[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++/bits/stl_algobase.h:64,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_tree.h:61,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:60,
                 from 0_0_18030417_30324.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_18030417_30324.cpp:67:12: error: reference to 'rank' is ambiguous
         if(rank[x]==rank[y]) rank[x]++;
            ^
0_0_18030417_30324.cpp:42:24: note: candidates are: int rank [1001]
 int N,M,K,father[maxn],rank[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++/bits/stl_algobase.h:64,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_tree.h:61,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:60,
                 from 0_0_18030417_30324.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_18030417_30324.cpp:67:21: error: reference to 'rank' is ambiguous
         if(rank[x]==rank[y]) rank[x]++;
                     ^
0_0_18030417_30324.cpp:42:24: note: candidates are: int rank [1001]
 int N,M,K,father[maxn],rank[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++/bits/stl_algobase.h:64,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_tree.h:61,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:60,
                 from 0_0_18030417_30324.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_18030417_30324.cpp:67:30: error: reference to 'rank' is ambiguous
         if(rank[x]==rank[y]) rank[x]++;
                              ^
0_0_18030417_30324.cpp:42:24: note: candidates are: int rank [1001]
 int N,M,K,father[maxn],rank[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++/bits/stl_algobase.h:64,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_tree.h:61,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:60,
                 from 0_0_18030417_30324.cpp:1:
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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