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View Compilation Error

0_0_14859229_4000.cpp: In function 'void Union(int, int, int, int&)':
0_0_14859229_4000.cpp:46:6: error: reference to 'rank' is ambiguous
   if(rank[x]<=rank[y]){
      ^
0_0_14859229_4000.cpp:22:46: note: candidates are: int rank [20005]
 int a[QueryLen],parent[NodeLen],num[NodeLen],rank[NodeLen];
                                              ^
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_14859229_4000.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_14859229_4000.cpp:46:15: error: reference to 'rank' is ambiguous
   if(rank[x]<=rank[y]){
               ^
0_0_14859229_4000.cpp:22:46: note: candidates are: int rank [20005]
 int a[QueryLen],parent[NodeLen],num[NodeLen],rank[NodeLen];
                                              ^
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_14859229_4000.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_14859229_4000.cpp:49:7: error: reference to 'rank' is ambiguous
    if(rank[x]==rank[y])rank[y]++;
       ^
0_0_14859229_4000.cpp:22:46: note: candidates are: int rank [20005]
 int a[QueryLen],parent[NodeLen],num[NodeLen],rank[NodeLen];
                                              ^
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_14859229_4000.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_14859229_4000.cpp:49:16: error: reference to 'rank' is ambiguous
    if(rank[x]==rank[y])rank[y]++;
                ^
0_0_14859229_4000.cpp:22:46: note: candidates are: int rank [20005]
 int a[QueryLen],parent[NodeLen],num[NodeLen],rank[NodeLen];
                                              ^
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_14859229_4000.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_14859229_4000.cpp:49:24: error: reference to 'rank' is ambiguous
    if(rank[x]==rank[y])rank[y]++;
                        ^
0_0_14859229_4000.cpp:22:46: note: candidates are: int rank [20005]
 int a[QueryLen],parent[NodeLen],num[NodeLen],rank[NodeLen];
                                              ^
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_14859229_4000.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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