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View Compilation Error

0_0_17802907_8465.cpp: In function 'void init()':
0_0_17802907_8465.cpp:21:8: error: reference to 'rank' is ambiguous
        rank[i] = 0;  
        ^
0_0_17802907_8465.cpp:13:15: note: candidates are: int rank [30000]
 int r[30000], rank[30000], a[30000];  
               ^
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_17802907_8465.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_17802907_8465.cpp: In function 'void merge(int, int)':
0_0_17802907_8465.cpp:40:8: error: reference to 'rank' is ambiguous
     if(rank[x] > rank[y]) r[y] = x;  
        ^
0_0_17802907_8465.cpp:13:15: note: candidates are: int rank [30000]
 int r[30000], rank[30000], a[30000];  
               ^
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_17802907_8465.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_17802907_8465.cpp:40:18: error: reference to 'rank' is ambiguous
     if(rank[x] > rank[y]) r[y] = x;  
                  ^
0_0_17802907_8465.cpp:13:15: note: candidates are: int rank [30000]
 int r[30000], rank[30000], a[30000];  
               ^
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_17802907_8465.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_17802907_8465.cpp:43:12: error: reference to 'rank' is ambiguous
         if(rank[x] == rank[y]) rank[x]++;  
            ^
0_0_17802907_8465.cpp:13:15: note: candidates are: int rank [30000]
 int r[30000], rank[30000], a[30000];  
               ^
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_17802907_8465.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_17802907_8465.cpp:43:23: error: reference to 'rank' is ambiguous
         if(rank[x] == rank[y]) rank[x]++;  
                       ^
0_0_17802907_8465.cpp:13:15: note: candidates are: int rank [30000]
 int r[30000], rank[30000], a[30000];  
               ^
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_17802907_8465.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_17802907_8465.cpp:43:32: error: reference to 'rank' is ambiguous
         if(rank[x] == rank[y]) rank[x]++;  
                                ^
0_0_17802907_8465.cpp:13:15: note: candidates are: int rank [30000]
 int r[30000], rank[30000], a[30000];  
               ^
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_17802907_8465.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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