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View Compilation Error

0_0_20625960_3832.cpp: In function 'void dfs2(int, int)':
0_0_20625960_3832.cpp:81:2: error: reference to 'rank' is ambiguous
  rank[now]=++tot;
  ^
0_0_20625960_3832.cpp:16:5: note: candidates are: int rank [404000]
 int rank[N*4];
     ^
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_20625960_3832.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_20625960_3832.cpp: In function 'void change(int, int, int)':
0_0_20625960_3832.cpp:96:10: error: reference to 'rank' is ambiguous
   update(rank[a]+1,-c);
          ^
0_0_20625960_3832.cpp:16:5: note: candidates are: int rank [404000]
 int rank[N*4];
     ^
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_20625960_3832.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_20625960_3832.cpp:97:10: error: reference to 'rank' is ambiguous
   update(rank[top[a]],c);
          ^
0_0_20625960_3832.cpp:16:5: note: candidates are: int rank [404000]
 int rank[N*4];
     ^
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_20625960_3832.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_20625960_3832.cpp:103:9: error: reference to 'rank' is ambiguous
  update(rank[a]+1,-c);
         ^
0_0_20625960_3832.cpp:16:5: note: candidates are: int rank [404000]
 int rank[N*4];
     ^
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_20625960_3832.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_20625960_3832.cpp:104:9: error: reference to 'rank' is ambiguous
  update(rank[b],c);
         ^
0_0_20625960_3832.cpp:16:5: note: candidates are: int rank [404000]
 int rank[N*4];
     ^
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_20625960_3832.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_20625960_3832.cpp: In function 'int main()':
0_0_20625960_3832.cpp:135:11: error: reference to 'rank' is ambiguous
    update(rank[i],A[i]);
           ^
0_0_20625960_3832.cpp:16:5: note: candidates are: int rank [404000]
 int rank[N*4];
     ^
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_20625960_3832.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_20625960_3832.cpp:136:11: error: reference to 'rank' is ambiguous
    update(rank[i]+1,-A[i]);
           ^
0_0_20625960_3832.cpp:16:5: note: candidates are: int rank [404000]
 int rank[N*4];
     ^
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_20625960_3832.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_20625960_3832.cpp:159:26: error: reference to 'rank' is ambiguous
     printf("%d\n",getnum(rank[a]));
                          ^
0_0_20625960_3832.cpp:16:5: note: candidates are: int rank [404000]
 int rank[N*4];
     ^
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_20625960_3832.cpp:4:
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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