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View Compilation Error

0_0_15059358_28969.cpp: In function 'void get_dfn(int, int)':
0_0_15059358_28969.cpp:39:2: error: reference to 'rank' is ambiguous
  rank[gxx] = x;
  ^
0_0_15059358_28969.cpp:28:14: note: candidates are: int rank [200005]
 int deep[N], rank[N], dfn[N * 20], low[N * 20], dfn_clock = 0, top, n, nScc, now_num = 0;
              ^
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_15059358_28969.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_15059358_28969.cpp: In function 'void build(int, int, int)':
0_0_15059358_28969.cpp:94:43: error: reference to 'rank' is ambiguous
   tree[root].msg.push_back(make_pair(deep[rank[l]], l));
                                           ^
0_0_15059358_28969.cpp:28:14: note: candidates are: int rank [200005]
 int deep[N], rank[N], dfn[N * 20], low[N * 20], dfn_clock = 0, top, n, nScc, now_num = 0;
              ^
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_15059358_28969.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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