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View Compilation Error

0_0_19021201_13373.cpp: In function 'void dfs2(int, int)':
0_0_19021201_13373.cpp:42:2: error: reference to 'rank' is ambiguous
  rank[u]=++num;
  ^
0_0_19021201_13373.cpp:9:54: note: candidates are: int rank [50010]
 int dep[MAXN],siz[MAXN],fa[MAXN],son[MAXN],top[MAXN],rank[MAXN],kth[MAXN],num,k;
                                                      ^
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++/vector:60,
                 from 0_0_19021201_13373.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_19021201_13373.cpp:43:6: error: reference to 'rank' is ambiguous
  kth[rank[u]]=u;
      ^
0_0_19021201_13373.cpp:9:54: note: candidates are: int rank [50010]
 int dep[MAXN],siz[MAXN],fa[MAXN],son[MAXN],top[MAXN],rank[MAXN],kth[MAXN],num,k;
                                                      ^
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++/vector:60,
                 from 0_0_19021201_13373.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_19021201_13373.cpp: In function 'int main()':
0_0_19021201_13373.cpp:106:10: error: reference to 'rank' is ambiguous
   memset(rank,0,sizeof rank);
          ^
0_0_19021201_13373.cpp:9:54: note: candidates are: int rank [50010]
 int dep[MAXN],siz[MAXN],fa[MAXN],son[MAXN],top[MAXN],rank[MAXN],kth[MAXN],num,k;
                                                      ^
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++/vector:60,
                 from 0_0_19021201_13373.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_19021201_13373.cpp:106:24: error: reference to 'rank' is ambiguous
   memset(rank,0,sizeof rank);
                        ^
0_0_19021201_13373.cpp:9:54: note: candidates are: int rank [50010]
 int dep[MAXN],siz[MAXN],fa[MAXN],son[MAXN],top[MAXN],rank[MAXN],kth[MAXN],num,k;
                                                      ^
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++/vector:60,
                 from 0_0_19021201_13373.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_19021201_13373.cpp:124:13: error: reference to 'rank' is ambiguous
      modify(rank[top[u]],rank[u],k,1,n,1);
             ^
0_0_19021201_13373.cpp:9:54: note: candidates are: int rank [50010]
 int dep[MAXN],siz[MAXN],fa[MAXN],son[MAXN],top[MAXN],rank[MAXN],kth[MAXN],num,k;
                                                      ^
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++/vector:60,
                 from 0_0_19021201_13373.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_19021201_13373.cpp:124:26: error: reference to 'rank' is ambiguous
      modify(rank[top[u]],rank[u],k,1,n,1);
                          ^
0_0_19021201_13373.cpp:9:54: note: candidates are: int rank [50010]
 int dep[MAXN],siz[MAXN],fa[MAXN],son[MAXN],top[MAXN],rank[MAXN],kth[MAXN],num,k;
                                                      ^
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++/vector:60,
                 from 0_0_19021201_13373.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_19021201_13373.cpp:128:12: error: reference to 'rank' is ambiguous
     modify(rank[v],rank[u],k,1,n,1);
            ^
0_0_19021201_13373.cpp:9:54: note: candidates are: int rank [50010]
 int dep[MAXN],siz[MAXN],fa[MAXN],son[MAXN],top[MAXN],rank[MAXN],kth[MAXN],num,k;
                                                      ^
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++/vector:60,
                 from 0_0_19021201_13373.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_19021201_13373.cpp:128:20: error: reference to 'rank' is ambiguous
     modify(rank[v],rank[u],k,1,n,1);
                    ^
0_0_19021201_13373.cpp:9:54: note: candidates are: int rank [50010]
 int dep[MAXN],siz[MAXN],fa[MAXN],son[MAXN],top[MAXN],rank[MAXN],kth[MAXN],num,k;
                                                      ^
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++/vector:60,
                 from 0_0_19021201_13373.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_19021201_13373.cpp:134:13: error: reference to 'rank' is ambiguous
      modify(rank[top[u]],rank[u],-k,1,n,1);
             ^
0_0_19021201_13373.cpp:9:54: note: candidates are: int rank [50010]
 int dep[MAXN],siz[MAXN],fa[MAXN],son[MAXN],top[MAXN],rank[MAXN],kth[MAXN],num,k;
                                                      ^
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++/vector:60,
                 from 0_0_19021201_13373.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_19021201_13373.cpp:134:26: error: reference to 'rank' is ambiguous
      modify(rank[top[u]],rank[u],-k,1,n,1);
                          ^
0_0_19021201_13373.cpp:9:54: note: candidates are: int rank [50010]
 int dep[MAXN],siz[MAXN],fa[MAXN],son[MAXN],top[MAXN],rank[MAXN],kth[MAXN],num,k;
                                                      ^
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++/vector:60,
                 from 0_0_19021201_13373.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_19021201_13373.cpp:138:12: error: reference to 'rank' is ambiguous
     modify(rank[v],rank[u],-k,1,n,1);
            ^
0_0_19021201_13373.cpp:9:54: note: candidates are: int rank [50010]
 int dep[MAXN],siz[MAXN],fa[MAXN],son[MAXN],top[MAXN],rank[MAXN],kth[MAXN],num,k;
                                                      ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bit


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