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View Compilation Error

0_0_39172172_22752.cpp: In function 'int rank(int, int)':
0_0_39172172_22752.cpp:160:31: error: reference to 'rank' is ambiguous
  160 |         if(v < val[p]) return rank(ch[p][0],v);
      |                               ^~~~
In file included from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/move.h:57,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/exception_ptr.h:41,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/exception:164,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/ios:41,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/ostream:40,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/iostream:41,
                 from 0_0_39172172_22752.cpp:1:
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/type_traits:1356:12: note: candidates are: 'template<class> struct std::rank'
 1356 |     struct rank
      |            ^~~~
0_0_39172172_22752.cpp:156:5: note:                 'int rank(int, int)'
  156 | int rank(int p,int v)
      |     ^~~~
0_0_39172172_22752.cpp:161:21: error: reference to 'rank' is ambiguous
  161 |         else return rank(ch[p][1],v)+siz[ch[p][0]]+num[p];
      |                     ^~~~
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/type_traits:1356:12: note: candidates are: 'template<class> struct std::rank'
 1356 |     struct rank
      |            ^~~~
0_0_39172172_22752.cpp:156:5: note:                 'int rank(int, int)'
  156 | int rank(int p,int v)
      |     ^~~~
0_0_39172172_22752.cpp: In function 'int main()':
0_0_39172172_22752.cpp:186:33: error: reference to 'rank' is ambiguous
  186 |                         int k = rank(root,b);
      |                                 ^~~~
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/type_traits:1356:12: note: candidates are: 'template<class> struct std::rank'
 1356 |     struct rank
      |            ^~~~
0_0_39172172_22752.cpp:156:5: note:                 'int rank(int, int)'
  156 | int rank(int p,int v)
      |     ^~~~


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