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View Compilation Error

0_0_15187968_10281.cpp: In function 'void deal()':
0_0_15187968_10281.cpp:22:31: error: reference to 'rank' is ambiguous
   (Ans+=Mul(Mul(pow2[i-1]-cnt[rank(a[i])],pow2[n-i]),a[i])) %= MO;
                               ^
0_0_15187968_10281.cpp:3:21: note: in definition of macro 'Mul'
 #define Mul(a,b) (((a)%(MO))*((b)%(MO)))%MO
                     ^
0_0_15187968_10281.cpp:22:13: note: in expansion of macro 'Mul'
   (Ans+=Mul(Mul(pow2[i-1]-cnt[rank(a[i])],pow2[n-i]),a[i])) %= MO;
             ^
0_0_15187968_10281.cpp:10:12: note: candidates are: int rank(int)
 int inline rank(int x){
            ^
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_15187968_10281.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_15187968_10281.cpp:23:8: error: reference to 'rank' is ambiguous
   (cnt[rank(a[i])]+=pow2[i-1]) %= MO;
        ^
0_0_15187968_10281.cpp:10:12: note: candidates are: int rank(int)
 int inline rank(int x){
            ^
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_15187968_10281.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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