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View Compilation Error

0_0_30411898_7178.cpp: In function 'void build(int)':
0_0_30411898_7178.cpp:43:21: error: no matching function for call to 'pow(int, int, int)'
     len=pow(n*20,0,5);num=n/len;
                     ^
0_0_30411898_7178.cpp:43:21: note: candidates are:
In file included from 0_0_30411898_7178.cpp:7:0:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:151:18: note: double pow(double, double)
   double __cdecl pow(double _X,double _Y);
                  ^
GCC4.9.2/x86_64-w64-mingw32/include/math.h:151:18: note:   candidate expects 2 arguments, 3 provided
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/random:38:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:66,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_30411898_7178.cpp:11:
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:434:5: note: template<class _Tp, class _Up> constexpr typename __gnu_cxx::__promote_2<_Tp, _Up>::__type std::pow(_Tp, _Up)
     pow(_Tp __x, _Up __y)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:434:5: note:   template argument deduction/substitution failed:
0_0_30411898_7178.cpp:43:21: note:   candidate expects 2 arguments, 3 provided
     len=pow(n*20,0,5);num=n/len;
                     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/random:38:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:66,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_30411898_7178.cpp:11:
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:411:3: note: constexpr long double std::pow(long double, long double)
   pow(long double __x, long double __y)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:411:3: note:   candidate expects 2 arguments, 3 provided
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:407:3: note: constexpr float std::pow(float, float)
   pow(float __x, float __y)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:407:3: note:   candidate expects 2 arguments, 3 provided


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