View Compilation Error

0_0_32960506_182.cpp: In function '__int128 get(__int128)':
0_0_32960506_182.cpp:7:31: error: call of overloaded 'pow(__int128, int)' is ambiguous
  return pow(n * (n + 1) / 2, 2);
                               ^
0_0_32960506_182.cpp:7:31: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:44:0,
                 from 0_0_32960506_182.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:151:18: note: double pow(double, double)
   double __cdecl pow(double _X,double _Y);
                  ^
In file included from 0_0_32960506_182.cpp:2:0:
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:407:3: note: constexpr float std::pow(float, float)
   pow(float __x, float __y)
   ^