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View Compilation Error

0_0_38495570_19871.cpp: In function 'void solve()':
0_0_38495570_19871.cpp:53:25: error: call of overloaded 'sqrt(__int128)' is ambiguous
     lll k = sqrt(r*r*3+1);
                         ^
0_0_38495570_19871.cpp:53:25: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:44:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/random:38,
                 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_38495570_19871.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:152:18: note: double sqrt(double)
   double __cdecl sqrt(double _X);
                  ^
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_38495570_19871.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:486:3: note: constexpr long double std::sqrt(long double)
   sqrt(long double __x)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:482:3: note: constexpr float std::sqrt(float)
   sqrt(float __x)
   ^
0_0_38495570_19871.cpp:58:25: error: call of overloaded 'sqrt(__int128)' is ambiguous
         k = sqrt(r*r*3+1);
                         ^
0_0_38495570_19871.cpp:58:25: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:44:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/random:38,
                 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_38495570_19871.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:152:18: note: double sqrt(double)
   double __cdecl sqrt(double _X);
                  ^
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_38495570_19871.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:486:3: note: constexpr long double std::sqrt(long double)
   sqrt(long double __x)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:482:3: note: constexpr float std::sqrt(float)
   sqrt(float __x)
   ^


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