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View Compilation Error

0_0_24359396_131.cpp: In function '__int128 shrinkToLeast(const __int128&)':
0_0_24359396_131.cpp:29:28: error: call of overloaded 'sqrt(__int128&)' is ambiguous
     __int128 r = sqrt(value);
                            ^
0_0_24359396_131.cpp:29:28: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:44:0,
                 from 0_0_24359396_131.cpp:2:
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 0_0_24359396_131.cpp:2:0:
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_24359396_131.cpp: In function 'int main()':
0_0_24359396_131.cpp:86:22: error: cannot convert 'std::string {aka std::basic_string<char>}' to '__int128' in initialization
         __int128 a(na), b(nb), c(gcd(a, b));
                      ^
0_0_24359396_131.cpp:86:29: error: cannot convert 'std::string {aka std::basic_string<char>}' to '__int128' in initialization
         __int128 a(na), b(nb), c(gcd(a, b));
                             ^


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