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View Compilation Error

0_0_17723420_11191.cpp: In member function 'void frac::ease()':
0_0_17723420_11191.cpp:23:19: error: call of overloaded 'abs(ll&)' is ambiguous
   ll g = gcd(abs(a), abs(b));
                   ^
0_0_17723420_11191.cpp:23:19: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:72:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_17723420_11191.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/stdlib.h:329:15: note: int abs(int)
   int __cdecl abs(int _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_17723420_11191.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:91:3: note: constexpr long double std::abs(long double)
   abs(long double __x)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:87:3: note: constexpr float std::abs(float)
   abs(float __x)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:81:3: note: constexpr double std::abs(double)
   abs(double __x)
   ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:59:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_17723420_11191.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:174:3: note: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:166:3: note: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^
0_0_17723420_11191.cpp:23:27: error: call of overloaded 'abs(ll&)' is ambiguous
   ll g = gcd(abs(a), abs(b));
                           ^
0_0_17723420_11191.cpp:23:27: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:72:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_17723420_11191.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/stdlib.h:329:15: note: int abs(int)
   int __cdecl abs(int _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_17723420_11191.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:91:3: note: constexpr long double std::abs(long double)
   abs(long double __x)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:87:3: note: constexpr float std::abs(float)
   abs(float __x)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:81:3: note: constexpr double std::abs(double)
   abs(double __x)
   ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:59:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_17723420_11191.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:174:3: note: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:166:3: note: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^


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