View Compilation Error

0_0_10092978_23024.cpp: In function `long long int f(long long int)':
0_0_10092978_23024.cpp:18: error: call of overloaded `sqrt(long double)' is ambiguous
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/math.h:157: note: candidates are: double sqrt(double)
0_0_10092978_23024.cpp:12: note:                 long double sqrt(long double)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/cmath:401: note:                 long double std::sqrt(long double)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/cmath:397: note:                 float std::sqrt(float)