biperm.cpp: In function `std::vector<PII, std::allocator<PII> > Go(int, int, int)': biperm.cpp:129: call of overloaded `fabs(int&)' is ambiguous /usr/include/bits/mathinline.h:445: candidates are: double fabs(double) /usr/include/c++/3.2.2/cmath:243: long double std::fabs(long double) /usr/include/c++/3.2.2/cmath:239: float std::fabs(float) biperm.cpp:129: call of overloaded `fabs(int&)' is ambiguous /usr/include/bits/mathinline.h:445: candidates are: double fabs(double) /usr/include/c++/3.2.2/cmath:243: long double std::fabs(long double) /usr/include/c++/3.2.2/cmath:239: float std::fabs(float)