Eroare de compilare: user.cpp: In function `bool operator<(const pos&, const pos&)': user.cpp:25: error: call of overloaded `abs(double)' is ambiguous /usr/include/stdlib.h:748: error: candidates are: int abs(int) user.cpp:15: error: double abs(double) /usr/include/c++/3.3/cmath:180: error: long double std::abs(long double) /usr/include/c++/3.3/cmath:176: error: float std::abs(float) /usr/include/c++/3.3/cmath:172: error: double std::abs(double) /usr/include/c++/3.3/cstdlib:149: error: long long int __gnu_cxx::abs(long long int) /usr/include/c++/3.3/cstdlib:119: error: long int std::abs(long int) user.cpp: In function `int main()': user.cpp:70: error: call of overloaded `abs(double)' is ambiguous /usr/include/stdlib.h:748: error: candidates are: int abs(int) user.cpp:15: error: double abs(double) /usr/include/c++/3.3/cmath:180: error: long double std::abs(long double) /usr/include/c++/3.3/cmath:176: error: float std::abs(float) /usr/include/c++/3.3/cmath:172: error: double std::abs(double) /usr/include/c++/3.3/cstdlib:149: error: long long int __gnu_cxx::abs(long long int) /usr/include/c++/3.3/cstdlib:119: error: long int std::abs(long int) user.cpp:70: error: call of overloaded `abs(double)' is ambiguous