Eroare de compilare: user.cpp: In function ‘double arie(std::pair<int, int>, std::pair<int, int>, std::pair<int, int>)’: user.cpp:13: error: call of overloaded ‘abs(double)’ is ambiguous /usr/include/stdlib.h:766: note: candidates are: int abs(int) /usr/include/c++/4.4/cstdlib:170: note: long long int __gnu_cxx::abs(long long int) /usr/include/c++/4.4/cstdlib:139: note: long int std::abs(long int) user.cpp: In function ‘int main()’: user.cpp:19: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:20: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result