Eroare de compilare: main.cpp: In function 'bool operator<(const Point&, const Point&)': main.cpp:20:30: error: call of overloaded 'abs(double)' is ambiguous if (abs(a.first - b.first) > kEps) { ^ In file included from /usr/include/c++/6/cstdlib:75:0, from /usr/include/c++/6/bits/stl_algo.h:59, from /usr/include/c++/6/algorithm:62, from main.cpp:1: /usr/include/stdlib.h:774:12: note: candidate: int abs(int) extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur; ^~~ In file included from /usr/include/c++/6/bits/stl_algo.h:59:0, from /usr/include/c++/6/algorithm:62, from main.cpp:1: /usr/include/c++/6/cstdlib:180:3: note: candidate: long long int std::abs(long long int) abs(long long __x) { return __builtin_llabs (__x); } ^~~ /usr/include/c++/6/cstdlib:172:3: note: candidate: long int std::abs(long int) abs(long __i) { return __builtin_labs(__i); } ^~~ Non zero exit status: 1