Eroare de compilare: main.cpp: In function 'std::vector<std::pair<int, int> > ConvexHull(std::vector<std::pair<int, int> >)': main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < hull.size(); ++i) ~~^~~~~~~~~~~~~ main.cpp: In function 'long double Area(std::vector<std::pair<int, int> >)': main.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < p.size() - 1; ++i) ~~^~~~~~~~~~~~~~ main.cpp: In function 'int Solve(std::vector<int>, std::vector<std::pair<int, int> >)': main.cpp:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < p.size() - 1; ++i) ~~^~~~~~~~~~~~~~ main.cpp:66:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (underHull.size() != szUnderHull || aboveHull.size() != szAboveHull) ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~ main.cpp:66:61: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (underHull.size() != szUnderHull || aboveHull.size() != szAboveHull) ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:114:57: error: call of overloaded 'abs(long double)' is ambiguous long double diff = abs(area1 - area2); ^ In file included from /usr/include/c++/6/cstdlib:75:0, from /usr/include/c++/6/ext/string_conversions.h:41, from /usr/include/c++/6/bits/basic_string.h:5420, from /usr/include/c++/6/string:52, from /usr/include/c++/6/bits/locale_classes.h:40, from /usr/include/c++/6/bits/ios_base.h:41, from /usr/include/c++/6/ios:42, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, 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/ext/string_conversions.h:41:0, from /usr/include/c++/6/bits/basic_string.h:5420, from /usr/include/c++/6/string:52, from /usr/include/c++/6/bits/locale_classes.h:40, from /usr/include/c++/6/bits/ios_base.h:41, from /usr/include/c++/6/ios:42, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, 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