Compilare: main.cpp: In function 'std::vector<Point> upper_hull(const std::vector<Point>&)': main.cpp:18:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Point>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i = 2; i < v.size(); i++){ | ~~^~~~~~~~~~ main.cpp:19:50: warning: comparison of constant '0' with boolean expression is always false [-Wbool-compare] 19 | while(convex(S[last - 1], S[last], v[i]) < 0) | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~ main.cpp: In function 'std::vector<Point> lower_hull(const std::vector<Point>&)': main.cpp:29:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Point>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for(int i = 2; i < v.size(); i++){ | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:57:21: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' 57 | const auto& [x, y] = lower[i]; | ^ main.cpp:61:21: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' 61 | const auto& [x, y] = upper[i]; | ^