Compilare: main.cpp: In function 'int lowhull()': main.cpp:33:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for (int i = 0; i < aux.size(); i++) | ~~^~~~~~~~~~~~ main.cpp: In function 'int uphull()': main.cpp:51:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for (int i = 0; i < aux.size(); i++) | ~~^~~~~~~~~~~~