Compilare: main.cpp: In function 'int main()': main.cpp:96:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 96 | for (int i = 0; i < hull.size(); i++) { | ~~^~~~~~~~~~~~~ main.cpp:113:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 113 | for (int i = 2; i < hull.size(); ++i) | ~~^~~~~~~~~~~~~ main.cpp:119:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 119 | for (int i = 0; i < hull.size(); ++i) { | ~~^~~~~~~~~~~~~ main.cpp:130:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 130 | for (int i = 1; i < hull.size(); ++i) { | ~~^~~~~~~~~~~~~