Compilare: main.cpp: In function 'void print_convex_hull()': main.cpp:106:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<point>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 106 | for (int i = 0; i < stiva.size(); i ++) | ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:133:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<point>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 133 | for (int i = 0; i < stiva.size(); i ++) | ~~^~~~~~~~~~~~~~ main.cpp:153:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<point>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 153 | for (int j = 0; j < stiva.size(); j ++) | ~~^~~~~~~~~~~~~~ main.cpp: In function 'long long int cross_prod(point, point, point)': main.cpp:40:1: warning: control reaches end of non-void function [-Wreturn-type] 40 | } | ^