Compilare: main.cpp: In function 'int main()': main.cpp:103:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<point>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 103 | for (int i = 0; i < stiva.size(); i ++) | ~~^~~~~~~~~~~~~~ main.cpp: In function 'int cross_prod(point, point, point)': main.cpp:39:1: warning: control reaches end of non-void function [-Wreturn-type] 39 | } | ^