Compilare: main.cpp: In function 'std::stack<c> convexhullr(std::vector<c>)': main.cpp:81:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<c>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 81 | for(int i=2; i<p.size(); i++) { | ~^~~~~~~~~ main.cpp: In function 'std::stack<c> convexhulll(std::vector<c>)': main.cpp:93:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<c>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 93 | for(int i=2; i<p.size(); i++) { | ~^~~~~~~~~