Compilare: main.cpp: In function 'void convex_hull(std::vector<pt>&, bool)': main.cpp:52:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<pt>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | if (i == a.size() - 1 || cw(p1, a[i], p2, include_collinear)) { | ~~^~~~~~~~~~~~~~~ main.cpp:57:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<pt>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | if (i == a.size() - 1 || ccw(p1, a[i], p2, include_collinear)) { | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int32_t main()': main.cpp:141:38: warning: variable 'p5' set but not used [-Wunused-but-set-variable] 141 | int i5= (i3+1)%n; pt p5 = vec[i5]; | ^~ main.cpp:117:29: warning: variable 'p1' set but not used [-Wunused-but-set-variable] 117 | i3++; i3%=n; pt p1=vec[i1], p2=vec[i2], p3=vec[i3]; | ^~