Compilare: main.cpp: In function 'bool convex(std::vector<Punct>&)': main.cpp:39:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == v.size() - 1) ~~^~~~~~~~~~~~~~~ main.cpp:45:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < st.size(); ++i) ~~^~~~~~~~~~~ main.cpp: In function 'long long int area(const std::vector<Punct>&)': main.cpp:56:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size()-1; ++i) ~~^~~~~~~~~~~~