Compilare: main.cpp: In function 'void Solve()': main.cpp:22:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for(int i = 0;i < v.size(); ++i) | ~~^~~~~~~~~~ main.cpp:36:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | for(int i = 0;i < pre.size(); ++i) Hull.add(pre[i]); | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:51:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for(int i = 0;i < Hull.size(); ++i, cout << Hull[i-1].first << ' ' << Hull[i-1].second << '\n'); | ~~^~~~~~~~~~~~~