Compilare: main.cpp: In function 'int main()': main.cpp:103:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 103 | for (int i = 1; i < poli.size() - 1; i++) | ~~^~~~~~~~~~~~~~~~~ main.cpp:105:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 105 | for (int j = i; j < poli.size() - 1; j++) | ~~^~~~~~~~~~~~~~~~~