Compilare: main.cpp: In function 'int main()': main.cpp:42:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for (int i = 0; i < D[pos].size(); i += 2) | ~~^~~~~~~~~~~~~~~