Compilare: main.cpp: In function 'int df(int, int)': main.cpp:25:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for (int i = 0; i < l[vf].size(); i++) | ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:57:6: warning: 'mij' may be used uninitialized in this function [-Wmaybe-uninitialized] 57 | g << mij; | ^~~