Compilare: main.cpp: In function 'int df(int)': main.cpp:25:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for (i = 0; i < l[vf].size(); i++) | ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:41:6: warning: unused variable 'e' [-Wunused-variable] 41 | {int e, flux = 0, i, j, in, out, mn; | ^