Compilare: main.cpp: In function 'void df(int)': main.cpp:18:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for (i = 0; i < l[vf].size(); i++) | ~~^~~~~~~~~~~~~~ main.cpp: In function 'void elim_frunze()': main.cpp:44:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for (k = 0; k < l[i].size(); k++) | ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:51:15: warning: unused variable 'k' [-Wunused-variable] 51 | {int t, i, j, k, x, y, m; | ^