Compilare: main.cpp: In function 'void dfs(int)': main.cpp:36:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | for ( int i = 0; i < fii.size(); i++ ) { | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:43:23: warning: unused variable 'st' [-Wunused-variable] 43 | int n, i, parent, st, dr; | ^~ main.cpp:43:27: warning: unused variable 'dr' [-Wunused-variable] 43 | int n, i, parent, st, dr; | ^~