Compilare: main.cpp: In function 'void dfs(long long int)': main.cpp:39:24: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for ( int i = 0; i < fii.size(); i++ ) { | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:46:23: warning: unused variable 'st' [-Wunused-variable] 46 | int n, i, parent, st, dr; | ^~ main.cpp:46:27: warning: unused variable 'dr' [-Wunused-variable] 46 | int n, i, parent, st, dr; | ^~