Compilare: main.cpp: In function 'int main()': main.cpp:50:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for(int i = 0; i<v[nd].vec.size(); i++) | ~^~~~~~~~~~~~~~~~~ main.cpp:43:9: warning: variable 'cost' set but not used [-Wunused-but-set-variable] 43 | int cost, nd; | ^~~~