Compilare: main.cpp: In function 'int main()': main.cpp:30:33: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int>, std::allocator<std::pair<long long int, long long int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for(long long i=0; i<mu[nod].size(); i++) | ~^~~~~~~~~~~~~~~