Compilare: main.cpp: In function 'std::vector<std::array<int, 3> > prim(int, const std::vector<std::vector<std::pair<int, int> > >&, int&)': main.cpp:37:38: warning: comparison of integer expressions of different signedness: 'std::vector<std::array<int, 3> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 37 | while (!pq.empty() && mst.size() < nodes - 1) { | ~~~~~~~~~~~^~~~~~~~~~~ main.cpp:56:20: warning: comparison of integer expressions of different signedness: 'std::vector<std::array<int, 3> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 56 | if (mst.size() != nodes - 1) { | ~~~~~~~~~~~^~~~~~~~~~~~