Compilare: main.cpp: In member function 'int Graph::kruskal()': main.cpp:52:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | for(int i=0;i<muchii.size();i++) | ~^~~~~~~~~~~~~~