Compilare: main.cpp: In function 'void read()': main.cpp:44:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for (int j = 0, c = 1; j < s.size(); ++j, c *= 5) { | ~~^~~~~~~~~~ main.cpp: In function 'void Kruskal()': main.cpp:79:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, std::pair<int, int> > > >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 79 | for (int i = 0; i < g.size(); ++i) { | ~~^~~~~~~~~~