Compilare: main.cpp: In function 'void kruskal()': main.cpp:49:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for (int i = 0; i < graf.size(); ++i) | ~~^~~~~~~~~~~~~ main.cpp: In function 'void kruskal2(int, int)': main.cpp:63:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | for (int i = 0; i < apm.size(); ++i) | ~~^~~~~~~~~~~~