Compilare: main.cpp: In function 'void prim(int)': main.cpp:64:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<varf>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | for (i=0; i<G[start].size(); i++) | ~^~~~~~~~~~~~~~~~ main.cpp:79:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<varf>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 79 | for (i=0; i<G[vfmin].size(); i++) | ~^~~~~~~~~~~~~~~~