Compilare: main.cpp: In function 'void prim(int)': main.cpp:59:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<varf>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | for(i=0;i<G[vfmin].size();i++) | ~^~~~~~~~~~~~~~~~ main.cpp:65:37: warning: 'vfmin' may be used uninitialized [-Wmaybe-uninitialized] 65 | prec[G[vfmin][i].vf]=vfmin; | ~~~~~~~~~~~~~~~~~~~~^~~~~~ main.cpp:39:25: note: 'vfmin' was declared here 39 | int x, i, j, minim, vfmin; | ^~~~~