Compilare: main.cpp: In function 'void prim()': main.cpp:81:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<varf>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 81 | for(i=0; i<G[start].size(); i++) | ~^~~~~~~~~~~~~~~~ main.cpp:96:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<varf>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 96 | for(j=0; j<G[vf].size(); j++) | ~^~~~~~~~~~~~~ main.cpp:74:13: warning: unused variable 'x' [-Wunused-variable] 74 | int i,j,x,vf; | ^