Compilare: user.cpp: In function ‘void Prim(int, int, std::vector<std::pair<int, int> >*, std::vector<muchie>&)’: user.cpp:72:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<la[s].size();i++) ~^~~~~~~~~~~~~ user.cpp:88:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<la[mcurr.vf].size();i++) ~^~~~~~~~~~~~~~~~~~~~ user.cpp:55:25: warning: unused variable ‘i’ [-Wunused-variable] int u, *tata, *viz,i,v; ^ user.cpp:55:27: warning: unused variable ‘v’ [-Wunused-variable] int u, *tata, *viz,i,v; ^ user.cpp:56:12: warning: unused variable ‘cost_muchie’ [-Wunused-variable] int *d,cost_muchie; ^~~~~~~~~~~