Compilare: user.cpp: In function ‘int main()’: user.cpp:41:9: warning: unused variable ‘v’ [-Wunused-variable] int v,e,source,x,m,n,k,first,second,weight; ^ user.cpp:41:11: warning: unused variable ‘e’ [-Wunused-variable] int v,e,source,x,m,n,k,first,second,weight; ^ user.cpp:41:13: warning: unused variable ‘source’ [-Wunused-variable] int v,e,source,x,m,n,k,first,second,weight; ^