Compilare: user.cpp: In function ‘int apm_kruskal()’: user.cpp:52:9: warning: unused variable ‘nr’ [-Wunused-variable] int nr=0,i,val=0,j,root1,root2,used=1,nod; ^ user.cpp:52:24: warning: unused variable ‘root1’ [-Wunused-variable] int nr=0,i,val=0,j,root1,root2,used=1,nod; ^ user.cpp:52:30: warning: unused variable ‘root2’ [-Wunused-variable] int nr=0,i,val=0,j,root1,root2,used=1,nod; ^ user.cpp: In function ‘void solve()’: user.cpp:106:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.cpp:106:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^