Compilare: user.cpp: In function ‘void Read()’: user.cpp:26:15: warning: unused variable ‘z’ [-Wunused-variable] int i,x,y,z; ^ user.cpp:28:11: warning: unused variable ‘w2’ [-Wunused-variable] edge2 w2; ^ user.cpp: In function ‘void Update(int, int, int)’: user.cpp:59:9: warning: unused variable ‘i’ [-Wunused-variable] int i,n1,n2; ^ user.cpp:60:10: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] bool ok; ^