Compilare: user.cpp: In function ‘void Read()’: user.cpp:27:15: warning: unused variable ‘z’ [-Wunused-variable] int i,x,y,z; ^ user.cpp:29:11: warning: unused variable ‘w2’ [-Wunused-variable] edge2 w2; ^ user.cpp: In function ‘void Update(int, int, int)’: user.cpp:61:9: warning: unused variable ‘i’ [-Wunused-variable] int i,n1,n2; ^ user.cpp:62:10: warning: unused variable ‘ok’ [-Wunused-variable] bool ok; ^