Compilare: user.cpp: In function ‘void normalize()’: user.cpp:25: warning: unused variable ‘v’ user.cpp: In function ‘int query(int)’: user.cpp:41: warning: suggest parentheses around arithmetic in operand of ‘^’ user.cpp: In function ‘void update(int, int)’: user.cpp:53: warning: suggest parentheses around arithmetic in operand of ‘^’