Compilare: user.cpp: In function ‘void update(int, int)’: user.cpp:17: warning: suggest parentheses around arithmetic in operand of ‘^’ user.cpp: In function ‘int query(int)’: user.cpp:24: warning: suggest parentheses around arithmetic in operand of ‘^’ user.cpp: In function ‘void clear(int)’: user.cpp:31: warning: suggest parentheses around arithmetic in operand of ‘^’ user.cpp: In function ‘void solve()’: user.cpp:43: warning: comparison between signed and unsigned integer expressions user.cpp:53: warning: comparison between signed and unsigned integer expressions user.cpp:63: warning: comparison between signed and unsigned integer expressions user.cpp:37: warning: unused variable ‘q’ user.cpp: In function ‘void read_data()’: user.cpp:73: warning: unused variable ‘j’ user.cpp:73: warning: unused variable ‘k’ user.cpp:74: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:76: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int main()’: user.cpp:86: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:87: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result