Compilare: user.cpp: In function ‘void update(int, int)’: user.cpp:101: warning: suggest parentheses around arithmetic in operand of ‘^’ user.cpp: In function ‘int query(int)’: user.cpp:108: warning: suggest parentheses around arithmetic in operand of ‘^’ user.cpp: In function ‘void clear(int)’: user.cpp:115: warning: suggest parentheses around arithmetic in operand of ‘^’ user.cpp: In function ‘void solve()’: user.cpp:127: warning: comparison between signed and unsigned integer expressions user.cpp:137: warning: comparison between signed and unsigned integer expressions user.cpp:147: warning: comparison between signed and unsigned integer expressions user.cpp:121: warning: unused variable ‘q’ user.cpp: In function ‘void read_data()’: user.cpp:157: warning: unused variable ‘j’ user.cpp:157: warning: unused variable ‘k’ user.cpp:158: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:160: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int main()’: user.cpp:170: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:171: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result