Compilare: user.cpp: In function ‘void build(int, int, int)’: user.cpp:22:17: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] int mid = l + r >> 1; ^ user.cpp: In function ‘void upd(int, int, int, int, int)’: user.cpp:35:17: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] int mid = l + r >> 1; ^ user.cpp: In function ‘int kth(int, int, int, int)’: user.cpp:45:17: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] int mid = l + r >> 1; ^ user.cpp: In function ‘int32_t main()’: user.cpp:51:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("order.in","r",stdin); ^ user.cpp:52:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("order.out","w",stdout); ^