19点19点\u0031\u0039\u70B9 (C99)\U000031\U000039\U0070B9 (C99)\u{31}\u{39}\u{70B9} (C++23)\U00000031\U00000039\U000070B9\u0031\u0039\u70B9\u0031\u0039\u70B9\u{31}\u{39}\u{70B9}\u0031\u0039\u70B9\31\39\70B9\000031\000039\0070B9=31=39=E7=82=B9%31%39%E7%82%B9