21点21点\u0032\u0031\u70B9 (C99)\U000032\U000031\U0070B9 (C99)\u{32}\u{31}\u{70B9} (C++23)\U00000032\U00000031\U000070B9\u0032\u0031\u70B9\u0032\u0031\u70B9\u{32}\u{31}\u{70B9}\u0032\u0031\u70B9\32\31\70B9\000032\000031\0070B9=32=31=E7=82=B9%32%31%E7%82%B9