Problem
A David与阶乘
B Evensgn与字符矩阵
C Vincent与游戏
D 异或 xor

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10.23

Status: Done
Rule: OI
Problem: 4
Start at: 2023-10-23 18:40
End at: 2023-10-23 20:20
Duration: 1.7 hour(s)
Host: Hydro
Partic.: 1