Problem
A 序列重排（arrange）
B 划分（partition）
C 蛋糕（cake）
D 矩阵（matrix）

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10月30日考前练习赛

Status: Done
Rule: OI
Problem: 4
Start at: 2025-10-30 15:00
End at: 2025-10-31 0:00
Duration: 9 hour(s)
Host: 张老师
Partic.: 9