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

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龙凤苑中学有基础训练12.18

Status: Done
Rule: OI
Problem: 4
Start at: 2025-12-18 17:00
End at: 2025-12-18 18:30
Duration: 1.5 hour(s)
Host: 管理员Ter (admin)
Partic.: 24