Problem
A 加法
B 打印锯齿矩阵
C 「一本通 1.1 例 1」活动安排
D 墙壁涂色

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周六下午测试

Status: Done
Rule: IOI
Problem: 4
Start at: 2026-9-26 15:30
End at: 2026-9-26 17:30
Duration: 2 hour(s)
Host: jack
Partic.: 2