Problem
A 导弹（missile）
B 插座（socket）
C 约分（frac）
D 排列（perm）

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乔斯杯红河州赛入门组

Status: Done
Rule: IOI
Problem: 4
Start at: 2024-9-28 13:00
End at: 2024-9-28 16:30
Duration: 3.5 hour(s)
Host: root
Partic.: 126