Problem
A 优美数对
B 百合花数
C 勇者斗恶龙
D 购买

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Status: Done
Rule: IOI
Problem: 4
Start at: 2025-11-28 8:20
End at: 2025-11-28 11:41
Duration: 3.4 hour(s)
Host: kcs007
Partic.: 16